Solar activity impact on the Earth’s upper atmosphere
National Institute of Geophysics, Geodesy and Geography, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
2 Institute for Space Applications and Remote Sensing, National Observatory of Athens, 15236 Mount Penteli, Greece
3 Istituto Nazionale di Geofisica e Vulcanologia, 00143 Rome, Italy
4 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, Università degli Studi di Roma, 00185 Rome, Italy
9 Atmospheric Sounding Station “El Arenosillo”, INTA, Huelva, Spain
* Corresponding author: e-mail: email@example.com
Accepted: 5 February 2013
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 geomagnetic 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.
Key words: ionosphere / solar activity / storm / total electron content / data analysis
© I. Kutiev et al., Published by EDP Sciences 2013
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.