arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.06765physics.space-phastro-ph.EPastro-ph.SRphysics.geo-phphysics.plasm-ph
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2000-2005年期间电离层对强磁暴的响应:一个IMF钟角透视

Ionospheric response to Strong Geomagnetic Storms during 2000-2005: An IMF clock angle perspective

Sumanjit Chakraborty, Sarbani Ray, Abhirup Datta, Ashik Paul

摘要:

本文介绍了赤道电离层对2000-2005年期间(第23个太阳活动周的下降阶段)发生的11次强到强磁暴的响应。分析已使用国防气象卫星计划(DMSP)的全球离子密度图进行。观测结果表明,在91%的情况下,日落后赤道不规则性发生在行星际磁场(IMF)钟角由北向南转换后的3 h内,这说明了除了IMF Bz外,IMF By在电场瞬发穿透(PPEF)过程中所起的重要作用.这是对先前报道的(Ray等人,2015年)从南部IMF Bz穿越-10 nT产生ESF的4 h窗口。

英文摘要:

This paper presents the equatorial ionospheric response to eleven strong-to-severe geomagnetic storms that occurred during the period 2000-2005, the declining phase of the solar cycle 23. The analysis has been performed using the global ion density plots of Defense Meteorological Satellite Program (DMSP). Observations show that for about 91% of the cases, post-sunset equatorial irregularities occurred within 3h from the time of northward to southward transition of the Interplanetary Magnetic Field (IMF) clock angle, thus bringing out the importance of the role played by IMF By in the process of Prompt Penetration of Electric Field (PPEF) in addition to the IMF Bz. This is an improvement from the previously reported (Ray et al.,2015) 4h window of ESF generation from the southward IMF Bz crossing -10 nT.

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