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Artykuły w czasopismach na temat „Low latitude current systems”

Autor: Grafiati

Data publikacji: 6 września 2023

Data aktualizacji: 31 lipca 2025

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1

Tinsley, B. A., R. Rohrbaugh, H. Rassoul, Y. Sahai, N. R. Teixeira, and D. Slater. "Low-latitude aurorae and storm time current systems." Journal of Geophysical Research 91, A10 (1986): 11257. http://dx.doi.org/10.1029/ja091ia10p11257.

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Saka, O., J. S. Kim, and D. J. Knecht. "Ionospheric equivalent current systems of low-latitude Pc3 pulsations." Planetary and Space Science 36, no. 7 (1988): 641–53. http://dx.doi.org/10.1016/0032-0633(88)90112-2.

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3

Liu, Ping, Chun Ming Liu, and Lian Guang Liu. "Variation Characteristics of Geoelectric Field in Mid-to-Low Latitude Area during Geomagnetic Storms." Advanced Materials Research 1008-1009 (August 2014): 524–29. http://dx.doi.org/10.4028/www.scientific.net/amr.1008-1009.524.

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Large geoelectric field generated in the ground during severe space weather events are sources of geomagnetically induced currents (GICs), which flow in power systems potentially causing damage to system component or failure of the system. In this paper, based on the H and D components of the recent geomagnetic storm data measured at 10 mid-to-low latitude geomagnetic observatories, we analyzed the variation characteristics of the amplitude of north-south and east-west geoelectric components with geographic latitudes. Furthermore, we discussed the possibilities of GIC problem occurrence in tra

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4

Grafe, A., P. A. Bespalov, V. Y. Trakhtengerts, and A. G. Demekhov. "Afternoon mid-latitude current system and low-latitude geomagnetic field asymmetry during geomagnetic storms." Annales Geophysicae 15, no. 12 (1997): 1537–47. http://dx.doi.org/10.1007/s00585-997-1537-5.

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Abstract. For four geomagnetic storms of middle intensity the relationship between the low-latitude magnetic field asymmetry using ASY indices and the intensity of the auroral eastward and westward electrojet was considered. It was asked whether there exists a connection between ASY and the eastward electrojet. To answer this question equivalent current systems were estimated in mid-latitudes. It was found that the observations obviously show no correlative relationship between the low-latitude magnetic-field asymmetry and the eastward electrojet, whereas one exists between ASY and the westwar

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5

Barkhatov, N. A., S. E. Revunov, O. T. Cherney, M. V. Mukhina, and Zh V. Smirnova. "Neural networks technique for detecting current systems while main phase of geomagnetic storm." E3S Web of Conferences 220 (2020): 01091. http://dx.doi.org/10.1051/e3sconf/202022001091.

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The study demonstrated the technology for searching nonlinear correlations between the intensity indices of auroral electric jets (AU, AL) and ring current intensity indices (SYM, ASY). The well-known connection of the western electrojet with the asymmetric part of the ring current and the eastern electrodett with the symmetric is confirmed. The technology of artificial neural networks was chosen as the main method. Thus, the relationship of magnetic disturbances in the auroral region and magnetic disturbances at middle and low latitudes in the main phase of a geomagnetic storm is investigated

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6

Belenkaya, E. S., I. I. Alexeev, and C. R. Clauer. "Magnetic field of the transition current system: dawn-dusk asymmetry." Annales Geophysicae 25, no. 8 (2007): 1899–911. http://dx.doi.org/10.5194/angeo-25-1899-2007.

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Abstract. In this paper we consider the interactions of coronal mass ejections (CMEs) with the Earth's magnetosphere for the specific case in which there is a sharp increase in the dynamic pressure (interplanetary shock) that is associated with a simultaneous northward turning of the interplanetary magnetic field (IMF) from the near horizontal direction. Previously, we have shown that under such circumstances, the so-called transition current systems arise. These temporary high-latitude current systems create a low-latitude asymmetric magnetic field on the ground with a large northward field e

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7

Lovati, Giulia, Paola De Michelis, Giuseppe Consolini, and Francesco Berrilli. "Pressure-Gradient Current at High Latitude from Swarm Measurements." Remote Sensing 14, no. 6 (2022): 1428. http://dx.doi.org/10.3390/rs14061428.

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The pressure-gradient current is among the weaker ionospheric current systems arising from plasma pressure variations. It is also called diamagnetic current because it produces a magnetic field which is oriented oppositely to the ambient magnetic field, causing its reduction. The magnetic reduction can be revealed in measurements made by low-Earth orbiting satellites flying close to ionospheric plasma regions where rapid changes in density occur. Using geomagnetic field, plasma density and electron temperature measurements recorded on board ESA Swarm A satellite from April 2014 to March 2018,

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8

Yang, Lucy, Nyree Zerega, Anastasia Montgomery, and Daniel E. Horton. "Potential of breadfruit cultivation to contribute to climate-resilient low latitude food systems." PLOS Climate 1, no. 8 (2022): e0000062. http://dx.doi.org/10.1371/journal.pclm.0000062.

