Enhanced anti-sunward flow near local noon during a period of horizontal IMF and high solar wind velocity V_Y

WEI Yong; ZONG QiuGang; PU ZuYin; WAN WeiXing; LIU JianJun; FU SuiYan; SHI QuanQi

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Enhanced anti-sunward flow near local noon during a period of horizontal IMF and high solar wind velocity V_Y

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It is believed that a southward interplanetary magnetic field (IMF) is mainly responsible for the energy input from solar wind into the magnetosphere.This paper presents an unusual case of strong anti-sunward plasma flow (up to 2 km/s) in the polar cap ionosphere and large cross-polar cap potential (CPCP) during a period of horizontal IMF (|BZ| < 2 nT) observed by both ACE (at the L1 point) and Geotail (on the dusk flank of the magnetosheath).The CPCP is even higher than that under preceding BZ ≈-23 nT.Furthermore,GOES8 observed that the magnetosheath field turns northward as the anti-sunward plasma flow and CPCP start to increase,which implies that the magnetosheath field interacting with the Earth's magnetopause has significantly rotated and differs from the IMF observed by ACE and Geotail.In accordance with previous theoretical work,we suggest that the magnetic field line draping produces a southward magnetosheath field and enhances anti-sunward plasma flow and the CPCP.

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《中国科学通报：英文版》 |2011年第11期|1117-1122|共6页
作者
WEI Yong; ZONG QiuGang; PU ZuYin; WAN WeiXing; LIU JianJun; FU SuiYan; SHI QuanQi;
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作者单位

Beijing National Observatory of Space Environment;

Institute of Geology and Geophysics;

Chinese Academy of Sciences;

Beijing 100029;

China;

School of Earth and Space Sciences;

Peking University;

Beijing 100871;

China;

Polar Research Institute of China;

Shanghai 200136;

China;

School of Space Science and Physics;

Shandong University at Weihai;

Weihai 264209;

China;

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原文格式 PDF
正文语种 chi
中图分类电离层物理;
关键词
国际货币基金组织; 太阳风速度; 流量; CPCP; 中午; 水; 等离子流; 地球磁层;

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Enhanced anti-sunward flow near local noon during a period of horizontal IMF and high solar wind velocity V_Y

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