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Artykuły w czasopismach na temat „VLF atmosphere”

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Data publikacji: 6 września 2023

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1

Biswas, Sagardweep, Subrata Kundu, Sudipta Sasmal, Dimitrios Z. Politisb, Stelios M. Potirakis, and Masashi Hayakawa. "Preseismic Perturbations and their Inhomogeneity as Computed from Ground- and Space-Based Investigation during the 2016 Fukushima Earthquake." Journal of Sensors 2023 (February 24, 2023): 1–23. http://dx.doi.org/10.1155/2023/7159204.

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We present the atmospheric anomalies instigated through seismogenic sources by a multichannel observation using ground- and satellite-based systems. This study emphasizes the seismic event which happened on the east coast of Japan, near the Fukushima Prefecture on November 21, 2016 (in UTC), with a magnitude of 6.9 and a depth of 11.4 km. We mainly focus on the atmospheric and ionospheric irregularities via acoustic and electromagnetic channels originating from earthquakes in the process of the lithosphere, atmosphere, and ionospheric coupling (LAIC) mechanism. In the acoustic channel, we stud

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Kachakhidze, M. K., Z. A. Kereselidze, and N. K. Kachakhidze. "The model of own seismoelectromagnetic oscillations of LAI system." Solid Earth Discussions 2, no. 2 (2010): 233–50. http://dx.doi.org/10.5194/sed-2-233-2010.

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Abstract. Very low frequency (VLF) electromagnetic radiation (in diapason 1 kHz – 1 MHz) in atmosphere, generated during earthquake preparation period, may be connected with linear size, characterizing incoming earthquake source. In order to argue this hypothesis very simple quasi-electrostatic model is used: local VLF radiation may be the manifestation of own electromagnetic oscillations of concrete seismoactive segments of lithosphere-atmosphere system. This model explains qualitatively well-known precursor effects of earthquakes. At the same time, it will be principally possible to forecast

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3

Kachakhidze, M. K., Z. A. Kereselidze, and N. K. Kachakhidze. "The model of self-generated seismo-electromagnetic oscillations of the LAI system." Solid Earth 2, no. 1 (2011): 17–23. http://dx.doi.org/10.5194/se-2-17-2011.

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Abstract. Very low frequency (VLF) electromagnetic radiation (in diapason 1 kHz–1 MHz) in the atmosphere, generated during an earthquake preparation period, may be connected with the linear size characterising the expected earthquake focus. In order to argue this hypothesis, a very simple quasi-electrostatic model is used: the local VLF radiation may represent the self-generated (own) electromagnetic oscillations of interactive seismoactive segments of the lithosphere-atmosphere system. This model qualitatively explains the well-known precursor effects of earthquakes. In addition, using this m

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4

Buchanan, Weston P., Maxim de Jong, Rachana Agrawal, et al. "Aerial Platform Design Options for a Life-Finding Mission at Venus." Aerospace 9, no. 7 (2022): 363. http://dx.doi.org/10.3390/aerospace9070363.

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Mounting evidence of chemical disequilibria in the Venusian atmosphere has heightened interest in the search for life within the planet’s cloud decks. Balloon systems are currently considered to be the superior class of aerial platform for extended atmospheric sampling within the clouds, providing the highest ratio of science return to risk. Balloon-based aerial platform designs depend heavily on payload mass and target altitudes. We present options for constant- and variable-altitude balloon systems designed to carry out science operations inside the Venusian cloud decks. The Venus Life Finde

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5

Zhao, Shufan, Xuhui Shen, Weiyan Pan, Xuemin Zhang, and Li Liao. "Penetration characteristics of VLF wave from atmosphere into lower ionosphere." Earthquake Science 23, no. 3 (2010): 275–81. http://dx.doi.org/10.1007/s11589-010-0723-9.

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Rodger, C. J., M. A. Clilverd, N. R. Thomson, D. Nunn, and J. Lichtenberger. "Lightning driven inner radiation belt energy deposition into the atmosphere: regional and global estimates." Annales Geophysicae 23, no. 11 (2005): 3419–30. http://dx.doi.org/10.5194/angeo-23-3419-2005.

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Abstract. In this study we examine energetic electron precipitation fluxes driven by lightning, in order to determine the global distribution of energy deposited into the middle atmosphere. Previous studies using lightning-driven precipitation burst rates have estimated losses from the inner radiation belts. In order to confirm the reliability of those rates and the validity of the conclusions drawn from those studies, we have analyzed New Zealand data to test our global understanding of troposphere to magnetosphere coupling. We examine about 10000h of AbsPAL recordings made from 17 April 2003

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7

Zhao, Shufan, Xuhui Sheng, Weiyan Pan, and Xuemin Zhang. "Penetration characteristics of VLF wave from atmosphere into the lower ionosphere." Chinese Journal of Space Science 31, no. 2 (2011): 194. http://dx.doi.org/10.11728/cjss2011.02.194.

