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Artykuły w czasopismach na temat „Geomagnetically quiet”

Autor: Grafiati

Data publikacji: 6 września 2023

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1

Unnikrishnan, K. "A comparative study on chaoticity of equatorial/low latitude ionosphere over Indian subcontinent during geomagnetically quiet and disturbed periods." Nonlinear Processes in Geophysics 17, no. 6 (2010): 765–76. http://dx.doi.org/10.5194/npg-17-765-2010.

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Abstract. In the present study, the latitudinal aspect of chaotic behaviour of ionosphere during quiet and storm periods are analyzed and compared by using GPS TEC time series measured at equatorial trough, crest and outside crest stations over Indian subcontinent, by employing the chaotic quantifiers like Lyapunov exponent (LE), correlation dimension (CD), entropy and nonlinear prediction error (NPE). It is observed that the values of LE are low for storm periods compared to those of quiet periods for all the stations considered here. The lowest value of LE is observed at the trough station,

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2

SHEN, Changshou, Minyun ZI, Jingsong WANG, and Jiyao XU. "Structure Distribution ofNmF2 during a Geomagnetically Quiet Period." Chinese Journal of Geophysics 46, no. 6 (2003): 1050–57. http://dx.doi.org/10.1002/cjg2.425.

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3

Kane, T. A., R. A. Makarevich, and J. C. Devlin. "HF radar observations of ionospheric backscatter during geomagnetically quiet periods." Annales Geophysicae 30, no. 1 (2012): 221–33. http://dx.doi.org/10.5194/angeo-30-221-2012.

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Abstract. The quiet-time coherent backscatter from the F-region observed by the Tasman International Geospace Environment Radar (TIGER) Bruny Island HF radar is analysed statistically in order to determine typical trends and controlling factors in the ionospheric echo occurrence. A comparison of the F-region peak density values from the IRI-2007 model and ionosonde measurements in the vicinity of the radar's footprint shows a very good agreement, particularly at subauroral and auroral latitudes, and model densities within the radar's footprint are used in the following analyses. The occurrence

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4

Kitamura, N., K. Seki, Y. Nishimura, et al. "Photoelectron flows in the polar wind during geomagnetically quiet periods." Journal of Geophysical Research: Space Physics 117, A7 (2012): n/a. http://dx.doi.org/10.1029/2011ja017459.

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5

Maeda, Sawako, Hitoshi Fujiwara, and Satonori Nozawa. "Momentum balance of daysideEregion neutral winds during geomagnetically quiet summer days." Journal of Geophysical Research: Space Physics 104, A9 (1999): 19871–79. http://dx.doi.org/10.1029/1999ja900224.

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6

Liu, Z. ‐Y, Q. ‐G Zong, H. Zou, Y. F. Wang, and B. Wang. "Drifting Electron Holes Occurring During Geomagnetically Quiet Times: BD‐IES Observations." Journal of Geophysical Research: Space Physics 124, no. 11 (2019): 8695–706. http://dx.doi.org/10.1029/2019ja027194.

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7

Edward, Uluma, Ndinya Boniface, and Omondi George. "SCINDA-GPS derived TEC depletions and amplitude scintillations over Kisumu, Kenya during selected quiet and storm days of 2013 and 2014." International Journal of Advanced Astronomy 8, no. 1 (2020): 1. http://dx.doi.org/10.14419/ijaa.v8i1.30232.

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Total Electron Content (TEC) depletion and amplitude scintillation (S4) can be derived from, SCINDA-GPS receivers situated in various parts of the equatorial region. In this paper we present results of characterization of TEC depletions and amplitude scintillations over Kisumu, Kenya (Geomagnetic coordinates: 9.64o S, 108.59o E; Geographic coordinates: 0.02o S, 34.6o E) for both selected geomagnetically quiet and geomagnetically disturbed conditions between 1st January 2013 and 31st December 2014 using data derived from the Kisumu NovAtel GSV4004B SCINDA-GPS receiver situated at Maseno Univers

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8

Bounhir, Aziza, Zouhair Benkhaldoun, Jonathan J. Makela, et al. "Thermospheric Dynamics in Quiet and Disturbed Conditions." Proceedings of the International Astronomical Union 13, S335 (2017): 151–58. http://dx.doi.org/10.1017/s174392131700919x.