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The number of people in food crisis around the world is increasing, exacerbated by COVID-19, conflict, and climate change. Major crop yields are projected to decrease in low-latitude regions, making tropical and sub-tropical food systems particularly vulnerable. Increased cultivation of breadfruit (Artocarpus altilis), a neglected and underutilized species (NUS), has the potential to enhance climate resilience and overall sustainability of low-latitude agricultural systems. To better understand breadfruit’s cultivation suitability and geographic range in current and future climates, we use bre

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9

Spall, Michael A., and David Nieves. "Wind-Forced Variability of the Remote Meridional Overturning Circulation." Journal of Physical Oceanography 50, no. 2 (2020): 455–69. http://dx.doi.org/10.1175/jpo-d-19-0190.1.

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AbstractThe mechanisms by which time-dependent wind stress anomalies at midlatitudes can force variability in the meridional overturning circulation at low latitudes are explored. It is shown that winds are effective at forcing remote variability in the overturning circulation when forcing periods are near the midlatitude baroclinic Rossby wave basin-crossing time. Remote overturning is required by an imbalance in the midlatitude mass storage and release resulting from the dependence of the Rossby wave phase speed on latitude. A heuristic theory is developed that predicts the strength and freq

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10

Clilverd, Mark A., Craig J. Rodger, Sarah Dietrich, et al. "High-latitude geomagnetically induced current events observed on very low frequency radio wave receiver systems." Radio Science 45, no. 2 (2010): n/a. http://dx.doi.org/10.1029/2009rs004215.

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11

Wang, H., H. Lühr, S. Y. Ma, and P. Ritter. "Statistical study of the substorm onset: its dependence on solar wind parameters and solar illumination." Annales Geophysicae 23, no. 6 (2005): 2069–79. http://dx.doi.org/10.5194/angeo-23-2069-2005.

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Abstract. Based on 1829 well-defined substorm onsets in the Northern Hemisphere, observed during a 2-year period by the FUV Imager on board the IMAGE spacecraft, a statistical study is performed. From the combination of solar wind parameter observations by ACE and magnetic field observations by the low altitude satellite CHAMP, the location of auroral breakups in response to solar illumination and solar coupling parameters are studied. Furthermore, the correspondence of the onset location with prominent large-scale field-aligned currents and electrojets are investigated. Solar illumination and

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12

Grafe, A. "Are our ideas about <i>Dst</i> correct?" Annales Geophysicae 17, no. 1 (1999): 1–10. http://dx.doi.org/10.1007/s00585-999-0001-0.

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Abstract. The idea of two separate storm time ring currents, a symmetric and an asymmetric one has accepted since the 1960s. The existence of a symmetric equatorial ring current was concluded from Dst. However, the asymmetric development of the low-latitude geomagnetic disturbance field during storms lead to the assumption of the real existence of an asymmetric ring current. I think it is time to inquire whether this conception is correct. Thus, I have investigated the development of the low-latitude geomagnetic field during all the magnetic local times under disturbed and quiet conditions. Th

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13

Kakad, Bharati, and Amar Kakad. "Characteristics of probability distribution functions of low- and high-latitude current systems during Solar Cycle 24." Advances in Space Research 65, no. 6 (2020): 1559–67. http://dx.doi.org/10.1016/j.asr.2019.12.021.

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14

Farah, Ashraf. "Single-Frequency Ionospheric-Delay Correction from BeiDou & GPS Systems for Northern Hemisphere." Artificial Satellites 54, no. 1 (2019): 1–15. http://dx.doi.org/10.2478/arsa-2019-0002.

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Abstract The range delay caused by the ionosphere layer is the major current source of error for GNSS users with single-frequency receivers. GNSS advice users to correct this type of error using ionospheric models whose coefficients are sent in their navigation messages. GPS-users use the Klobuchar model to correct this type of error. GPS navigation message contains the model’s eight coefficients which vary on the basis of seasonal ionospheric variations and average solar flux. The correction accuracy of Klobuchar model is about 50% (rms) of the ionospheric range delay. Beidou system calculate

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15

Wu, Wei Li. "Study on Magnetic Materials with Numerical Calculation of Geoelectromagnetic Field in Middle-Low Latitude Region." Advanced Materials Research 738 (August 2013): 303–6. http://dx.doi.org/10.4028/www.scientific.net/amr.738.303.

