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| 題名: | Longitudinal variations of positive dayside ionospheric storms related to recurrent geomagnetic storms |
| 作者: | 黃健民;Dmitriev, A. V.;Huang, C.-M.;Brahmanandam, P. S.;Chang, L. C.;Chen, K.-T.;Tsai, L.-C. |
| 貢獻者: | 地球科學學院太空科學與工程學系 |
| 關鍵詞: | corotating interaction regions;high-speed solar wind streams;Ionization;Ionosphere;Ionospheric storms;Magnetic fields;recurrent magnetic storms;Solar activity;Storms;Wind speed |
| 日期: | 2013-01-01 |
| 上傳時間: | 2026-04-23 11:04:47 (UTC+8) |
| 出版者: | Wiley-Blackwell;Washington: Blackwell Publishing Ltd |
| 摘要: | 摘要： We have performed an analysis of case events and statistics of positive ionospheric storms in the dayside region of the equatorial ionization anomaly during recurrent geomagnetic storms (RGSs), which dominate in geomagnetic and ionospheric conditions on the declining phase of solar activity in 2004 to 2008. It is shown that total electron content (TEC) has a tendency to minimize before the beginning of RGSs and to peak 3 to 4 days after, i.e., on the RGS recovery phase produced by high‐intensity long‐duration continuous auroral activity. The maximum of TEC coincides with the maximum of solar wind velocity within high‐speed solar wind streams. An analysis of electron content vertical profiles, derived from two independent methods using ionosondes and Constellation Observing System for Meteorology, Ionosphere, and Climate /Formosa Satellite mission‐3 radio occultation, showed that in the maximum of an ionospheric storm on 28 March 2008, the F2 layer thickens, NmF2 increases by ~50%, and hmF2 elevates by a few tens of kilometers. The response of positive ionospheric storms to solar, heliospheric, and geomagnetic drivers reveals a prominent longitudinal asymmetry. In the longitudinal range from −90° to 90°, the solar illumination plays a major role, and in the range from 90° to −120°, the influence of heliospheric and geomagnetic drivers becomes significant. The highest correlations of the TEC enhancements with the heliospheric and geomagnetic drivers were found during December–February (r increased from ~0.3 to ~0.5). We speculate that the dynamics controlling this might result from an effect of solar zenith angle, storm time effects of thermospheric ΣO/N2 enhancement, and penetrating electric fields of interplanetary and magnetospheric origin. Key Points Recurrent magnetic storms dominate the ionospheric disturbances Positive ionospheric storms peak with the solar wind speed Magnetosphere‐ionosphere coupling is strongest at longitudes from −120° to 90°
其他題名： J. Geophys. Res. Space Physics
出版者： Washington: Blackwell Publishing Ltd
出版日期： 2013-10
出處： Journal of geophysical research : Space physics (2013 - Present), 2013-10, Vol.118 (10), p.6806-6822
資源來源： Wiley Online Library - AutoHoldings Journals
版權： 2013. American Geophysical Union. All Rights Reserved.
識別號： ISSN: 2169-9380
識別號： ISSN: 2169-9402
識別號： EISSN: 2169-9402
識別號： DOI: 10.1002/jgra.50575 |
| 顯示於類別: | [太空科學與工程學系] 期刊論文
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