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AbstractThis paper presents the thermospheric winds and temperature properties measured with a Fabry-Pérot interferometer (FPI) over Oukaimeden observatory (31.2°N, 7.8°W, 22.8°N magnetic) in Morocco. After Three years of successful functioning from 2014 to 2017, we can address the seasonal behavior of the temperature and the winds (vertical, zonal and meridional). The dependence of the thermospheric winds and temperature on the solar cycle is also presented. The day-to-day variations of the quiet time wind pattern exhibits the importance of other type of waves superposed to the main diurnal t

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9

Mendes, Odim, Margarete Oliveira Domingues, Ezequiel Echer, Rajkumar Hajra, and Varlei Everton Menconi. "Characterization of high-intensity, long-duration continuous auroral activity (HILDCAA) events using recurrence quantification analysis." Nonlinear Processes in Geophysics 24, no. 3 (2017): 407–17. http://dx.doi.org/10.5194/npg-24-407-2017.

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Abstract. Considering the magnetic reconnection and the viscous interaction as the fundamental mechanisms for transfer particles and energy into the magnetosphere, we study the dynamical characteristics of auroral electrojet (AE) index during high-intensity, long-duration continuous auroral activity (HILDCAA) events, using a long-term geomagnetic database (1975–2012), and other distinct interplanetary conditions (geomagnetically quiet intervals, co-rotating interaction regions (CIRs)/high-speed streams (HSSs) not followed by HILDCAAs, and events of AE comprised in global intense geomagnetic di

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10

Mendoza, B., and J. Ramírez. "A straightforward estimation of the maximum sunspot number for cycle 23." Annales Geophysicae 17, no. 5 (1999): 639–41. http://dx.doi.org/10.1007/s00585-999-0639-7.

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Abstract. Using the annual number of geomagnetically quiet days (aa < 20 γ) for the year after the solar minimum, this precursor method predicts that the maximum sunspot number for cycle 23 will be 140 ± 32, indicating that cycle 23 will be similar to cycles 21 and 22.Key words. Solar physics · astrophysics and astronomy (magnetic fields; general)

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11

Jonah, Olusegun F., Shunrong Zhang, Anthea J. Coster, et al. "Understanding Inter-Hemispheric Traveling Ionospheric Disturbances and Their Mechanisms." Remote Sensing 12, no. 2 (2020): 228. http://dx.doi.org/10.3390/rs12020228.

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Traveling ionospheric disturbances (TIDs) are wave-like disturbances in ionospheric plasma density. They are often observed during both quiet (medium-scale TID) and geomagnetically disturbed (large-scale TID) conditions. Their amplitudes can reach double-digit percentages of the background plasma density, and their existence presents a challenge for accurate ionosphere specification. In this study, we examine TID properties using observations obtained during two geomagnetically disturbed periods using multiple ground and space-borne instruments, such as magnetometers, Global Navigation Satelli

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12

Morozova, Anna L., Teresa Barata, and Tatiana Barlyaeva. "PCA-MRM Model to Forecast TEC at Middle Latitudes." Atmosphere 13, no. 2 (2022): 323. http://dx.doi.org/10.3390/atmos13020323.

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The total electron content (TEC) over the Iberian Peninsula was modelled using PCA-MRM models based on decomposition of the observed TEC series using the principal component analysis (PCA) and reconstruction of the daily modes’ amplitudes by a multiple linear regression model (MRM) using space weather parameters as regressors. The following space weather parameters are used: proxies for the solar UV and XR fluxes, number of the solar flares of different classes, parameters of the solar wind and of the interplanetary magnetic field, and geomagnetic indices. Time lags of 1 and 2 days between the

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13

Pavlov, A. V., and N. M. Pavlova. "Anomalous variations of <I>Nm</I>F2 over the Argentine Islands: a statistical study." Annales Geophysicae 27, no. 4 (2009): 1363–75. http://dx.doi.org/10.5194/angeo-27-1363-2009.

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Abstract. We present a statistical study of variations in the F2-layer peak electron density, NmF2, and altitude, hmF2, over the Argentine Islands ionosonde. The critical frequencies, foF2, and, foE, of the F2 and E-layers, and the propagation factor, M(3000)F2, measured by the ionosonde during the 1957–1959 and 1962–1995 time periods were used in the statistical analysis to determine the values of NmF2 and hmF2. The probabilities to observe maximum and minimum values of NmF2 and hmF2 in a diurnal variation of the electron density are calculated. Our study shows that the main part of the maxim

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14

Nishida, A., T. Mukai, T. Yamamoto, S. Kokubun, and K. Maezawa. "A unified model of the magnetotail convection in geomagnetically quiet and active times." Journal of Geophysical Research: Space Physics 103, A3 (1998): 4409–18. http://dx.doi.org/10.1029/97ja01617.