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Srećković, Vladimir A., Desanka M. Šulić, Ljubinko Ignjatović, and Veljko Vujčić. "Low Ionosphere under Influence of Strong Solar Radiation: Diagnostics and Modeling." Applied Sciences 11, no. 16 (2021): 7194. http://dx.doi.org/10.3390/app11167194.

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Solar flares (SFs) and intense radiation can generate additional ionization in the Earth’s atmosphere and affect its structure. These types of solar radiation and activity create sudden ionospheric disturbances (SIDs), affect electronic equipment on the ground along with signals from space, and potentially induce various natural disasters. Focus of this work is on the study of SIDs induced by X-ray SFs using very low frequency (VLF) radio signals in order to predict the impact of SFs on Earth and analyze ionosphere plasmas and its parameters. All data are recorded by VLF BEL stations and the m

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9

Silber, Israel, Colin Price, and Craig J. Rodger. "Semi-annual oscillation (SAO) of the nighttime ionospheric D region as detected through ground-based VLF receivers." Atmospheric Chemistry and Physics 16, no. 5 (2016): 3279–88. http://dx.doi.org/10.5194/acp-16-3279-2016.

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Abstract. Earth's middle and upper atmosphere exhibits several dominant large-scale oscillations in many measured parameters. One of these oscillations is the semi-annual oscillation (SAO). The SAO can be detected in the ionospheric total electron content (TEC), the ionospheric transition height, the wind regime in the mesosphere–lower thermosphere (MLT), and in the MLT temperatures. In addition, as we report for the first time in this study, the SAO is among the most dominant oscillations in nighttime very low frequency (VLF) narrowband (NB) subionospheric measurements. As VLF signals are ref

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10

Silber, I., C. G. Price, and C. J. Rodger. "Semi-annual oscillation (SAO) of the nighttime ionospheric D-region as detected through ground-based VLF receivers." Atmospheric Chemistry and Physics Discussions 15, no. 21 (2015): 30383–407. http://dx.doi.org/10.5194/acpd-15-30383-2015.

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Abstract. Earth's middle and upper atmosphere exhibits several dominant large scale oscillations in many measured parameters. One of these oscillations is the semi-annual oscillation (SAO). The SAO can be detected in the ionospheric total electron content (TEC), the ionospheric transition height, the wind regime in the mesosphere-lower-thermosphere (MLT), and in the MLT temperatures. In addition, as we report for the first time in this study, the SAO is among the most dominant oscillations in nighttime very low frequencies (VLF) narrow-band subionospheric measurements. As VLF signals are refle

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11

Sheldon, W. R., J. R. Benbrook, and E. A. Bering. "Rocket investigations of electron precipitation and VLF waves in the Antarctic upper atmosphere." Reviews of Geophysics 26, no. 3 (1988): 519. http://dx.doi.org/10.1029/rg026i003p00519.

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12

Koshevaya, S., N. Makarets, V. Grimalsky, A. Kotsarenko, and R. Perez Enríquez. "Spectrum of the seismic-electromagnetic and acoustic waves caused by seismic and volcano activity." Natural Hazards and Earth System Sciences 5, no. 2 (2005): 203–9. http://dx.doi.org/10.5194/nhess-5-203-2005.

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Abstract. Modeling of the spectrum of the seismo-electromagnetic and acoustic waves, caused by seismic and volcanic activity, has been done. This spectrum includes the Electromagnetic Emission (EME, due to fracturing piezoelectrics in rocks) and the Acoustic Emission (AE, caused by the excitation and the nonlinear passage of acoustic waves through the Earth's crust, the atmosphere, and the ionosphere). The investigated mechanism of the EME uses the model of fracturing and the crack motion. For its analysis, we consider a piezoelectric crystal under mechanical stresses, which cause the uniform

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13

Kachakhidze, M. K., Z. A. Kereselidze, N. K. Kachakhidze, G. T. Ramishvili, and V. J. Kukhianidze. "In connection with identification of VLF emissions before L'Aquila earthquake." Natural Hazards and Earth System Sciences 12, no. 4 (2012): 1009–15. http://dx.doi.org/10.5194/nhess-12-1009-2012.

