Continuous Doppler sounding of the ionosphere during solar flares
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378289%3A_____%2F18%3A00498516" target="_blank" >RIV/68378289:_____/18:00498516 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1186/s40623-018-0976-4" target="_blank" >http://dx.doi.org/10.1186/s40623-018-0976-4</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1186/s40623-018-0976-4" target="_blank" >10.1186/s40623-018-0976-4</a>
Alternative languages
Result language
angličtina
Original language name
Continuous Doppler sounding of the ionosphere during solar flares
Original language description
Solar flares cause a rapid increase in ionization in the ionosphere owing to significant enhancement of ionizing solar radiation in the X-ray and extreme ultraviolet (EUV) spectral ranges. The change of electron densities in the ionosphere influences the propagation of radio waves. The ionospheric response to solar flares is investigated for three selected examples recorded during the maximum and decreasing phase of the solar cycle 24 with time resolution of several seconds by continuous Doppler sounding systems installed in the Czech Republic (50N, 14E), Taiwan (24N, 121E) and Northern Argentina (27S, 65W). The reflection heights of sounding signals are derived from nearby ionospheric sounders. The measured Doppler shifts are compared with EUV and X-ray data from the GOES-15 satellite. It is shown that the largest Doppler shifts are observed at times when the time derivatives of EUV fluxes are maximal, while the Doppler shifts are around zero at times when the EUV fluxes reach maxima. This means that loss processes balance the ionization when the EUV fluxes maximize. The attenuation of Doppler signal caused by enhanced electron density in the D and E layer was well correlated with the cosmic noise absorption measured by riometer. For large ionizing fluxes, the attenuation leads to very low signal-to-noise ratio, loss of the received signal, and inability to process both Doppler shift spectrograms and ionograms.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10305 - Fluids and plasma physics (including surface physics)
Result continuities
Project
<a href="/en/project/GA18-01969S" target="_blank" >GA18-01969S: Atmospheric waves: dynamics and vertical coupling</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Earth, Planets and Space
ISSN
1880-5981
e-ISSN
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Volume of the periodical
70
Issue of the periodical within the volume
December
Country of publishing house
DE - GERMANY
Number of pages
19
Pages from-to
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UT code for WoS article
000453753400001
EID of the result in the Scopus database
2-s2.0-85058822780