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15

Chisham, G. "Giant pulsations: An explanation for their rarity and occurrence during geomagnetically quiet times." Journal of Geophysical Research: Space Physics 101, A11 (1996): 24755–63. http://dx.doi.org/10.1029/96ja02540.

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16

Pezzopane, M., P. R. Fagundes, L. Ciraolo, E. Correia, M. A. Cabrera, and R. G. Ezquer. "Unusual nighttime impulsivefoF2 enhancement below the southern anomaly crest under geomagnetically quiet conditions." Journal of Geophysical Research: Space Physics 116, A12 (2011): n/a. http://dx.doi.org/10.1029/2011ja016593.

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17

Khazanov, G. V., E. N. Krivorutsky, and D. G. Sibeck. "Formation of the Potential Jump Over the Geomagnetically Quiet Sunlit Polar Cap Region." Journal of Geophysical Research: Space Physics 124, no. 6 (2019): 4384–401. http://dx.doi.org/10.1029/2019ja026576.

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18

Oko, S. O., C. A. Onwumechili, and P. O. Ezema. "Geomagnetically quiet day ionospheric currents over the Indian sector—II. Equatorial electrojet currents." Journal of Atmospheric and Terrestrial Physics 58, no. 5 (1996): 555–64. http://dx.doi.org/10.1016/0021-9169(95)00056-9.

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19

Singh, Ashutosh K., K. K. Singh, A. K. Singh, and Lalmani. "Simultaneous observation of whistlers and emissions during a geomagnetically quiet period at low latitude." Astrophysics and Space Science 331, no. 2 (2010): 459–68. http://dx.doi.org/10.1007/s10509-010-0465-0.

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20

Rodriguez, J. V., H. C. Carlson, and R. A. Heelis. "Auroral forms that extend equatorward from the persistent midday aurora during geomagnetically quiet periods." Journal of Atmospheric and Solar-Terrestrial Physics 86 (September 2012): 6–24. http://dx.doi.org/10.1016/j.jastp.2012.06.001.

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21

Crowley, G., T. B. Jones, and J. R. Dudeney. "Comparison of short period TID morphologies in Antarctica during geomagnetically quiet and active intervals." Journal of Atmospheric and Terrestrial Physics 49, no. 11-12 (1987): 1155–62. http://dx.doi.org/10.1016/0021-9169(87)90098-5.

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22

Ezema, P. O., C. A. Onwumechili, and S. O. Oko. "Geomagnetically quiet day ionospheric currents over the Indian sector—III. Counter equatorial electrojet currents." Journal of Atmospheric and Terrestrial Physics 58, no. 5 (1996): 565–77. http://dx.doi.org/10.1016/0021-9169(95)00057-7.

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23

Liu, Libo, Yuyan Yang, Huijun Le, et al. "Unexpected Regional Zonal Structures in Low Latitude Ionosphere Call for a High Longitudinal Resolution of the Global Ionospheric Maps." Remote Sensing 14, no. 10 (2022): 2315. http://dx.doi.org/10.3390/rs14102315.

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This study reports unexpected strong longitudinal structures from Global Navigation Satellite System (GNSS) derived total electron content (TEC) observations in the low-latitude ionosphere over Asia. The observations during 2019–2020 show diverse patterns in the zonal difference of regional TEC, even under geomagnetically quiet conditions. The TEC in the northern hemisphere occasionally exhibits drastic zonal gradients. The intense regional gradients in TEC span a longitudinal extent of about 20°. The higher values may appear on the east or the west side. Strong zonal gradients may appear in a

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24

Klausner, Virginia, Andrés Reinaldo Rodriguez Papa, Cláudia Maria Nicole Cândido, Margarete Oliveira Domingues, and Odim Mendes. "An alternative way to identify local geomagnetically quiet days: a case study using wavelet analysis." Annales Geophysicae 34, no. 4 (2016): 451–62. http://dx.doi.org/10.5194/angeo-34-451-2016.