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Abstract. The present paper deals with an attempt to check the theoretical model of self-generated seismo-electromagnetic oscillations of LAI system on the basis of retrospective data. Application of the offered simple model enables one to explain qualitatively the mechanism of VLF electromagnetic emission initiated in the process of an earthquake preparation. Besides, the model enables us to associate telluric character geoelectric and geomagnetic perturbations incited by rock polarization and self-generated electromagnetic oscillations of lithosphere-atmosphere system. L'Aquila earthquake ta

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14

Hayakawa, Masashi, Alexander Schekotov, Jun Izutsu, Shih-Sian Yang, Maria Solovieva, and Yasuhide Hobara. "Multi-Parameter Observations of Seismogenic Phenomena Related to the Tokyo Earthquake (M = 5.9) on 7 October 2021." Geosciences 12, no. 7 (2022): 265. http://dx.doi.org/10.3390/geosciences12070265.

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Multi-parameter observations, powerful for the study of lithosphere–atmosphere–ionosphere coupling (LAIC), have been performed for a recent Tokyo earthquake (EQ) with a moderate magnitude (M = 5.9) and rather larger depth (~70 km) on 7 October 2021, in the hope of predicting the next Kanto (Tokyo) huge EQ, such as the 1923 Great Kanto EQ (with a magnitude greater than 7). Various possible precursors have been searched during the two-month period of 1 September to 31 October 2021, based on different kinds of data sets: (i) ULF (ultra-low frequency) magnetic data from Kakioka, Japan, (ii) ULF/EL

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15

КОРСАКОВ, А. А., and Н. А. СОКРУТ. "Amplitude variations of VLF radio signals of JXN and DHO transmitters received in Yakutsk during the solar eclipse June 10, 2021." Vestnik of North-Eastern Federal University, no. 1 (April 6, 2023): 29–41. http://dx.doi.org/10.25587/svfu.2023.58.22.003.

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Аннотация. Солнечное затмение оказывает влияние на верхнюю атмосферу Земли. Преимуществом такого естественного воздействия является то, что время затмения можно рассчитать заранее и подготовиться к экспериментам. Динамические процессы во время каждого затмения зависят от гелиогеофизической обстановки. Радиоволны диапазона ОНЧ способны распространяться на тысячи километров в волноводе Земля – ионосфера. Расположение ОНЧ радиотрасс определяет пространство для мониторинга нижней ионосферы (как части верхней атмосферы). Исследовались вариации амплитуд ОНЧ радиосигналов, принимаемых в Якутске от пе

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16

Neal, Jason J., Craig J. Rodger, Mark A. Clilverd, Neil R. Thomson, Tero Raita, and Thomas Ulich. "Long-term determination of energetic electron precipitation into the atmosphere from AARDDVARK subionospheric VLF observations." Journal of Geophysical Research: Space Physics 120, no. 3 (2015): 2194–211. http://dx.doi.org/10.1002/2014ja020689.

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17

Muto, F., M. Yoshida, T. Horie, M. Hayakawa, M. Parrot, and O. A. Molchanov. "Detection of ionospheric perturbations associated with Japanese earthquakes on the basis of reception of LF transmitter signals on the satellite DEMETER." Natural Hazards and Earth System Sciences 8, no. 1 (2008): 135–41. http://dx.doi.org/10.5194/nhess-8-135-2008.

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Abstract. There have been recently reported a lot of electromagnetic phenomena associated with earthquakes (EQs). Among these, the ground-based reception of subionospheric waves from VLF/LF transmitters, is recognized as a promising tool to investigate the ionospheric perturbations associated with EQs. This paper deals with the corresponding whistler-mode signals in the upper ionosphere from those VLF/LF transmitters, which is the counterpart of subionospheric signals. The whistler-mode VLF/LF transmitter signals are detected on board the French satellite, DEMETER launched on 29 June 2004. We

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18

De, S. S., B. K. De, B. Bandyopadhyay, et al. "Effects on atmospherics at 6 kHz and 9 kHz recorded at Tripura during the India-Pakistan Border earthquake." Natural Hazards and Earth System Sciences 10, no. 4 (2010): 843–55. http://dx.doi.org/10.5194/nhess-10-843-2010.

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Abstract. The outcome of the results of some analyses of electromagnetic emissions recorded by VLF receivers at 6 kHz and 9 kHz over Agartala, Tripura, the North-Eastern state of India (Lat. 23° N, Long. 91.4° E) during the large earthquake at Muzaffarabad (Lat. 34.53° N, Long. 73.58° E) at Kashmir under Pakistan have been presented here. Spiky variations in integrated field intensity of atmospherics (IFIA) at 6 and 9 kHz have been observed 10 days prior (from midnight of 28 September 2005) to the day of occurrence of the earthquake on 8 October 2005 and the effect continued, decayed gradually

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Miś, Tomasz Aleksander, and Józef Modelski. "Electrical Phenomena on Fully Airborne Vertical Electric Antennas in Extreme Weather Conditions." Energies 16, no. 1 (2022): 52. http://dx.doi.org/10.3390/en16010052.