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This paper expounds mechanism of the interact between the vary ionosphere currents and the Earth as a magnetic materials during magnetic storms which create the geoelectromagnetic fields on the Earths surface. Cauchy Distribution model of ionosphere currents above the middle-low latitude area is built for calculation of the fields. In order to predict and evaluate the levels of GIC flowing in technology systems,Complex Image Method (CIM) is applied to calculate geo-electric-magnetic fields on the Earths surface of the middle-low latitude. To test veracity,we compare calculation of the electrom

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16

Schram, JB, HL Sorensen, RD Brodeur, AWE Galloway, and KR Sutherland. "Abundance, distribution, and feeding ecology of Pyrosoma atlanticum in the Northern California Current." Marine Ecology Progress Series 651 (October 1, 2020): 97–110. http://dx.doi.org/10.3354/meps13465.

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During 2016-2018, unprecedented aggregations of the colonial pelagic tunicate Pyrosoma atlanticum were observed in the Northern California Current (NCC). Pyrosomes are common in tropical and sub-tropical ocean waters, but little is known about their abundance, distribution, and trophic ecology in mid-latitude systems. To assess these factors, pyrosomes were collected during cruises in the NCC in May and August 2017. A generalized additive model (GAM) was used to identify relationships between in situ environmental variables (temperature, salinity, fluorescence) and distribution and abundance p

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17

Zhao, Xudong, Yufei He, Yingyan Wu, and Qi Li. "Equivalent Current Systems of Quiet Ionosphere during the 24th Solar Cycle Derived from the Geomagnetic Records in China." Atmosphere 13, no. 11 (2022): 1843. http://dx.doi.org/10.3390/atmos13111843.

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External and internal equivalent current systems of solar quiet (Sq) were obtained using the spherical harmonic analysis (SHA) method with a “mirror” technique based on geomagnetic records from 46 stations in China during 2008–2019. It is the first attempt to investigate Sq currents using so many stations in the China region for a long period. On the basis of criterion Kp ≤ 2+, geomagnetic vector data were selected to represent monthly Sq variations. After calculating the equivalent currents for each month and each Lloyd season, Sq variation was analyzed in relation to the solar cycle and seas

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18

Cravatte, S., Elodie Kestenare, Frédéric Marin, Pierre Dutrieux, and Eric Firing. "Subthermocline and Intermediate Zonal Currents in the Tropical Pacific Ocean: Paths and Vertical Structure." Journal of Physical Oceanography 47, no. 9 (2017): 2305–24. http://dx.doi.org/10.1175/jpo-d-17-0043.1.

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AbstractThe mean subthermocline and intermediate zonal circulation in the tropical Pacific is investigated using a compilation of shipboard ADCP measurements and absolute geostrophic velocities constructed from a high-resolution 0–2000-m Argo climatology referenced to a 1000-m velocity field derived from Argo float drifts. This reference field is dominated by basinwide alternating zonal jets with a meridional wavelength of about 3°. In regions where the sampling of SADCP data is sufficient, the consistency between the two independent datasets is striking; using the Argo drift reference is cruc

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19

Kwon, Young-Oh, Michael A. Alexander, Nicholas A. Bond, et al. "Role of the Gulf Stream and Kuroshio–Oyashio Systems in Large-Scale Atmosphere–Ocean Interaction: A Review." Journal of Climate 23, no. 12 (2010): 3249–81. http://dx.doi.org/10.1175/2010jcli3343.1.

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Abstract Ocean–atmosphere interaction over the Northern Hemisphere western boundary current (WBC) regions (i.e., the Gulf Stream, Kuroshio, Oyashio, and their extensions) is reviewed with an emphasis on their role in basin-scale climate variability. SST anomalies exhibit considerable variance on interannual to decadal time scales in these regions. Low-frequency SST variability is primarily driven by basin-scale wind stress curl variability via the oceanic Rossby wave adjustment of the gyre-scale circulation that modulates the latitude and strength of the WBC-related oceanic fronts. Rectificati

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20

Alberti, Tommaso, Davide Faranda, Giuseppe Consolini, Paola De Michelis, Reik V. Donner, and Vincenzo Carbone. "Concurrent Effects between Geomagnetic Storms and Magnetospheric Substorms." Universe 8, no. 4 (2022): 226. http://dx.doi.org/10.3390/universe8040226.

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An accurate understanding of dissimilarities in geomagnetic variability between quiet and disturbed periods has the potential to vastly improve space weather diagnosis. In this work, we exploit some recently developed methods of dynamical system theory to provide new insights and conceptual ideas in space weather science. In particular, we study the co-variation and recurrence statistics of two geomagnetic indices, SYM-H and AL, that measure the intensity of the globally symmetric component of the equatorial electrojet and that of the westward auroral electrojet, respectively. We find that the

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21

Giannattasio, Fabio, Alessio Pignalberi, Paola De Michelis, et al. "Parallel Electrical Conductivity at Low and Middle Latitudes in the Topside Ionosphere Derived from CSES-01 Measurements." Remote Sensing 14, no. 20 (2022): 5079. http://dx.doi.org/10.3390/rs14205079.