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Abstract. This paper proposes a new method to evaluate geomagnetic activity based on wavelet analysis during the solar minimum activity (2007). In order to accomplish this task, a newly developed algorithm called effectiveness wavelet coefficient (EWC) was applied. Furthermore, a comparison between the 5 geomagnetically quiet days determined by the Kp-based method and by wavelet-based method was performed. This paper provides a new insight since the geomagnetic activity indexes are mostly designed to quantify the extent of disturbance rather than the quietness. The results suggest that the EWC

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25

Song, Seok-Min, and Kyungguk Min. "Analysis of the Tsyganenko Magnetic Field Model Accuracy during Geomagnetic Storm Times Using the GOES Data." Journal of Astronomy and Space Sciences 39, no. 4 (2022): 159–67. http://dx.doi.org/10.5140/jass.2022.39.4.159.

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Because of the small number of spacecraft available in the Earth’s magnetosphere at any given time, it is not possible to obtain direct measurements of the fundamental quantities, such as the magnetic field and plasma density, with a spatial coverage necessary for studying, global magnetospheric phenomena. In such cases, empirical as well as physics-based models are proven to be extremely valuable. This requires not only having high fidelity and high accuracy models, but also knowing the weakness and strength of such models. In this study, we assess the accuracy of the widely used Tsyganenko m

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26

Onwumechili, C. A., S. O. Oko, and P. O. Ezema. "Geomagnetically quiet day ionospheric currents over the Indian sector—I. Worldwide part of Sq currents." Journal of Atmospheric and Terrestrial Physics 58, no. 5 (1996): 541–53. http://dx.doi.org/10.1016/0021-9169(95)00055-0.

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27

Liu, L., W. Wan, M. L. Zhang, B. Ning, S. R. Zhang, and J. M. Holt. "Variations of topside ionospheric scale heights over Millstone Hill during the 30-day incoherent scatter radar experiment." Annales Geophysicae 25, no. 9 (2007): 2019–27. http://dx.doi.org/10.5194/angeo-25-2019-2007.

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Abstract. A 30-day incoherent scatter radar (ISR) experiment was conducted at Millstone Hill (288.5° E, 42.6° N) from 4 October to 4 November 2002. The altitude profiles of electron density Ne, ion and electron temperature (Ti and Te), and line-of-sight velocity during this experiment were processed to deduce the topside plasma scale height Hp, vertical scale height VSH, Chapman scale height Hm, ion velocity, and the relative altitude gradient of plasma temperature (dTp/dh)/Tp, as well as the F2 layer electron density (NmF2) and height (hmF2). These data are analyzed to explore the variations

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28

Buresova, D., Lj R. Cander, A. Vernon, and B. Zolesi. "Real-time ionospheric N(h) profile updating over Europe using IRI-2000 model." Advances in Radio Science 2 (May 27, 2005): 299–303. http://dx.doi.org/10.5194/ars-2-299-2004.

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Abstract. In this paper a method for real-time updating of ionospheric electron density profile, N(h), over Europe using an ionospheric model and real-time measurements at ionosonde locations is presented. The N(h) profile update over European area has been simulated with the IRI-2000 ionospheric model and real-time N(h) profiles obtained from the EU COST271 Action Space Weather Database. Preliminary findings are shown for the geomagnetically quiet day on 4 May 2003 and disturbed day on 24 May 2002. Results are discussed in the context of real-time N(h) profile updating capabilities and effect

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29

Witasse, O., J. Lilensten, C. Lathuillere, and B. Pibaret. "Meridional thermospheric neutral wind at high latitude over a full solar cycle." Annales Geophysicae 16, no. 10 (1998): 1400–1409. http://dx.doi.org/10.1007/s00585-998-1400-3.

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Abstract. EISCAT radar experiments over a full solar cycle between January 1984 and March 1995 have been used to construct meridional neutral wind patterns in the ionospheric F region. For locally geomagnetically quiet periods the neutral winds have been binned according to season, solar activity, and universal time. The diurnal and seasonal behaviors and the effect of the solar flux are described. An empirical model of the meridional neutral wind for the high latitudes at eight altitudes in the ionospheric F region over a full solar cycle is presented. Results are compared with other recent e

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30

Aladjev, G. A., O. V. Evstafiev, V. S. Mingalev, G. I. Mingaleva, E. D. Tereshchenko, and B. Z. Khudukon. "Interpretation of ionospheric F-region structures in the vicinity of ionisation troughs observed by satellite radio tomography." Annales Geophysicae 19, no. 1 (2001): 25–36. http://dx.doi.org/10.5194/angeo-19-25-2001.