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This is a conference extension of the paper ‘Investigation on the mature storm cloud’s electric field using long airborne antennas’. The use of vertical antennas (including the VEDs—Vertical Electric Dipoles), lifted up by aerostats to high altitudes without being anchored to the ground, presents numerous advantages in comparison with large terrestrial VLF (Very Low Frequency) antenna structures. A slow-moving floating-earth conductor—a vertical wire antenna—is subjected to intense electrification mechanisms in the atmosphere and inside the cloud layers, producing additional risks for the tran

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20

Yin, Weike, Bing Wei, and Shitian Zhang. "Full-wave method for the analysis of the radiation characteristics of a VLF source in the atmosphere." Results in Physics 15 (December 2019): 102682. http://dx.doi.org/10.1016/j.rinp.2019.102682.

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Molchanov, O. A., and M. Hayakawa. "VLF monitorig of atmosphere-ionosphere boundary as a tool to study planetary waves evolution and seismic influence." Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science 26, no. 6 (2001): 453–58. http://dx.doi.org/10.1016/s1464-1917(01)00030-7.

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Firstov, Pavel P., Evgeniy I. Malkin, Rinat R. Akbashev, et al. "Registration of Atmospheric-Electric Effects from Volcanic Clouds on the Kamchatka Peninsula (Russia)." Atmosphere 11, no. 6 (2020): 634. http://dx.doi.org/10.3390/atmos11060634.

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The paper is devoted to the description of observations over atmospheric and electric effects from volcanic eruptions on Kamchatka peninsula (Russia) and perspectives of their development. To collect information about atmospheric-electric effects accompanying the eruptions of Kamchatka volcanoes, three sensor networks and a VLF radio direction finding station are used. The World Wide Lightning Location Network (WWLLN) provides information on high-current lightning discharges that occur during the development of an eruptive cloud (EC). Variations in the electric field of the atmosphere (AEF E z

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Roldugin, V. C., M. I. Beloglazov, and G. F. Remenets. "Total ozone decrease in the Arctic after REP events." Annales Geophysicae 18, no. 3 (2000): 332–36. http://dx.doi.org/10.1007/s00585-000-0332-3.

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Abstract. Eight periods of relativistic electron precipitation (REP) with electron energies of more than 300 keV are identified from VLF data (10-14 kHz) monitored along the Aldra (Norway) - Apatity (Kola peninsula) radio trace. In these cases, anomalous ionization below 55-50 km occurred without disturbing the higher layers of the ionosphere. The daily total ozone values in Murmansk for six days before and six days after the REP events are compared. In seven of eight events a decrease in the total ozone of about 20 DU is observed. In one event of 25 March, 1986, the mean total ozone value for

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Баишев, Дмитрий, Dmitry Baishev, Сергей Самсонов, et al. "Monitoring and investigating space weather effects with meridional chain of instruments in Yakutia: a brief overview." Solar-Terrestrial Physics 3, no. 2 (2017): 25–33. http://dx.doi.org/10.12737/stp-3220175.

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The Yakutsk Meridional Chain (YMC) of IKFIA SB RAS, located along the 190° magnetic meridian, is equipped with geophysical and radiophysical instruments for monitoring space weather in northeast-ern Russia. YMC includes four basic stations in Yakutsk, Tixie, Zhigansk, and Maymaga, and six additional observation sites in Neryungri, Zyryanka, Kystatyam, Dzhardzhan, Chokurdakh, and Kotelny Island. It provides continuous monitoring of near-Earth space in order to obtain data on magnetic field variations, cosmic radio noise, VLF radiation, and ionospheric parameters in the complex upper atmosphere

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Баишев, Дмитрий, Dmitry Baishev, Сергей Самсонов, et al. "Monitoring and investigating space weather effects with meridional chain of instruments in Yakutia: a brief overview." Solnechno-Zemnaya Fizika 3, no. 2 (2017): 27–35. http://dx.doi.org/10.12737/22607.

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The Yakutsk Meridional Chain (YMC) of IKFIA SB RAS, located along the 190° magnetic meridian, is equipped with geophysical and radiophysical instruments for monitoring space weather in northeast-ern Russia. YMC includes four basic stations in Yakutsk, Tixie, Zhigansk, and Maymaga, and six additional observation sites in Neryungri, Zyryanka, Kystatyam, Dzhardzhan, Chokurdakh, and Kotelny Island. It provides continuous monitoring of near-Earth space in order to obtain data on magnetic field variations, cosmic radio noise, VLF radiation, and ionospheric parameters in the complex upper atmosphere

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Hayakawa, Masashi, Jun Izutsu, Alexander Schekotov, Shih-Sian Yang, Maria Solovieva, and Ekaterina Budilova. "Lithosphere–Atmosphere–Ionosphere Coupling Effects Based on Multiparameter Precursor Observations for February–March 2021 Earthquakes (M~7) in the Offshore of Tohoku Area of Japan." Geosciences 11, no. 11 (2021): 481. http://dx.doi.org/10.3390/geosciences11110481.

