COSMIC observations of dayside total electron content enhancements in response to moderate disturbances in the solar wind

NCU Institutional Repository > 地球科學學院 > 太空科學研究所 > 期刊論文 > Item 987654321/50436

jsp.display-item.identifier=請使用永久網址來引用或連結此文件: http://ir.lib.ncu.edu.tw/handle/987654321/50436

题名:	COSMIC observations of dayside total electron content enhancements in response to moderate disturbances in the solar wind
作者:	Lai,PC;Lin,CS;Burke,WJ;Huang,CM;Chen,MQ
贡献者:	太空科學研究所
关键词:	TRANSPOLAR POTENTIAL SATURATION;GREAT MAGNETIC STORM;HILL MODEL;MARCH 1989;FIELD;IONOSPHERE;PENETRATION;EXPLORER;STREAMS;SYSTEM
日期:	2011
上传时间:	2012-03-27 17:31:52 (UTC+8)
出版者:	國立中央大學
摘要:	We have analyzed measurements from the Constellation Observing System for Meteorology, Ionosphere and Climate (COSMIC) satellites acquired during an 81 day interval in late 2007 to study total electron content (TEC) responses of the dayside ionosphere during three consecutive passes of a high-speed stream (HSS) in the solar wind by Earth. During the second encounter the HSS arrival was closely preceded by the arrival at the first Lagrange point L(1) of an interplanetary coronal mass ejection (ICME). In all cases the corotating interaction region (CIR) at the HSS's leading edge was characterized by increases in both n(SW) and T(P) above predisturbance levels, and large-amplitude oscillations in all interplanetary magnetic field (IMF) components. The solar wind events induced moderate magnetic storm activity; the minimum Dst of -71 nT occurred during the second encounter. TEC enhancements appeared at low-magnetic to midmagnetic latitudes during the ICME/CIR-driven storm. Some increases exceeded quiet time values by factors of similar to 110%. In the absence of local auroral electron precipitation to create new plasma in the magnetic latitude domain of COSMIC measurements, the detected TEC increases must reflect transport effects. The COSMIC main phase observations of dayside TEC enhancement are explained as being caused by an ionospheric storm time "fountain" effect driven by weak (<1 mV/m) penetration electric fields. Our observations suggest that penetration dawn-to-dusk electric fields cause plasma to drift upward and toward higher latitudes. Plasma and field measurements from the Advanced Composition Explorer (ACE) allow estimates of penetration electric fields that we mapped to the ionosphere to calculate plasma transport velocities. We argue that observed TEC dynamics reflect the interplay between storm time transport and the production/loss histories of plasma parcels as they rotate around Earth.
關聯:	JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
显示于类别:	[太空科學研究所 ] 期刊論文

文件中的档案:

档案	描述	大小	格式	浏览次数
index.html		0Kb	HTML	844	检视/开启

在NCUIR中所有的数据项都受到原著作权保护.

社群 sharing

数据加载中.....