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Abstract. Tomographic images of the spatial distribution of electron density in the ionospheric F-region are presented from the Russian-American Tomography Experiment (RATE) in November 1993 as well as from campaigns carried out in northern Scandinavia in November 1995 and in Russia in April 1990. The reconstructions selected display the ionisation troughs above the tomographic chains of receivers during geomagnetically quiet and disturbed periods. Two mathematical models of the high-latitude ionosphere developed in the Polar Geophysical Institute have been applied for interpretation of the ob

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31

Elmunim, Nouf Abd, Mardina Abdullah, and Siti Aminah Bahari. "Evaluating the Performance of IRI-2016 Using GPS-TEC Measurements over the Equatorial Region." Atmosphere 12, no. 10 (2021): 1243. http://dx.doi.org/10.3390/atmos12101243.

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Total electron content (TEC) is an important parameter in the ionosphere that is extensively used to study the variability of the ionosphere as it significantly affects radio wave propagations, causing delays on GPS signals. Therefore, evaluating the performance of ionospheric models is crucial to reveal the variety of ionospheric behaviour in different solar activity periods during geomagnetically quiet and disturbed periods for further improvements of the IRI model performance over the equatorial region. This research aimed to investigate the variations of ionospheric VTEC and observe the im

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32

Chen, Junjie, and Jiuhou Lei. "A Simulation Study on the Latitudinal Variations of Ionospheric Zonal Electric Fields Under Geomagnetically Quiet Conditions." Journal of Geophysical Research: Space Physics 124, no. 2 (2019): 1444–53. http://dx.doi.org/10.1029/2018ja026174.

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33

Zhao, B., W. Wan, L. Liu, et al. "Anomalous enhancement of ionospheric electron content in the Asian-Australian region during a geomagnetically quiet day." Journal of Geophysical Research: Space Physics 113, A11 (2008): n/a. http://dx.doi.org/10.1029/2007ja012987.

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34

Nishida, A., T. Yamamoto, K. Tsuruda, et al. "Structure of the neutral sheet in the distant tail (x=−210 Re) in geomagnetically quiet times." Geophysical Research Letters 21, no. 25 (1994): 2951–54. http://dx.doi.org/10.1029/94gl01422.

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35

Sindelarova, T., Z. Mosna, D. Buresova, J. Chum, L. A. McKinnell, and R. Athieno. "Observations of wave activity in the ionosphere over South Africa in geomagnetically quiet and disturbed periods." Advances in Space Research 50, no. 2 (2012): 182–95. http://dx.doi.org/10.1016/j.asr.2012.04.016.

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36

Pavlo, A. V., and M. J. Buonsanto. "Anomalous electron density events in the quiet summer ionosphere at solar minimum over Millstone Hill." Annales Geophysicae 16, no. 4 (1998): 460–69. http://dx.doi.org/10.1007/s00585-998-0460-8.

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Abstract. This study compares the observed behavior of the F region ionosphere over Millstone Hill with calculations from the IZMIRAN model for solar minimum for the geomagnetically quiet period 23-25 June 1986, when anomalously low values of hmF2(<200 km) were observed. We found that these low values of hmF2 (seen as a G condition on ionograms) exist in the ionosphere due to a decrease of production rates of oxygen ions resulting from low values of atomic oxygen density. Results show that determination of a G condition using incoherent scatter radar data is sensitive both to the true conce

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37

Jensen, J. W., and B. G. Fejer. "Longitudinal dependence of middle and low latitude zonal plasma drifts measured by DE-2." Annales Geophysicae 25, no. 12 (2007): 2551–59. http://dx.doi.org/10.5194/angeo-25-2551-2007.

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Abstract. We used ion drift observations from the DE-2 satellite to study for the first time the longitudinal variations of middle and low latitude F region zonal plasma drifts during quiet and disturbed conditions. The quiet-time middle latitude drifts are predominantly westward; the low latitude drifts are westward during the day and eastward at night. The daytime quiet-time drifts do not change much with longitude; the nighttime drifts have strong season dependent longitudinal variations. In the dusk-premidnight period, the equinoctial middle latitude westward drifts are smallest in the Eur

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38

McCormac, F. G., T. L. Killeen, J. P. Thayer, et al. "Circulation of the polar thermosphere during geomagnetically quiet and active times as observed by Dynamics Explorer 2." Journal of Geophysical Research 92, A9 (1987): 10133. http://dx.doi.org/10.1029/ja092ia09p10133.