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The purpose of this paper is to discuss the lithosphere–atmosphere–ionosphere coupling (LAIC) effects with the use of multiparameter precursor observations for two successive Japanese earthquakes (EQs) (with a magnitude of around 7) in February and March 2021, respectively, considering a seemingly significant difference in seismological and geological hypocenter conditions for those EQs. The second March EQ is very similar to the famous 2011 Tohoku EQ in the sense that those EQs took place at the seabed of the subducting plate, while the first February EQ happened within the subducting plate,

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Remenets, G. F., and V. A. Shishaev. "VLF wave propagation and middle polar atmosphere as a detector of ultra-energetic relativistic electron precipitations in 1988–1992 years." Journal of Atmospheric and Solar-Terrestrial Physics 196 (December 2019): 105145. http://dx.doi.org/10.1016/j.jastp.2019.105145.

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Weber, Robert E., Janusz J. Petkowski, and Monika U. Weber. "Direct In-Situ Capture, Separation and Visualization of Biological Particles with Fluid-Screen in the Context of Venus Life Finder Mission Concept Study." Aerospace 9, no. 11 (2022): 692. http://dx.doi.org/10.3390/aerospace9110692.

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Evidence of chemical disequilibria and other anomalous observations in the Venusian atmosphere motivate the search for life within the planet’s temperate clouds. To find signs of a Venusian aerial biosphere, a dedicated astrobiological space mission is required. Venus Life Finder (VLF) missions encompass unique mission concepts with specialized instruments to search for habitability indicators, biosignatures and even life itself. A key in the search for life is direct capture, concentration and visualization of particles of biological potential. Here, we present a short overview of Fluid-Scree

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Rapoport, Yuriy G., Oleg K. Cheremnykh, Volodymyr V. Koshovy, et al. "Ground-based acoustic parametric generator impact on the atmosphere and ionosphere in an active experiment." Annales Geophysicae 35, no. 1 (2017): 53–70. http://dx.doi.org/10.5194/angeo-35-53-2017.

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Abstract. We develop theoretical basics of active experiments with two beams of acoustic waves, radiated by a ground-based sound generator. These beams are transformed into atmospheric acoustic gravity waves (AGWs), which have parameters that enable them to penetrate to the altitudes of the ionospheric E and F regions where they influence the electron concentration of the ionosphere. Acoustic waves are generated by the ground-based parametric sound generator (PSG) at the two close frequencies. The main idea of the experiment is to design the output parameters of the PSG to build a cascade sche

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Ayachi, M. "Mise au point d'une méthode de détermination de la température moyenne de la mésosphère à partir de la mesure de la vitesse de phase des ondes longues sur un trajet grande distance." Canadian Journal of Physics 71, no. 3-4 (1993): 106–14. http://dx.doi.org/10.1139/p93-016.

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The.mechanism of the Lyman α ionization of nitric oxide, which is mainly responsible for the formation of the D region, the lowest part of the ionosphere, is first briefly reviewed. From equations of the photochemical equilibrium, a model of the height distribution of the electron density is proposed as a function of the solar angle Θ and the scale height H, which is a function of the mesospheric temperature T. A method named Geoscanner based upon a set of curves that illustrate the theoretical relations between the phase of a continuous VLF radio wave for a long-distance transmission and the

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Yang, Shih-Sian, and Masashi Hayakawa. "Gravity Wave Activity in the Stratosphere before the 2011 Tohoku Earthquake as the Mechanism of Lithosphere-atmosphere-ionosphere Coupling." Entropy 22, no. 1 (2020): 110. http://dx.doi.org/10.3390/e22010110.

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The precursory atmospheric gravity wave (AGW) activity in the stratosphere has been investigated in our previous paper by studying an inland Kumamoto earthquake (EQ). We are interested in whether the same phenomenon occurs or not before another major EQ, especially an oceanic EQ. In this study, we have examined the stratospheric AGW activity before the oceanic 2011 Tohoku EQ (Mw 9.0), while using the temperature profiles that were retrieved from ERA5. The potential energy (EP) of AGW has enhanced from 3 to 7 March, 4–8 days before the EQ. The active region of the precursory AGW first appeared

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Wang, Jianguo, Si Cheng, Li Cai, et al. "Mapping Thunderstorm Electrical Structure in the Troposphere in Warm Season with VLF/LF Total Lightning Monitoring Data over the Pearl River Delta Region, China." Atmosphere 13, no. 7 (2022): 1015. http://dx.doi.org/10.3390/atmos13071015.

