During severe geomagnetic storms, there are strong changes of high energy proton flux and high energy electron flux measured by high energy particle detectors in the geosynchronous orbit. Thermosphere density will follow strong changes in the LEO orbit. Generally, the thermosphere density increased by the enhancement of the solar F10.7 flux and the energy particle flux, however, which energy particles (e.g. proton or electron) and which particle energies (e.g. E > 2 MeV relativistic electrons or E < 50keV low energies electrons) plays an important role during severe geomagnetic storms. This paper discussed the relationship between severe geomagnetic storm, energy particle storm and thermosphere density from the in-situ measurement data of energy particles from GOES8, GOES11 and GOES12 high energy particle detectors (from 1997 to 2007), and the thermosphere density data from Chinese satellite-borne density detectors (in 2005). The relevant results reveal that during severe geomagnetic storms, high energy proton flux of E > 1 MeV showed strong enhancement, with the change ratio ≥ 103. After one day the thermosphere density strong enhancement follow the variations of the high energy proton flux of E > 1 MeV and between severe geomagnetic activity, high energy proton flux and thermosphere density exhibits an obvious positive correlation, that is before the severe geomagnetic storm (near 1 day), the high energy proton flux showed strong enhancement in the geosynchronous orbit, and after the severe geomagnetic storm (delay 3~6h), the thermosphere density obviously increases.%利用1997-2007年由GOES8,GOES11和GOES12星载高能粒子探测器在地球同步轨道高度上所探测到的高能质子和高能电子通量探测数据以及高度560km左右星载大气密度探测器所得的热层大气密度探测数据,统计分析了强地磁扰动、高能粒子通量跃变和热层大气密度涨落之间的相关关系,初步获得强地磁扰动期间,地球同步轨道(外辐射带外环)均出现了增幅大于三个数量级的高能质子通量(尤其是E＞ 1MeV)强增强现象,随后热层大气密度强烈上涨,表明三者之间是正相关关系.在时间上地球同步轨道高能质子通量强增强现象先于日均Ap值(地磁活动程度)上涨约一天左右,而热层大气密度强涨落现象又明显滞后于强地磁扰动事件.
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