Zobrazeno 1 - 10
of 1 419
pro vyhledávání: '"Ionospheric absorption"'
Autor:
Veronika Barta, Tamás Bozóki, Dávid Péter Süle, Daniel Kouba, Jens Mielich, Tero Raita, Attila Buzás
Publikováno v:
Remote Sensing, Vol 16, Iss 21, p 3975 (2024)
A novel method was developed based on the amplitude data of the EM waves measured by Digisondes to calculate and investigate the relative ionospheric absorption changes. The effect of 13 solar flares (>C8) that occurred from 4 to 10 September 2017 we
Externí odkaz:
https://doaj.org/article/1c290ae9020c441295ead4a561411293
Autor:
Attila Buzás, Daniel Kouba, Jens Mielich, Dalia Burešová, Zbyšek Mošna, Petra Koucká Knížová, Veronika Barta
Publikováno v:
Frontiers in Astronomy and Space Sciences, Vol 10 (2023)
Increased solar radiation during solar flare events can cause additional ionization and enhanced absorption of the electromagnetic (EM) waves in the ionosphere leading to partial or even total radio fade-outs. In this study, the ionospheric response
Externí odkaz:
https://doaj.org/article/d01a8886e9b94d668ae3ab380bccfa7d
Akademický článek
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Publikováno v:
Remote Sensing, Vol 14, Iss 8, p 1898 (2022)
This work proposes a new indirect method to detect the impact of solar flares on ionospheric sounding measurements, i.e., on the signal-to-noise ratio of ionospheric reflected radio signals. The method allows us to detect and characterize the ionosph
Externí odkaz:
https://doaj.org/article/bfb66d42f702423d8123832ed6fed890
Autor:
Ali Hussein Ni'ma
Publikováno v:
Al-Mustansiriyah Journal of Science, Vol 27, Iss 4 (2017)
In this study, two important ionospheric factors have been calculated, the collision frequency of electron and Deby length for a height range from 80 Km to a height approaching the maximum height of the F2 region of the ionosphere above the Earth's s
Externí odkaz:
https://doaj.org/article/88962f7e762549aaa4501aee2c932a8f
Akademický článek
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Autor:
Nielsen, Angelica S.
Military operations depend on high frequency (HF) radio communication. During a solar x-ray flare, the D-region of the ionosphere absorbs the HF radio wave energy, attenuating the signal, causing critical communication lines to fail. This research ev
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od______2778::e11274dc300845633bbaae1dbd1c71ff
https://hdl.handle.net/10945/69693
https://hdl.handle.net/10945/69693
Certain parameters of over-the-horizon radars (OTHRs) need regular adjustment to keep constant illumination of a target due to ionospheric variability. Feasible values of these parameters for an OTHR operation, namely, the ranges of operating frequen
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::11ee777e2cf0eeb9f3554b5c2446ccac
https://ieeexplore.ieee.org/document/8976077
https://ieeexplore.ieee.org/document/8976077
Publikováno v:
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS).
The objective of the Ham Radio Science Citizen Investigation (HamSCI) Personal Space Weather Station (PSWS) project is to develop a distributed array of ground-based multi-instrument nodes capable of remote sensing the geospace system. This system is
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f6ae5cba7f0b2e52640eb40b275d3fb7
https://doi.org/10.23919/ursigass51995.2021.9560441
https://doi.org/10.23919/ursigass51995.2021.9560441
Publikováno v:
2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS).
The energetic particle precipitation strongly affects the lower ionosphere, since these particles play an important role in the production of ionic pairs. Numerical simulations of ionospheric cosmic noise absorption at 30 MHz are shown, for the South
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a6cc911c1c126768715a5f25fa5454f4
https://doi.org/10.23919/ursigass51995.2021.9560414
https://doi.org/10.23919/ursigass51995.2021.9560414