木卫一等离子体环中冷热离子的轨迹  

The tracks of cold/hot ions in the Io plasma torus

作　　者：杨亚芬[1] 陈出新[1] 

机构地区：[1]中国科学院基础等离子体物理重点试验室中国科学技术大学地球和空间科学学院,安徽合肥230026

出　　处：《中国科学技术大学学报》2007年第8期868-872,共5页JUSTC

基　　金：国家自然科学基金(40674092;40474063)资助

摘　　要：通过模拟木卫一等离子体环中冷热离子的轨迹来分析离心力对冷热离子作用的大小,说明冷离子在离心力的约束下沿着磁力线来回反射,不可能进入木星大气层,而离心力对热离子运动的影响不大.木卫一等离子体环主要由高密度的冷等离子体组成,因此还需要一个能使冷离子离开木卫一等离子体环进入木星大气层的机制,使它能够引发木卫一尾迹极光的发射.The effect of the centrifugal force on cold/hot ions was analyzed through simulating the tracks of the cold/hot ions in the Io plasma torus. It is confirmed that cold ions reflected along, the magnetic field line under the action of the centrifugal force in the Io plasma torus cannot enter Jupiter s atmosphere, and hot ions are not affected very well by the centrifugal force. The Io plasma torus consists chiefly of high dense cold plasma, a mechanism is thus needed for cold ions to enter Jupiter＇s atmosphere and trigger the emissions of Io＇s wake.

关 键 词：冷热离子 木星磁层 木卫一等离子体环 木卫一尾迹极光 

分 类 号：P354[天文地球—空间物理学]