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The study of electrical currents in the topside ionosphere is of great importance, as it may allow a better understanding of the processes involved in the Sun–Earth interaction and magnetosphere–ionosphere–thermosphere coupling, two crucial aspects debated by the Space Weather scientific community. In this context, investigating the electrical conductivity parallel to the geomagnetic field in the topside ionosphere is of primary importance because: (1) it provides information on the capability of the ionosphere to conduct currents; (2) it relates current density and electric field through Ohm’

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22

Zawawi, Anis Adiba, Nur Fadilah Ab Aziz, Mohd Zainal Abidin Ab Kadir, Halimatun Hashim, and Zmnako Mohammed. "Evaluation of Geomagnetic Induced Current on 275 kV Power Transformer for a Reliable and Sustainable Power System Operation in Malaysia." Sustainability 12, no. 21 (2020): 9225. http://dx.doi.org/10.3390/su12219225.

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Geomagnetic induced current (GIC) occurs as a direct consequence of abnormal space weather which starts from the sun and may flow into a power system network through neutral grounding connections. The flow of GIC through grounded neutral power transformer has been a major concern to researchers since it can potentially affect power system equipment. Most of the previous research was focused on high and mid latitude countries only. However, it has been proven that the GIC is not only limited to high and mid latitudes, but also extends to power systems at lower geographic latitudes. This paper a

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23

Sivokon, V. P. "Geophysical aspect of extremely low frequency telecommunication systems." T-Comm 18, no. 5 (2024): 4–11. https://doi.org/10.36724/2072-8735-2024-18-5-4-11.

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Foreign telecommunication systems use frequencies below 3 kHz, which are called extremely low frequencies (ELF). The efficiency of radiation of electromagnetic waves of such frequencies by ground-based antenna devices is low. The discovery of the Getmantsev effect supposedly made it possible to use ionospheric current structures, which were called electric jets or electrojet, as emitters of electromagnetic waves in this frequency range. In works devoted to the active influence on the ionosphere of high latitudes in order to generate electromagnetic radiation ELF, the term "Polar electrojet ant

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24

Nair, Deepukumar M., James Parisi, K. M. Nair, et al. "Introducing DuPont™ GreenTape™ 9K5 Low Dielectric Constant, Low Temperature Co-Fired Ceramic (LTCC) Tape System." International Symposium on Microelectronics 2011, no. 1 (2011): 000544–52. http://dx.doi.org/10.4071/isom-2011-wa3-paper4.

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Low Temperature Co-fired Ceramic (LTCC) material systems have been successfully used in microwave and millimeter wave systems for several years. LTCC has very low dielectric loss, high reliability due to inherent hermeticity; high interconnect density, multilayer processing capability leading to true 3D packaging, and better cost-performance balance. While the medium range dielectric constants (7.00 – 8.00) offered by current tape systems have advantages, it is generally difficult to realize high speed systems and efficient antennas on LTCC, especially at millimeter wave frequencies. The diffi

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25

Mustapha, Abbas, Joshua Wisdom, Mukhtar Furfuri, and Mohammad Kaoje. "Longitudinal Response of the Low-latitude Ionosphere to 2017 Sudden Stratospheric Warming Event." International Journal of Atmospheric and Oceanic Sciences 9, no. 1 (2025): 1–8. https://doi.org/10.11648/j.ijaos.20250901.11.

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The Earth&apos;s ionosphere, a crucial region for communication and navigation systems, is susceptible to disturbances driven by both external (solar and geomagnetic activity) and internal (atmospheric waves) forces. These internal forces are known to be amplified during SSW events, creating significant ionospheric perturbations. This study investigates the longitudinal response of the low-latitude ionosphere, specifically focusing on the EIA, to the 2017 SSW event. Addressing a gap in current understanding, this research analyzes the longitudinal variations in TEC within the African and A

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26

Kappenman, John G. "Storm sudden commencement events and the associated geomagnetically induced current risks to ground-based systems at low-latitude and midlatitude locations." Space Weather 1, no. 3 (2003): n/a. http://dx.doi.org/10.1029/2003sw000009.

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Dhondt, Steven, Frank Delano Pot, and Karolus O. Kraan. "The importance of organizational level decision latitude for well-being and organizational commitment." Team Performance Management 20, no. 7/8 (2014): 307–27. http://dx.doi.org/10.1108/tpm-03-2014-0025.

