pTC-1 observation of ion high-speed flow reversal in the near-Earth plasma sheet during substorm  

作　　者：H. RME I. DANDOURAS C. M. CARR 

机构地区：[1]Centre d'Etude Spatiale des Rayonnements, CEDEX 4, F-31028 Toulouse, France [2]The Blackett Laboratory, Imperial College London, SW7 2BW, UK

出　　处：《Science China(Technological Sciences)》2008年第10期1721-1730,共10页中国科学（技术科学英文版）

基　　金：the National Natural Science Foundation of China (Grant Nos. 40620130094, 40731054, 40704027, 40390150)

摘　　要：Based on measurements of FGM and HIA on board TC-1 at its apogee on Septem-ber 14, 2004, we analyzed the ion high-speed flows in the near-Earth plasma sheet observed during the substorm expansion phase. Strong tailward high-speed flows (Vx ～ -350 km/s) were first seen at about X ～ -13.2 RE in near-Earth magnetotail, one minute later the flows reversed from tailward to earthward. The reversal process occurred quickly after the substorm expansion onset. The near-Earth magnetotail plasma sheet was one of key regions for substorm onset. Our analysis showed that the ion flow reversal from tailward to earthward was likely to be in close relation with the substorm expansion initiation and might play an important role in trigger-ing the substorm expansion onset.Based on measurements of FGM and HIA on board TC-1 at its apogee on Septem-ber 14, 2004, we analyzed the ion high-speed flows in the near-Earth plasma sheet observed during the substorm expansion phase. Strong tailward high-speed flows (Vx ～ -350 km/s) were first seen at about X ～ -13.2 RE in near-Earth magnetotail, one minute later the flows reversed from tailward to earthward. The reversal process occurred quickly after the substorm expansion onset. The near-Earth magnetotail plasma sheet was one of key regions for substorm onset. Our analysis showed that the ion flow reversal from tailward to earthward was likely to be in close relation with the substorm expansion initiation and might play an important role in trigger-ing the substorm expansion onset.

关 键 词：near-Earth MAGNETOTAIL magnetospheric SUBSTORM plasma SHEET ION high SPEED flow 

分 类 号：P353[天文地球—空间物理学]