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National Institute of Geophysics, Geodesy and Geography, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
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- PublicationOpen AccessSolar activity impact on the Earth’s upper atmosphere(2013-12)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;Kutiev, I.; National Institute of Geophysics, Geodesy and Geography, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria ;Tsagouri, I.; Institute for Space Applications and Remote Sensing, National Observatory of Athens, 15236 Mount Penteli, Greece ;Perrone, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Pancheva, D.; National Institute of Geophysics, Geodesy and Geography, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria ;Mukhtarov, P.; National Institute of Geophysics, Geodesy and Geography, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria ;Mikhailov, A.; Institute of Terrestrial Magnetism, Ionosphere, and Radio Propagation, Russian Academy of Sciences, 142190 Troitsk, Moskovskaya obl., Russia 5 Institute of Atmospheric Physics ASCR, 14131 Prague, Czech Republic 6 Institute of Communications and Navigation, German Aerospace Center, 51147 Cologne, Germany 7 Ebro Observatory, University Ramon Llull, CSIC, E-43520 Roquetes, Spain 8 Dipartimento di Fisica, Universita` degli Studi di Roma, 00185 Rome, Italy 9 Atmospheric Sounding Station ;Lastovicka, J.; Institute of Atmospheric Physics ASCR, 14131 Prague, Czech Republic ;Jakowski, N.; Institute of Communications and Navigation, German Aerospace Center, 51147 Cologne, Germany ;Buresova, D.; Institute of Atmospheric Physics ASCR, 14131 Prague, Czech Republic ;Blanch, E.; Ebro Observatory, University Ramon Llull, CSIC, E-43520 Roquetes, Spain ;Andonov, B.; National Institute of Geophysics, Geodesy and Geography, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria ;Altadill, D.; Ebro Observatory, University Ramon Llull, CSIC, E-43520 Roquetes, Spain ;Magdaleno, S.; Atmospheric Sounding Station ‘‘El Arenosillo’’, INTA, Huelva, Spain ;Parisi, M.; Dipartimento di Fisica, Universita` degli Studi di Roma, 00185 Rome, Italy ;Torta, J. M.; Ebro Observatory, University Ramon Llull, CSIC, E-43520 Roquetes, Spain; ; ; ; ; ; ; ; ; ; ; ; ; ; The paper describes results of the studies devoted to the solar activity impact on the Earth’s upper atmosphere and ionosphere, conducted within the frame of COST ES0803 Action. Aim: The aim of the paper is to represent results coming from different research groups in a unified form, aligning their specific topics into the general context of the subject. Methods: The methods used in the paper are based on data-driven analysis. Specific databases are used for spectrum analysis, empirical modeling, electron density profile reconstruction, and forecasting techniques. Results: Results are grouped in three sections: Medium- and long-term ionospheric response to the changes in solar and geomag- netic activity, storm-time ionospheric response to the solar and geomagnetic forcing, and modeling and forecasting techniques. Section 1 contains five subsections with results on 27-day response of low-latitude ionosphere to solar extreme-ultraviolet (EUV) radiation, response to the recurrent geomagnetic storms, long-term trends in the upper atmosphere, latitudinal dependence of total electron content on EUV changes, and statistical analysis of ionospheric behavior during prolonged period of solar activity. Section 2 contains a study of ionospheric variations induced by recurrent CIR-driven storm, a case-study of polar cap absorption due to an intense CME, and a statistical study of geographic distribution of so-called E-layer dominated ionosphere. Section 3 comprises empirical models for describing and forecasting TEC, the F-layer critical frequency foF2, and the height of maximum plasma density. A study evaluates the usefulness of effective sunspot number in specifying the ionosphere state. An original method is presented, which retrieves the basic thermospheric parameters from ionospheric sounding data.343 657