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Purpose – This paper aims to focus on participation in the workplace and examines the relative importance of different dimensions of job control in relation to subjective well-being and organizational commitment. These dimensions are job autonomy (within a given job), functional support (from supervisor and colleagues) and organizational level decision latitude (shop-floor consultancy on process improvements, division of labor, workmates, targets, etc.). Interaction with work intensity is looked at as well. Design/methodology/approach – Measurements and data were taken from the European Workin

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28

Farah, Ashraf. "Accuracy Assessment Study of UNB3m Neutral Atmosphere Model for Global Tropospheric Delay Mitigation." Artificial Satellites 50, no. 4 (2015): 201–15. http://dx.doi.org/10.1515/arsa-2015-0016.

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Abstract Tropospheric delay is the second major source of error after the ionospheric delay for satellite navigation systems. The transmitted signal could face a delay caused by the troposphere of over 2m at zenith and 20m at lower satellite elevation angles of 10 degrees and below. Positioning errors of 10m or greater can result from the inaccurate mitigation of the tropospheric delay. Many techniques are available for tropospheric delay mitigation consisting of surface meteorological models and global empirical models. Surface meteorological models need surface meteorological data to give hi

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29

Milan, S. E., A. Grocott, C. Forsyth, S. M. Imber, P. D. Boakes, and B. Hubert. "A superposed epoch analysis of auroral evolution during substorm growth, onset and recovery: open magnetic flux control of substorm intensity." Annales Geophysicae 27, no. 2 (2009): 659–68. http://dx.doi.org/10.5194/angeo-27-659-2009.

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Abstract. We perform two superposed epoch analyses of the auroral evolution during substorms using the FUV instrument on the Imager for Magnetopause-to-Aurora Global Explorer (IMAGE) spacecraft. The larger of the two studies includes nearly 2000 substorms. We subdivide the substorms by onset latitude, a measure of the open magnetic flux in the magnetosphere, and determine average auroral images before and after substorm onset, for both electron and proton aurora. Our results indicate that substorms are more intense in terms of auroral brightness when the open flux content of the magnetosphere

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Joo, Byoung-Soo, Jung-Wook Woo, Jeong-Hun Lee, et al. "Assessment of the Impact of Geomagnetic Disturbances on Korean Electric Power Systems." Energies 11, no. 7 (2018): 1920. http://dx.doi.org/10.3390/en11071920.

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Geomagnetic disturbances have the potential to impact the operation of electric power systems, and thus the assessment of their impacts is required as the first step for secure power system operations. While the effects of the disturbances have been observed primarily at higher latitudes, geomagnetic problems are also observed at mid and low latitude locations, in particular including neighboring countries to Korea such as China and Japan. This paper deals with the assessment of impact of geomagnetic disturbances on Korean electric power systems. For the assessment, the geoelectric fields indu

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31

Feldstein, Y. I., L. I. Gromova, J. Woch, et al. "Structure of the auroral precipitation region in the dawn sector: relationship to convection reversal boundaries and field-aligned currents." Annales Geophysicae 19, no. 5 (2001): 495–519. http://dx.doi.org/10.5194/angeo-19-495-2001.

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Abstract. Abstract. Simultaneous DMSP F7 and Viking satellite measurements of the dawnside high-latitude auroral energy electron and ion precipitation show that the region of the low and middle altitude auroral precipitation consists of three characteristic plasma regimes. The recommendation of the IAGA Working Group IIF/III4 at the IAGA Assembly in Boulder, July 1995 to decouple the nomenclature of ionospheric populations from magnetospheric population is used for their notation. The most equatorial regime is the Diffuse Auroral Zone (DAZ) of diffuse spatially unstructured precipitating elect

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Kakad, Bharati, Amar Kakad, Durbha Sai Ramesh, and Gurbax S. Lakhina. "Diminishing activity of recent solar cycles (22–24) and their impact on geospace." Journal of Space Weather and Space Climate 9 (2019): A1. http://dx.doi.org/10.1051/swsc/2018048.

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This study examines the variation of different energies linked with the Sun and the Earth’s magnetosphere-ionosphere systems for solar cycles (SCs) 22–24 for which the gradual decrease in the solar activity is noticed. Firstly, we investigated the variation of solar magnetic energy density (SMED) for SCs 21–24 and its relation to the solar activity. We observed distinct double peak structures in SMED for the past four SCs, 21–24. This feature is consistent with noticeable asymmetry in their two peaks. For SCs 22–24 a significant decrease is observed in the integrated SMED of each SC. This redu

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Vankadara, Ram Kumar, Sampad Kumar Panda, Christine Amory-Mazaudier, et al. "Signatures of Equatorial Plasma Bubbles and Ionospheric Scintillations from Magnetometer and GNSS Observations in the Indian Longitudes during the Space Weather Events of Early September 2017." Remote Sensing 14, no. 3 (2022): 652. http://dx.doi.org/10.3390/rs14030652.

