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Relationships Between foF2 and Various Solar Activity Proxies
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SYSNO ASEP 0571310 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Relationships Between foF2 and Various Solar Activity Proxies Author(s) Laštovička, Jan (UFA-U) RID, ORCID
Burešová, Dalia (UFA-U) RID, ORCIDNumber of authors 2 Article number e2022SW003359 Source Title Space Weather-the International Journal of Research and Applications. - : Wiley
Roč. 21, č. 4 (2023)Number of pages 13 s. Language eng - English Country US - United States Keywords solar activity proxies ; ionospheric parameter foF2 ; middle latitudes ; low/equatorial latitudes Subject RIV DG - Athmosphere Sciences, Meteorology OECD category Meteorology and atmospheric sciences R&D Projects GA21-03295S GA ČR - Czech Science Foundation (CSF) Method of publishing Open access Institutional support UFA-U - RVO:68378289 UT WOS 000997416800002 EID SCOPUS 85153880674 DOI 10.1029/2022SW003359 Annotation To study ionospheric climate, to model the ionosphere (e.g., the International Reference Ionosphere—IRI) and to investigate its long-term changes and trends, solar activity proxies/indices have been used, because long and homogeneous data series of solar ionizing flux are not available. To identify the optimum solar activity proxies, we use yearly average foF2 data of 11 ionospheric stations from middle and low/equatorial latitudes of four continents over 1976–2014 and six solar activity proxies, F10.7, sunspot numbers, F30, Mg II, He II, and solar H Lyman-α flux. Mg II and F30 are found to be the best solar proxies for variability of foF2 at middle latitudes, not the usually used F10.7 or sunspot numbers. At equatorial latitudes the situation seems to be different with likely He II as the optimum solar proxy but all low/equatorial results are very preliminary. Solar activity describes 99% of the total variance of yearly foF2 and the foF2 dependence on solar proxies is highly linear at middle latitudes. The dependence of foF2 on F10.7 and sunspot numbers is significantly steeper in 1996–2014 than in 1976–1995, whereas for F30 both intervals provide the same dependence. We recommend for investigating the midlatitude yearly values of foF2 the solar proxy F30 followed by Mg II as the second one, not traditional F10.7 or sunspot numbers. Workplace Institute of Atmospheric Physics Contact Kateřina Adamovičová, adamovicova@ufa.cas.cz, Tel.: 272 016 012 ; Kateřina Potužníková, kaca@ufa.cas.cz, Tel.: 272 016 019 Year of Publishing 2024 Electronic address https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2022SW003359
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