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39

Amabayo, Emirant B., Edward Jurua, and Pierre J. Cilliers. "Assessment of scintillation proxy maps for a scintillation study during geomagnetically quiet and disturbed conditions over Uganda." Journal of Atmospheric and Solar-Terrestrial Physics 154 (February 2017): 47–54. http://dx.doi.org/10.1016/j.jastp.2016.12.009.

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40

Kitamura, N., A. Shinbori, Y. Nishimura, T. Ono, M. Iizima, and A. Kumamoto. "Seasonal variations of the electron density distribution in the polar region during geomagnetically quiet periods near solar maximum." Journal of Geophysical Research: Space Physics 114, A1 (2009): n/a. http://dx.doi.org/10.1029/2008ja013288.

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41

Giang, T. T., M. Hamrin, M. Yamauchi, et al. "Outflowing protons and heavy ions as a source for the sub-keV ring current." Annales Geophysicae 27, no. 2 (2009): 839–49. http://dx.doi.org/10.5194/angeo-27-839-2009.

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Abstract. Data from the Cluster CIS instrument have been used for studying proton and heavy ion (O+ and He+) characteristics of the sub-keV ring current. Thirteen events with dispersed heavy ions (O+ and He+) were identified out of two years (2001 and 2002) of Cluster data. All events took place during rather geomagnetically quiet periods. Three of those events have been investigated in detail: 21 August 2001, 26 November 2001 and 20 February 2002. These events were chosen from varying magnetic local times (MLT), and they showed different characteristics. In this article, we discuss the potent

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42

Sahai, Y., F. Becker-Guedes, P. R. Fagundes, et al. "Observations of the F-region ionospheric irregularities in the South American sector during the October 2003 "Halloween Storms"." Annales Geophysicae 27, no. 12 (2009): 4463–77. http://dx.doi.org/10.5194/angeo-27-4463-2009.

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Abstract. The response of the ionospheric F-region in the South American sector during the super geomagnetic storms on 29 and 30 October 2003 is studied in the present investigation. In this paper, we present ionospheric sounding observations during the period 29–31 October 2003 obtained at Palmas (a near equatorial location) and Sao Jose dos Campos (a location under the southern crest of the equatorial ionospheric anomaly), Brazil, along with observations during the period 27–31 October 2003 from a chain of GPS stations covering the South American sector from Imperatriz, Brazil, to Rio Grande

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43

Zhang, Yixin, Yang Liu, Junlei Mei, Chunxi Zhang, and Jinling Wang. "A Study on the Characteristics of the Ionospheric Gradient under Geomagnetic Perturbations." Sensors 20, no. 7 (2020): 1805. http://dx.doi.org/10.3390/s20071805.

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The Earth’s ionosphere is greatly influenced by geomagnetic activities, especially geomagnetic storms. During a geomagnetic storm, the ionosphere suffers many perturbations, leading to a spatial gradient that are neglected during geomagnetically quiet periods. An ionospheric gradient generates potential hazards for a ground-based argumentation system (GBAS) by enlarging the errors in the delay corrections between ground monitor stations and users. To address this problem, this work investigates the characteristics of the ionospheric gradient under geomagnetic storms. Global Navigation Satellit

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Mannucci, A. J., C. O. Ao, X. Pi, and B. A. Iijima. "The impact of large scale ionospheric structure on radio occultation retrievals." Atmospheric Measurement Techniques Discussions 4, no. 3 (2011): 2525–65. http://dx.doi.org/10.5194/amtd-4-2525-2011.

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Abstract. We study the impact of large-scale ionospheric structure on the accuracy of radio occultation (RO) retrievals of atmospheric parameters such as refractivity and temperature. We use a climatological model of the ionosphere as well as an ionospheric data assimilation model to compare quiet and geomagnetically disturbed conditions. The largest contributor to ionospheric bias is physical separation of the two GPS frequencies as the GPS signal traverses the ionosphere and atmosphere. We analyze this effect in detail using ray-tracing and a full geophysical retrieval system. During quiet c

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Bailey, Rachel L., Thomas S. Halbedl, Ingrid Schattauer, et al. "Modelling geomagnetically induced currents in midlatitude Central Europe using a thin-sheet approach." Annales Geophysicae 35, no. 3 (2017): 751–61. http://dx.doi.org/10.5194/angeo-35-751-2017.