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Scintillation due to ionospheric plasma irregularities remains a challenging task for the space science community as it can severely threaten the dynamic systems relying on space-based navigation services. In the present paper, we probe the ionospheric current and plasma irregularity characteristics from a latitudinal arrangement of magnetometers and Global Navigation Satellite System (GNSS) stations from the equator to the far low latitude location over the Indian longitudes, during the severe space weather events of 6–10 September 2017 that are associated with the strongest and consecutive s

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Manju, G., T. K. Pant, C. V. Devasia, S. Ravindran, and R. Sridharan. "Electrodynamical response of the Indian low-mid latitude ionosphere to the very large solar flare of 28 October 2003 – a case study." Annales Geophysicae 27, no. 10 (2009): 3853–60. http://dx.doi.org/10.5194/angeo-27-3853-2009.

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Abstract. The electrodynamic effects on the low-mid latitude ionospheric region have been investigated using GPS (global positioning system) data, ionosonde data and ΔH values, during the very large solar flare (X17.2/4B) of 28 October 2003. The results bring out the flare induced unusual behaviour of the equatorial ionosphere on this day just prior to sunset. The important observations are i) Large and prolonged Ne enhancements observed from ionosonde data just after the flare-related peak enhancement in EUV flux. The observed enhancement in Ne is due to the increase in ionization production

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Krauklis, I., A. N. Fazakerley, C. J. Owen, et al. "Preliminary two-point observations of the mid-altitude cusp by Cluster PEACE and FGM." Annales Geophysicae 19, no. 10/12 (2001): 1579–87. http://dx.doi.org/10.5194/angeo-19-1579-2001.

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Abstract. On 1 October 2000, Cluster spacecraft Samba (Cluster 3) and Tango (Cluster 4) made an outbound crossing of the northern mid-altitude (4.7 RE) cusp region, moving roughly parallel to the noon meridian. We present preliminary observations from this interval made by the PEACE and FGM instruments. The interplanetary magnetic field at the magnetopause is estimated to have turned south at the time of our observations, based on ACE data as well as a rough estimate of the time taken for the solar wind to travel between ACE and the magnetopause. Cluster 3 encountered the low-latitude boundary

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Belehaki, A., I. Tsagouri, and H. Mavromichalaki. "Study of the longitudinal expansion velocity of the substorm current wedge." Annales Geophysicae 16, no. 11 (1998): 1423–33. http://dx.doi.org/10.1007/s00585-998-1423-9.

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Abstract. In this work we examine simultaneous observations from the two geosynchronous satellites GOES-5 and GOES-6 located at 282°E and 265°E respectively, and from middle and low latitude ground observatories located within 250°E and 294°E geographic longitude, during isolated substorms of moderate activity. The spatial distribution of our observation points allows us to make a detailed study of the azimuthal expansion of the substorm current wedge. The data analysis shows evidence that the substorm initiation and development mechanism include the cross-tail current diversion/ disruption, t

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Habtu, Yitagesu, Abera Kumie, Medhine Selamu, Mirgissa Kaba, Hidenori Harada, and Eshetu Girma. "Exploring the link between work-related psychosocial factors and professional quality of life among ethiopian healthcare workers: Insights from structural equation modelling analyses." PLOS ONE 20, no. 3 (2025): e0319870. https://doi.org/10.1371/journal.pone.0319870.

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Background Work-related psychosocial factors increase the likelihood of poor professional quality of life (PQoL) outcomes, which are composed of three subscales burnout (BO), compassion fatigue(CF), and low compassion satisfaction (CS). However, studies on the impact of work-related psychosocial factors and the mediating role of workplace social support on PQoL in Ethiopian healthcare workers are limited. Therefore, our study aimed to explore the link between work-related factors and three subscales of PQoL, and assess the mediational role of workplace social support. Methods We used a cross-s

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Sandholt, P. E., and C. J. Farrugia. "Plasma flows, Birkeland currents and auroral forms in relation to the Svalgaard-Mansurov effect." Annales Geophysicae 30, no. 5 (2012): 817–30. http://dx.doi.org/10.5194/angeo-30-817-2012.

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Abstract. The traditional explanation of the polar cap magnetic deflections, referred to as the Svalgaard-Mansurov effect, is in terms of currents associated with ionospheric flow resulting from the release of magnetic tension on newly open magnetic field lines. In this study, we aim at an updated description of the sources of the Svalgaard-Mansurov effect based on recent observations of configurations of plasma flow channels, Birkeland current systems and aurorae in the magnetosphere-ionosphere system. Central to our description is the distinction between two different flow channels (FC 1 and

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Zainuddin, Aznilinda, Muhammad Asraf Hairuddin, Zatul Iffah Abd Latiff, Felipe Benavides, Mohamad Huzaimy Jusoh, and Ahmad Ihsan Mohd Yassin. "Gated Recurrent Unit (GRU)-Based GIC Prediction Using dB/dt as a Proxy." Journal of Physics: Conference Series 2915, no. 1 (2024): 012012. https://doi.org/10.1088/1742-6596/2915/1/012012.

