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Stability of solar correction for calculating ionospheric trends
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SYSNO ASEP 0470983 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Stability of solar correction for calculating ionospheric trends Author(s) Laštovička, Jan (UFA-U) RID, ORCID
Burešová, Dalia (UFA-U) RID, ORCID
Kouba, Daniel (UFA-U) RID, ORCID
Križan, Peter (UFA-U) RID, ORCIDSource Title Annales Geophysicae. - : Copernicus - ISSN 0992-7689
Roč. 34, č. 12 (2016), s. 1191-1196Number of pages 6 s. Language eng - English Country DE - Germany Keywords mid-latitude ionosphere ; long-term trends ; critical frequency ; e-region ; FOF2 Subject RIV DG - Athmosphere Sciences, Meteorology R&D Projects GA15-03909S GA ČR - Czech Science Foundation (CSF) Institutional support UFA-U - RVO:68378289 UT WOS 000391490400001 EID SCOPUS 85006427785 DOI https://doi.org/10.5194/angeo-34-1191-2016 Annotation Global climate change affects the whole atmosphere, including the thermosphere and ionosphere. Calculations of long-term trends in the ionosphere are critically dependent on solar activity (solar cycle) correction of ionospheric input data. The standard technique is to establish an experimental model via calculating the dependence of ionospheric parameter on solar activity from the whole analysed data set, subtract these model data from observed data and analyse the trend of residuals. However, if the solar activity dependence changes with time, the solar correction calculated from the whole data set may result in miscalculating the ionospheric trends. To test this, data from two European ionospheric stations - Juliusruh and Slough/Chilton - which provide long-term reliable data, have been used for the period 1975-2014. The main result of this study is the finding that the solar activity correction used in calculating ionospheric long-term trends need not be stable, as was assumed in all previous investigations of ionospheric trends. During the previous solar cycle 23 and the current solar cycle 24, the solar activity correction appears to be different from that for the previous period and the Sun seems to behave in a different way than throughout the whole previous era of ionospheric measurements. In future ionospheric trend investigations the non-stability of solar activity correction has to be very seriously taken into account, because it can substantially affect calculated long-term trends of ionospheric parameters. 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 2017
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