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| 題名: | Ionospheric and thermospheric storms at equatorial latitudes observed by CHAMP, ROCSAT, and DMSP |
| 作者: | 劉正彥;Balan, N.;Liu, J. Y.;Otsuka, Y.;Tulasi Ram, S.;Lühr, H. |
| 貢獻者: | 地球科學學院太空科學與工程學系 |
| 關鍵詞: | 550 - Earth sciences;Atmospheric sciences;Earth sciences;Earth, ocean, space;Electric fields;Equator;equatorial storms;Exact sciences and technology;Ionosphere;ionospheric storms;Latitude;Magnetism;Storms;thermospheric storms |
| 日期: | 2012-01-01 |
| 上傳時間: | 2026-04-23 11:04:24 (UTC+8) |
| 出版者: | Wiley-Blackwell;Washington, DC: Blackwell Publishing Ltd |
| 摘要: | 摘要： Analysis of the dayside electron density (Ne) and neutral mass density (N) at 400 km height measured by CHAMP during 12 intense geomagnetic storms in 2000–2004, and ion densities at 600 km and 840 km heights measured by ROCSAT and DMSP during a few of the intense storms, reveal some new aspects. Thermospheric storms (change of N) reach the equator within 1.5 to 3 hours from the main phase (MP) onset of intense storms having short and steady MPs. The responses of the equatorial ionosphere (at CHAMP) to both MPs and RPs (recovery phases) of the storms are generally opposite to those at higher latitudes. In addition to the known opposite responses during MPs, the analysis reveals that positive ionospheric storms develop at equatorial latitudes (within about ±15° magnetic latitudes) during daytime RPs, while conventional negative storms occur at higher latitudes. Ionospheric storms also extend to the topside ionosphere beyond 850 km height and are generally positive (at DMSP), especially during MPs. The positive storms around the equatorial ionospheric peak during RPs are interpreted in terms of the potential sources such as (1) zero or westward electric fields due to disturbance dynamo and/or prompt penetration, (2) plasma convergence due to the mechanical effects of storm‐time equatorward neutral winds and waves, (3) increase of atomic oxygen density and decrease of molecular nitrogen density due to the downwelling effect of the winds, and (4) photoionization. The positive storms in the topside ionosphere during MPs involve the rapid upward drift of plasma due to eastward PPEFs, reduction in the downward diffusion of plasma along the field lines, and plasma convergence due to equatorward winds and waves.
其他題名： J. Geophys. Res
出版者： Washington, DC: Blackwell Publishing Ltd
出版日期： 2012-01
出處： Journal of Geophysical Research Atmospheres, 2012-01, Vol.117 (A1), p.n/a
資源來源： Wiley Online Library
版權： Copyright 2012 by the American Geophysical Union
版權： 2015 INIST-CNRS
版權： Copyright 2012 by American Geophysical Union
識別號： ISSN: 0148-0227
識別號： ISSN: 2169-9380
識別號： ISSN: 2156-2202
識別號： EISSN: 2156-2202
識別號： EISSN: 2169-9402
識別號： DOI: 10.1029/2011JA016903 |
| 顯示於類別: | [太空科學與工程學系] 期刊論文
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