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Abstract. Geomagnetically induced currents (GICs) in power systems, which can lead to transformer damage over the short and the long term, are a result of space weather events and geomagnetic variations. For a long time, only high-latitude areas were considered to be at risk from these currents, but recent studies show that considerable GICs also appear in midlatitude and equatorial countries. In this paper, we present initial results from a GIC model using a thin-sheet approach with detailed surface and subsurface conductivity models to compute the induced geoelectric field. The results are c

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Chi, P. J., and G. Le. "Observations of magnetospheric high‐ m poloidal waves by ST‐5 satellites in low Earth orbit during geomagnetically quiet times." Journal of Geophysical Research: Space Physics 120, no. 6 (2015): 4776–83. http://dx.doi.org/10.1002/2015ja021145.

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J. E., Thomas,, George, N. J., Ekanem, A.M, and Akpan, A. E. "IONOSPHERIC PLASMA VARIATIONS AFORE THE EAST OF KURIL ISLANDS EARTHQUAKE OF 13th JANUARY, 2007." Geological Behavior 4, no. 1 (2020): 42–46. http://dx.doi.org/10.26480/gbr.01.2020.42.46.

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Plasma Analyzer (IAP) and Langmuir Probe (ISL) experiments of the DEMETER microsatellite were used to check the state of the ionosphere in the region of the M8.1 East of Kuril Islands earthquake of 13th January, 2007,30 days afore and 10 days after the event using statistical approach. The study strongly revealed that all three investigated ionospheric parameters of electron density, total ion density and electron temperature displayed unfamiliar ionospheric variations eight days before the earthquake in the daytime time half orbit measurement. To this, the electron density, total ion density

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Jenner, Luke A., Alan G. Wood, Gareth D. Dorrian, et al. "Plasma density gradients at the edge of polar ionospheric holes: the absence of phase scintillation." Annales Geophysicae 38, no. 2 (2020): 575–90. http://dx.doi.org/10.5194/angeo-38-575-2020.

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Abstract. Polar holes were observed in the high-latitude ionosphere during a series of multi-instrument case studies close to the Northern Hemisphere winter solstice in 2014 and 2015. These holes were observed during geomagnetically quiet conditions and under a range of solar activities using the European Incoherent Scatter (EISCAT) Svalbard Radar (ESR) and measurements from Global Navigation Satellite System (GNSS) receivers. Steep electron density gradients have been associated with phase scintillation in previous studies; however, no enhanced scintillation was detected within the electron d

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Sumod, S. G., T. K. Pant, C. Vineeth, and M. M. Hossain. "A new insight into the vertical neutral-ion coupling between the mesopause and equatorial ionosphere F-region." Annales Geophysicae 29, no. 2 (2011): 421–26. http://dx.doi.org/10.5194/angeo-29-421-2011.

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Abstract. This letter reports unique observations, illustrating the vertical coupling between the daytime mesopause and F-region of the ionosphere over the magnetic dip equatorial station Trivandrum (8.5° N, 76.5° E, 0.5° N dip lat.) in India. For the "first time", it has been shown that the temporal variations in the mean daytime mesopause temperatures (MPT), during geomagnetically quiet days corroborate well with that of the base height changes (h'F) of the ionospheric F-region. However, there exist some characteristic time delays between these two, which vary from 0 to 90 min. The MPTs are

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Feshchenko, E. Y., and Y. P. Maltsev. "Erosion of the inner magnetosphere during geomagnetic storms." Annales Geophysicae 15, no. 12 (1997): 1532–36. http://dx.doi.org/10.1007/s00585-997-1532-x.

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Abstract. Using the empirical magnetic field model dependent on the Dst index and solar wind dynamic pressure, we calculated the behaviour of the contour B = Bs in the equatorial plane of the magnetosphere where Bs is the magnetic field in the subsolar point at the magnetopause. The inner domain of the magnetosphere outlined by this contour contains the bulk of geomagnetically trapped particles. During quiet time the boundary of the inner magnetosphere passes at the distance ~10 RE at noon and at ~7 RE at midnight. During very intense storms this distance can be reduced to 4–5 RE for all MLT.

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