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Abstract Geomagnetically induced currents (GICs) pose a significant threat to power systems during geomagnetic storms. This work introduces a GRU approach for GICs forecasting based on the rate of change of the geomagnetic field, dB/dt at two low-latitude stations, Muntinlupa (MUT) and Guam (GUA). The performances of the model were evaluated based on the data collected from the Solar Cycle 23 (SC23) as training data, and Solar Cycle 24 (SC24) at the validation stage. The GRU model demonstrated good predictive accuracy with low RMSE values, particularly for MUT model (RMSE = 0.00917). MUT shows

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Schmitter, E. D. "Remote auroral activity detection and modeling using low frequency transmitter signal reception at a midlatitude site." Annales Geophysicae 28, no. 9 (2010): 1807–11. http://dx.doi.org/10.5194/angeo-28-1807-2010.

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Abstract. The low frequency propagation conditions along the path from Iceland to Germany (52° N 8° E) using the NRK/TFK 37.5 kHz transmitter (63.9° N 22.5° W) prove as an easy to monitor and reliable proxy for north auroral activity. Signal processing using wavelet decomposition allows for quantitative activity level estimations. Calibration is based upon NOAA POES auroral activity data. Using an auroral oval model for the local intensity distribution of solar energetic particle precipitation and a wave propagation model ionospheric D-layer height decreases along the path can be derived. This

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Ogweno Jeremiah Okeyo. "A comprehensive systematic review of privacy and security issues in Satellite Networks." GSC Advanced Research and Reviews 20, no. 1 (2024): 349–75. http://dx.doi.org/10.30574/gscarr.2024.20.1.0267.

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The recent advancements in satellite networks have garnered significant interest due to their extensive geographic coverage and flexible deployment capabilities, offering a promising solution for global communications and transforming traditional communication methods. Despite these advancements, current satellite systems face challenges such as high propagation delays and inadequate coverage of high-latitude regions, particularly in Geostationary (GEO) systems. Low Earth Orbit (LEO) systems, which can address these issues, are primarily used for voice services, as seen in the Iridium system,

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Ogweno, Jeremiah Okeyo. "A comprehensive systematic review of privacy and security issues in Satellite Networks." GSC Advanced Research and Reviews 20, no. 1 (2024): 349–75. https://doi.org/10.5281/zenodo.13684957.

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The recent advancements in satellite networks have garnered significant interest due to their extensive geographic coverage and flexible deployment capabilities, offering a promising solution for global communications and transforming traditional communication methods. Despite these advancements, current satellite systems face challenges such as high propagation delays and inadequate coverage of high-latitude regions, particularly in Geostationary (GEO) systems. Low Earth Orbit (LEO) systems, which can address these issues, are primarily used for voice services, as seen in the Iridium system,

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Chamberlin, Jessica, Camryn Soehnlein, Jason Evans, and Benjamin Tanner. "A 1900 Year Sediment Record Suggests Recent Establishment of Black Mangrove (Avicennia Germinans) Stands within a Salt Marsh in St. Augustine, Florida, USA." Quaternary 5, no. 1 (2022): 2. http://dx.doi.org/10.3390/quat5010002.

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Salt marshes and mangroves are currently being affected by rising temperatures. Mangroves thrive below −29° N latitude in Florida, USA, and have a low tolerance for extreme cold events, whereas salt marshes dominate further north. One potential effect of climate change is a reduction in the frequency of extreme cold events, which may lead to mangrove expansion into salt marsh systems. Our research identified sediment proxy indicators of salt marsh and mangrove environments. These indicators were applied to soil cores from intertidal wetlands near the current northern limit of mangrove presence

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Hatton, Jade E., Katharine R. Hendry, Jonathan R. Hawkings, et al. "Silicon isotopes in Arctic and sub-Arctic glacial meltwaters: the role of subglacial weathering in the silicon cycle." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 475, no. 2228 (2019): 20190098. http://dx.doi.org/10.1098/rspa.2019.0098.

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Glacial environments play an important role in high-latitude marine nutrient cycling, potentially contributing significant fluxes of silicon (Si) to the polar oceans, either as dissolved silicon (DSi) or as dissolvable amorphous silica (ASi). Silicon is a key nutrient in promoting marine primary productivity, contributing to atmospheric CO 2 removal. We present the current understanding of Si cycling in glacial systems, focusing on the Si isotope (δ 30 Si) composition of glacial meltwaters. We combine existing glacial δ 30 Si data with new measurements from 20 sub-Arctic glaciers, showing that

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Mitchell, Andrew D., and Theodore Samlidis. "Cloud services and government digital sovereignty in Australia and beyond." International Journal of Law and Information Technology 29, no. 4 (2021): 364–94. http://dx.doi.org/10.1093/ijlit/eaac003.

