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《Chinese Journal of Geophysics》 2001-01
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ION COMPOSITION VARIATIONS IN THE RING CURRENT DURING INTENSE MAGNETIC STORMS AND THEIR RELATIONSHIP WITH EVOLUTION OF STORMS

FU SUI YAN 1,2) \ PU ZU YIN 1) \ ZONG QIU GANG 2) XIAO CHI JIE 1) \ XIE LUN 1) B.WILKEN 2) 1) Department of Geophysics,Peking University,Beijing 100871,China 2) Max Planck Institute for Agronomy,Katlenburg Lindau,Ge  
Ion composition variations in the inner magnetosphere during storm time are investigated using data set obtained from CRRES/MICS. Case study of the twin storms in July,1991 and statistical study of 12 intense storms in the same year both indicate that the storm time ring current particles can be divided into two groups:one consists of O +,low energy H + and He +,which are originated from the ionosphere (IOP),the other is composed of high energy H + and He ++ which are originated from the solar wind (SOP). It is shown that in quiet time the major particles of the ring current are SOP,whereas during the main phase of large storms the main component of the ring current particles is the IOP. Ring current particles of intense storms can be injected to low L altitudes ( L ~3-4). It is confirmed that the contribution of IOP to the ring current increases with increasing D st value. In large storms IOP are the major constituents of the ring current,even up to 80% of the total number density at the D st Maximum. There is clear evidence showing that it is the rapid enhancement and reduction of the O + flux of the ring current that leads the D st index to rapidly decrease during the main phase and to quickly recover in the early recovery phase. Further analyses indicate that during weak storms ( D st -50nT) the contribution of O + ions to the ring current is negligible. [
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【CateGory Index】: P353.1
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【Secondary References】
China Proceedings of conference Full-text Database 1 Hits
1 DU AIMIN CHEN GENGXIONG XU WENYAO HONG MINGHUA CHEN HONGFEI PENG FENGLIN Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;CHARACTERISTICS OF Pc5 ULF WAVE DURING THE MAGNETIC STORM ON JULY 15~16,2000[A];[C];2003
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