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《Chinese Journal of Geophysics》 2005-06
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Spatial distribution of energetic ion compositions in the plasma sheet observed by Cluster/RAPID

YANG Jian~1,FU Sui-Yan~1,LIU Wen-Long~1,RUAN Peng~1,PU Zu-Yin~1,P.Daly~2,WANG Yong-Fu~11 Institute of Space Physics and Applied Technology,Peking University,Beijing 100871,China2 Max-Planck Institute for Solar System Research,Katlenburg-Lindau,Germany  
The RAPID spectrometer(Research with Adaptive Particle Imaging Detectors) onboard Cluster provided us an opportunity to investigate the distribution of energetic ions in the plasmasheet in the energy range of 40 keV~1500 keV for protons,and 10 keV~1500 keV for helium and oxygen ions.Totally about 600-hour data have been recorded when the spacecraft cross the plasma sheet in the mid magnetotail at X=(-7~-19)(R-E(GSE).) The dependence of ion energy density on different geomagnetic activity levels indicated by Kp indices has been studied.A linear correlation of energy density with Kp has been found.The profiles of different ion energy density distributions in GES-Z direction with low Kp and high Kp are presented,respectively.The reason for the positive correlation and the profile may be the fact that the energy density increases near the current sheet,and heavier ions enhance intensely.A simplified current sheet model has been employed to demonstrate that the current sheet acceleration mechanism could be a plausible explanation for these observational results that heavier ions can remain more in the site near the central plasma sheet and obtain more energy at the same time.
【Fund】: 国家自然科学基金(40374060 40425004);; 北京大学君政本科生科研基金;; 北京市重点学科共建项目提供部分资助
【CateGory Index】: P353
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