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Abstract The Australian government has expressed concerns about various ‘data challenges’ confronting the public sector. Similar concerns are reverberating throughout the globe. Other governments continue to voice and act upon their own apprehensions about the threats posed to public and private society by attenuations to their nations’ ‘digital sovereignty’. This article critically examines the Australian government’s potential justifications, particularly under international trade law, for introducing digital sovereignty policies explicitly targeted at protecting government cyber systems and

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Shiau, L. J., S. C. Clemens, M. T. Chen, M. Yamamoto, and Y. Yokoyama. "SST phases in the open-ocean and margins of the tropical Pacific; implication on tropical climate dynamics." Climate of the Past Discussions 10, no. 2 (2014): 1857–99. http://dx.doi.org/10.5194/cpd-10-1857-2014.

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Abstract. The tropical Pacific exerts a major effect on the global climate system and might have driven large extra-tropical climate change. We present a 320 kyr high resolution UK'37-sea surface temperature (SST) record from core MD052928 (11°17.26' S, 148°51.60' E, water depth 2250 m) located off southeastern Papua New Guinea (PNG), in the western tropical Pacific. The age model of the core is based on AMS 14C dating of planktic foraminifers and correlation of benthic to the LR04 stack. The UK'37-SST ranges from 26.5 to 29 °C, showing glacial–interglacial and millennial variations. We assess

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Mozzoni, D. T., M. Mandea, and J. Cain. "Magnetic perturbations seen by CHAMP and evaluated using the TIE-GCM." Annales Geophysicae 25, no. 7 (2007): 1543–54. http://dx.doi.org/10.5194/angeo-25-1543-2007.

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Abstract. The Thermosphere-Ionosphere Electrodynamics General Circulation Model (TIE-GCM) is a self-consistent, global, atmospheric model that can be used to estimate magnetic perturbations at satellite altitude. These computed perturbations can then be compared with the magnetic vector data provided by low-earth orbiting satellites. In this initial study, the quietest day of each month from 2001–2005 was selected for comparison. CHAMP magnetic vector residuals were computed for these intervals using the CHAOS model to remove core and crustal geomagnetic contributions. Under various input para

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Nichols, J. D., and S. W. H. Cowley. "Magnetosphere-ionosphere coupling currents in Jupiter’s middle magnetosphere: dependence on the effective ionospheric Pedersen conductivity and iogenic plasma mass outflow rate." Annales Geophysicae 21, no. 7 (2003): 1419–41. http://dx.doi.org/10.5194/angeo-21-1419-2003.

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Abstract. The amplitude and spatial distribution of the coupling currents that flow between Jupiter’s ionosphere and middle magnetosphere, which enforce partial corotation on outward-flowing iogenic plasma, depend on the values of the effective Pedersen conductivity of the jovian ionosphere and the mass outflow rate of iogenic plasma. The values of these parameters are, however, very uncertain. Here we determine how the solutions for the plasma angular velocity and current components depend on these parameters over wide ranges. We consider two models of the poloidal magnetospheric magnetic fie

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Liu, Congliang, Yueqiang Sun, Weihua Bai, et al. "Effect of Multiple GNSS Integration on the Number and Spatiotemporal Coverage of Radio Occultation Events." Atmosphere 13, no. 5 (2022): 654. http://dx.doi.org/10.3390/atmos13050654.

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The development of global navigation satellite systems (GNSSs) and multi-system compatible radio occultation (RO) techniques provides favorable conditions and opportunities for increasing the number of occultation events and improving their spatiotemporal coverage. The performance of the multiple GNSS RO event number, spatiotemporal coverage, and uniformity need assessments by robust and functional approaches. Firstly, a simulation system of RO events, which took the orbit perturbations into account, was established, and the concepts of global coverage fraction and uniformity of RO events were

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Pinault, Jean-Louis. "Morlet Cross-Wavelet Analysis of Climatic State Variables Expressed as a Function of Latitude, Longitude, and Time: New Light on Extreme Events." Mathematical and Computational Applications 27, no. 3 (2022): 50. http://dx.doi.org/10.3390/mca27030050.

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This study aims to advance our knowledge in the genesis of extreme climatic events with the dual aim of improving forecasting methods while clarifying the role played by anthropogenic warming. Wavelet analysis is used to highlight the role of coherent Sea Surface Temperature (SST) anomalies produced from short-period oceanic Rossby waves resonantly forced, with two case studies: a Marine Heatwave (MHW) that occurred in the northwestern Pacific with a strong climatic impact in Japan, and an extreme flood event that occurred in Germany. Ocean–atmosphere interactions are evidenced by decomposing

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