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Parisi, M.
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Parisi, M.
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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 - PublicationRestrictedStudy on solar sources and polar cap absorption events recorded in Antarctica(2009-06-02)
; ; ; ; ; ;Perrone, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Parisi, M.; Dipartimento di Fisica, Università degli Studi di Roma Tre, Via della Vasca Navale 84, 00146 Roma, Italy ;Meloni, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Damasso, M.; Dipartimento di Fisica, Università degli Studi di Roma Tre, Via della Vasca Navale 84, 00146 Roma, Italy ;Galliani, M.; Dipartimento di Fisica, Università degli Studi di Roma Tre, Via della Vasca Navale 84, 00146 Roma, Italy; ; ; ; Particularly intense events occurred on the Sun in a period around minimum of solar activity during cycle 23. We investigated the characteristics of September 2005 and December 2006 events and the properties of the correlated observations of ionospheric absorption, obtained by a 30 MHz riometer installed at Mario Zucchelli Station (MZS-Antarctica), and of geomagnetic activity recorded at Scott Base (Antarctica). Solar events are studied using the characteristics of CMEs measured with SoHO/LASCO coronagraphs and the temporal evolution of solar energetic protons in different energy ranges measured by GOES 11 spacecraft. Analysing these data, we have determined how these effects are finally observed on the Earth’s surface not only in the ionospheric absorption of radio waves and in the intense geomagnetic activity, but also as significant variations of cosmic ray modulation, even at high energies.161 27