Zobrazeno 1 - 10
of 97
pro vyhledávání: '"VLF signal"'
Akademický článek
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Autor:
Aleksandra Nina
Publikováno v:
Remote Sensing, Vol 16, Iss 8, p 1330 (2024)
This study is a continuation of pilot research on the relationships between seismic activity and changes in very low frequency (VLF) signals starting a few minutes or a few dozen minutes before an earthquake. These changes are recorded in the time an
Externí odkaz:
https://doaj.org/article/7d591cf1bc12402b9b0c8539c8d1b24d
Autor:
Aleksandra Nina
Publikováno v:
Remote Sensing, Vol 16, Iss 2, p 397 (2024)
In this paper, we complete pioneering research that indicates the very low frequency (VLF) signal amplitude and phase noise reductions, and short-period wave excitations and attenuations as new potential earthquake precursors. We consider changes in
Externí odkaz:
https://doaj.org/article/dc04e255c9e5433a915d0a500d530721
Akademický článek
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Autor:
Aleksandra Nina, Pier Francesco Biagi, Sergey Pulinets, Giovanni Nico, Srđan T. Mitrović, Vladimir M. Čadež, Milan Radovanović, Marko Urošev, Luka Č. Popović
Publikováno v:
Frontiers in Environmental Science, Vol 10 (2022)
Recent research shows reductions in the VLF signal noise amplitude that begin before particular earthquakes whose epicentres are more than 100 km away from the signal propagation path. In this paper, we extend this research to studying the noise ampl
Externí odkaz:
https://doaj.org/article/14431ae816894f7da21973a8819b29a4
Publikováno v:
Leida xuebao, Vol 9, Iss 5, Pp 925-938 (2020)
The Very Low Frequency (VLF) signal of 10 kHz has strong penetrability of ground objects. Because of the antenna size, its application is limited. Therefore, it is important to study the VLF signal generation method based on appropriately sized high
Externí odkaz:
https://doaj.org/article/0705bc73be454546afd786801dd78a52
Autor:
Xudong Gu, Juan Yi, Shiwei Wang, Zejun Hu, Wei Xu, Binbin Ni, Bin Li, Fang He, Xiangcai Chen, Hongqiao Hu
Publikováno v:
Remote Sensing, Vol 15, Iss 4, p 1018 (2023)
Solar flares have a severe impact on the near-earth space environment, during which the VLF signals observed by the ground-based instrument exhibit abnormal changes. However, the similarity and differences of VLF signal responses to solar flares over
Externí odkaz:
https://doaj.org/article/e50bb1689b5f499b9ed72124a7e8d69e
Akademický článek
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Publikováno v:
Mathematics, Vol 10, Iss 22, p 4278 (2022)
Extraction of information in the form of oscillations from noisy data of natural phenomena such as sounds, earthquakes, ionospheric and brain activity, and various emissions from cosmic objects is extremely difficult. As a method for finding periodic
Externí odkaz:
https://doaj.org/article/34c534700b19453598c73bf4e73b13e2
Autor:
Yuriy Rapoport, Volodymyr Reshetnyk, Asen Grytsai, Volodymyr Grimalsky, Oleksandr Liashchuk, Alla Fedorenko, Masashi Hayakawa, Andrzej Krankowski, Leszek Błaszkiewicz, Paweł Flisek
Publikováno v:
Sensors, Vol 22, Iss 21, p 8191 (2022)
Very low frequency (VLF) signals are considered as an important tool to study ionosphere disturbances. We have studied variations in signal amplitude of the Japanese JJI transmitter received by a network of eight Japan stations. The distinctions betw
Externí odkaz:
https://doaj.org/article/944600a3d5fd46ff8c4d765b8e9adc7a