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Mapping the thunderstorm electrical structure could provide an effective way for lightning-sensitive facilities protection, such as aircraft and maritime assets. However, the weather radar that is normally used to forecast storms and rainfall mainly detects precipitation in the atmosphere and indicates the existence of liquid raindrops and ice particles by reflectivity. Here, we use intra-cloud events of eight thunderstorm days in the warm season, which are detected by VLF/LF Total Lightning monitoring system, to reveal the thunderstorm electrical structures in the 300 × 300 km area of the Pea

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Hudson, T. S., A. Horseman, and J. Sugier. "Diurnal, Seasonal, and 11-yr Solar Cycle Variation Effects on the Virtual Ionosphere Reflection Height and Implications for the Met Office’s Lightning Detection System, ATDnet." Journal of Atmospheric and Oceanic Technology 33, no. 7 (2016): 1429–41. http://dx.doi.org/10.1175/jtech-d-15-0133.1.

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AbstractThe virtual ionosphere reflection height variation is investigated temporally and spatially, with specific reference to the Met Office’s lightning detection network, the Arrival Time Difference Network (ATDnet). Data from this network, operating at 13.7 kHz, and a propagation model built by the Met Office based upon published theory were used to investigate this variation, specifically with regard to diurnal, seasonal, and 11-yr solar cycle variation. Variation over these temporal scales is chosen, since they correspond with variation in solar irradiance upon the earth’s atmosphere, so

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Palit, Sourav, Jean-Pierre Raulin, and Sérgio Szpigel. "Response of Earth's Upper Atmosphere and VLF Propagation to Celestial X-Ray Ionization: Investigation With Monte Carlo Simulation and Long Wave Propagation Capability code." Journal of Geophysical Research: Space Physics 123, no. 12 (2018): 10,224–10,238. http://dx.doi.org/10.1029/2018ja025992.

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Hayakawa, Masashi, Alexander Schekotov, Hiroki Yamaguchi, and Yasuhide Hobara. "Observation of Ultra-Low-Frequency Wave Effects in Possible Association with the Fukushima Earthquake on 21 November 2016, and Lithosphere–Atmosphere–Ionosphere Coupling." Atmosphere 14, no. 8 (2023): 1255. http://dx.doi.org/10.3390/atmos14081255.

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The study presents seismogenic ULF (ultra-low-frequency) wave effects, as observed at our own new magnetic observatory at Asahi (geographic coordinates: 35.770° N, 140.695° E) in Chiba Prefecture. Our target earthquake (EQ) is a huge one offshore of Fukushima prefecture (37.353° N, 141.603° E) with a magnitude (M) of 7.4, which occurred at 20.59 h on November 21 UT, 2016. As a sampling frequency of 1 Hz was chosen for our induction magnetometer, we could detect both ULF wave effects: ULF radiation from the lithosphere, and the ULF depression effect, indicative of lower ionospheric perturbation

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36

Surkov, V. V., and M. Hayakawa. "Underlying mechanisms of transient luminous events: a review." Annales Geophysicae 30, no. 8 (2012): 1185–212. http://dx.doi.org/10.5194/angeo-30-1185-2012.

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Abstract. Transient luminous events (TLEs) occasionally observed above a strong thunderstorm system have been the subject of a great deal of research during recent years. The main goal of this review is to introduce readers to recent theories of electrodynamics processes associated with TLEs. We examine the simplest versions of these theories in order to make their physics as transparent as possible. The study is begun with the conventional mechanism for air breakdown at stratospheric and mesospheric altitudes. An electron impact ionization and dissociative attachment to neutrals are discussed

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Moeckel, Chris, Imke de Pater, and David DeBoer. "Ammonia Abundance Derived from Juno MWR and VLA Observations of Jupiter." Planetary Science Journal 4, no. 2 (2023): 25. http://dx.doi.org/10.3847/psj/acaf6b.

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Abstract The vertical distribution of trace gases in planetary atmospheres can be obtained with observations of the atmosphere’s thermal emission. Inverting radio observations to recover the atmospheric structure, however, is nontrivial, and the solutions are degenerate. We propose a modeling framework to prescribe a vertical distribution of trace gases that combines a thermochemical equilibrium model with a vertical temperature structure and compare these results to models where ammonia can vary between predefined pressure nodes. We compare these model to nadir brightness temperatures and lim

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38

Marchuk, Roman, Alexander Potapov, and Vladimir Mishin. "Synchronous globally observable ultrashort-period pulses." Solar-Terrestrial Physics 8, no. 2 (2022): 47–55. http://dx.doi.org/10.12737/stp-82202207.

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We have studied the properties of impulsive geomagnetic disturbances, which are observed synchronously at the network of induction magnetometers of the Institute of Solar-Terrestrial Physics (ISTP SB RAS) and Canadian stations of the CARISMA project [Mann, et al., 2008]. A feature of the pulses we detected is that their frequency range (f~5–30 Hz) lies at the junction of the ranges of two known classes of electromagnetic oscillations: ultra-low-frequency (ULF) oscillations (f<5–10 Hz), or geomagnetic pulsations, and extra-low frequency (ELF) oscillations (f~30–300 Hz); therefore, the 5–30 H

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Singh, Raj, and Birbal Singh. "Anomalous subsurface VLF electric field changes related to India-Nepal border earthquake (M=5.3) of 4 April 2011 and their lithosphere – atmosphere coupling observed at Mathura." Journal of Atmospheric Electricity 33, no. 1 (2013): 31–39. http://dx.doi.org/10.1541/jae.33.31.

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Li, Guang Ming, Chang Jun Li, and Quan Na Li. "Research of the VLF Atmospheric Noise Statistical Prediction." Applied Mechanics and Materials 716-717 (December 2014): 1303–7. http://dx.doi.org/10.4028/www.scientific.net/amm.716-717.1303.

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The nature of the vlf atmospheric noise can have a dramatic effect on the performance of the vlf receivers. To understanding how the receivers will perform in different locations and time, the key is proper predicting the critical parameters of the vlf atmospheric noise. Based on the purpose, according to the historical data and the corresponding frequency and parameter variation chart, established the data fitting algorithm to predict the critical parameters of the vlf atmospheric noise. By simulating and comparing with the measured data, testified the effectiveness of the vlf atmospheric noi

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Marshall, R. A., U. S. Inan, T. Neubert, et al. "Optical observations geomagnetically conjugate to sprite-producing lightning discharges." Annales Geophysicae 23, no. 6 (2005): 2231–37. http://dx.doi.org/10.5194/angeo-23-2231-2005.

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Abstract. Theoretical studies have predicted that large positive cloud-to-ground discharges can trigger a runaway avalanche process of relativistic electrons, forming a geomagnetically trapped electron beam. The beam may undergo pitch angle and energy scattering during its traverse of the Earth's magnetosphere, with a small percentage of electrons remaining in the loss cone and precipitating in the magnetically conjugate atmosphere. In particular, N2 1P and N2+1N optical emissions are expected to be observable. In July and August 2003, an attempt was made to detect these optical emissions, cal

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42

Raj Pal Singh, Sarita Sharma, and Devbrat Pundhir. "Effect of VLF Electromagnetic Radiations Associated with Some Moderate Shallow Earthquakes (4.9 ≤ M ≤ 6, Depth ≤ 20 Km) on the Atmosphere as Observed in the Terrestrial Antenna at Mathura." Geomagnetism and Aeronomy 62, no. 5 (2022): 663–74. http://dx.doi.org/10.1134/s0016793222050140.

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Koshak, William J., Douglas M. Mach, and Phillip M. Bitzer. "Mitigating VHF Lightning Source Retrieval Errors." Journal of Atmospheric and Oceanic Technology 35, no. 5 (2018): 1033–52. http://dx.doi.org/10.1175/jtech-d-17-0041.1.

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AbstractThe problem of inferring the location and time of occurrence of a very high frequency (VHF) lightning source emission from Lightning Mapping Array (LMA) network time-of-arrival (TOA) measurements is closely examined in order to clarify the cause of retrieval errors and to determine how best to mitigate these errors. With regard to this inverse problem, the previous literature lacks a comprehensive discussion of the associated forward problem. Hence, the forward problem is analyzed in this study to better clarify why retrieval errors increase with increasing source horizontal range and/

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Lizunov, G. V., V. Korepanov, A. A. Lukenyuk, O. V. Piankova, and O. P. Fedorov. "SPACE PROJECT “IONOSAT – MICRO”: READINESS FOR IMPLEMENTATION." Kosmìčna nauka ì tehnologìâ 28, no. 6 (2022): 03–11. http://dx.doi.org/10.15407/knit2022.06.003.

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Ionosat-Micro is a fundamental scientific project devoted to the study of near-Earth space. The project is conceived as an answer to the challenges posed by the modern development of knowledge about Space Weather and the ionospheric responses to surface energy sources (such as weather phenomena, power lines operation, earthquakes and processes of their preparation, powerful technogenic hazards, etc.). Furthermore, the project Ionosat-Micro is a logical continuation and addition to previous ionospheric missions, such as Dynamics Explorer 2 (launched in 1982), Freja (1992), DEMETER (2004), Swarm

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Schlegel, K., and M. Füllekrug. "A D-region conductivity model from EISCAT VHF measurements." Annales Geophysicae 20, no. 9 (2002): 1439–45. http://dx.doi.org/10.5194/angeo-20-1439-2002.

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Abstract. An easy-to-use model to evaluate conductivities at high and middle latitudes in the height range 70–100 km is presented. It is based on electron density profiles obtained with the EISCAT VHF radar during 11 years and on the neutral atmospheric model MSIS95. The model uses solar zenith angle, geomagnetic activity and season as input parameters. It was mainly constructed to study the properties of Schumann resonances that depend on such conductivity profiles.Key words. Meteorology and atmospheric dynamics (middle atmospheric dynamics) – Ionosphere (modeling and forecasting; ionosphere-

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Worthington, R. M., R. D. Palmer, and S. Fukao. "<i>Letter to the Editor</i>: Complete maps of the aspect sensitivity of VHF atmospheric radar echoes." Annales Geophysicae 17, no. 8 (1999): 1116–19. http://dx.doi.org/10.1007/s00585-999-1116-z.

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Abstract. Using the MU radar at Shigaraki, Japan (34.85°N, 136.10°E), we measure the power distribution pattern of VHF radar echoes from the mid-troposphere. The large number of radar beam-pointing directions (320) allows the mapping of echo power from 0° to 40° from zenith, and also the dependence on azimuth, which has not been achieved before at VHF wavelengths. The results show how vertical shear of the horizontal wind is associated with a definite skewing of the VHF echo power distribution, for beam angles as far as 30° or more from zenith, so that aspect sensitivity cannot be assumed negl

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Worthington, R. M. "Asymmetry of atmospheric microstructure over synoptic scales." Annales Geophysicae 19, no. 8 (2001): 921–24. http://dx.doi.org/10.5194/angeo-19-921-2001.

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Abstract. Distortions are often seen in the angular distribution of echo-power from VHF wind-profiling radars, suggesting that thin stable layers, within the air flow, are distorted and tilted from horizontal. In vertical shear of the horizontal wind, the distribution of the layer tilt angles becomes skewed. A case study using six days of VHF radar data and synoptic charts above western Europe indicates that this asymmetry of atmospheric microstructure can exist throughout the troposphere and lower stratosphere, above and below the jet wind maximum, over horizontal scales of thousands of kilom

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Zhou, Jian Ping, and Guang Ming Li. "Research on the Frequency Spectrum Management Method of VLF Based on the Propagation Prediction Technology." Applied Mechanics and Materials 543-547 (March 2014): 2180–83. http://dx.doi.org/10.4028/www.scientific.net/amm.543-547.2180.

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VLF communication is one of the most effective means to command underwater platform. The spectrum resource of vlf communication is limited, so it is very important for enhance the reliability of vlf communication to strengthen the vlf communication spectrum management. It makes use of the well prediction of the vlf frequency band, to establish the signal field predicting model and atmospheric noise statistics predicting model respectively, predicts the field of signal and noise level, and then calculated the signal-to-noise ratio (SNR). According to the SNR distribution we can determine the re

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Fu, Gang, Yan Jun Wu, and Qian He. "Simulation of VLF CSS System in Atmospheric Noise." Applied Mechanics and Materials 556-562 (May 2014): 1874–78. http://dx.doi.org/10.4028/www.scientific.net/amm.556-562.1874.

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Very Low Frequency (VLF) communication is designed to operate in the frequency between 3 kHz and 30 kHz. The atmospheric noise generated by lightning phenomena is the main source of interference in VLF communications, it is rather difficult to detect the communication signal that not only merged in strong channel noise, but probably interfered by high-tension impulse caused by thunder. This paper, Alpha stable distribution noise model is proposed to simulate atmospheric noise firstly, then, we study a new technique of Chirp Spread Spectrum (CSS) communication based on Fractional Fourier Transf

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Zhang, Yijun, Yang Zhang, Mengjin Zou, et al. "Advances in Lightning Monitoring and Location Technology Research in China." Remote Sensing 14, no. 5 (2022): 1293. http://dx.doi.org/10.3390/rs14051293.

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Monitoring lightning and its location is important for understanding thunderstorm activity and revealing lightning discharge mechanisms. This is often realized based on very low-frequency/low-frequency (VLF/LF) signals, very high-frequency (VHF) signals, and optical radiation signals generated during the lightning discharge process. The development of lightning monitoring and location technology worldwide has largely evolved from a single station to multiple stations, from the return strokes (RSs) of cloud-to-ground (CG) lightning flashes to total lightning flashes, from total lightning flashe

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