Distribution of ionospheric O^+ ion in synchronous altitude region  

作　　者：史建魁 刘振兴 ZHANGT.L. 郭兼善 张满莲 尚社平 罗熙贵 

机构地区：[1]Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100080, China [2]Space Research Institute, Austrian Academy of Sciences, Graz,A-8042, Austria

出　　处：《Science China Earth Sciences》2003年第10期986-993,共8页中国科学（地球科学英文版）

基　　金：the National Natural Science Foundation of China(Grant Nos.40074042,40025413).

摘　　要：Based on satellite observation data, using dynamics equation, the ionospheric O+ ions distribution in the synchronous altitude region for different geomagnetic activity index Kp is studied by theoretical modeling and numerical analyzing, and semi-empirical models for the O+ ions den-sity and flux versus longitude in the synchronous altitude region for different Kp are given. The main results show that in the synchronous altitude region: (i) The O+ ions density and flux in day-side are larger than those in nightside. (ii) With longitude changing, the higher the geomagnetic activity index Kp is, the higher the O+ ions density and flux, and their variation amplitude will be. The O+ ions density and flux when Kp ≥ 6 will be about ten times as great as that when Kp = 0. (iii) When Kp = 0 or Kp ≥ 6, the O+ ions density reaches maximum at longitudes 120°and 240°respectively, and minimum in the magnetotail. When Kp = 3—5, the O+ ions density gets to maxi-mum at longitude 0°, and minimum in the magnetotail. However, the O+ ions flux reaches maxi-mum at longitude 120°and 240°respectively, and minimum in the magnetotail for any Kp value.Based on satellite observation data, using dynamics equation, the ionospheric O+ ion’s distribution in the synchronous altitude region for different geomagnetic activity indexK p is studied by theoretical modeling and numerical analyzing, and semi-empirical models for the O+ ion’s density and flux versus longitude in the synchronous altitude region for differentK p are given. The main results show that in the synchronous altitude region: (i) The O+ ion’s density and flux in day-side are larger than those in nightside. (ii) With longitude changing, the higher the geomagnetic activity indexK p is, the higher the O+ ion’s density and flux, and their variation amplitude will be. The O+ ion’s density and flux whenK p ≥ 6 will be about ten times as great as that whenK p = 0. (iii) WhenK p = 0 orK p ≥ 6, the O+ ion’s density reaches maximum at longitudes 120° and 240° respectively, and minimum in the magnetotail. WhenK p = 3?5, the O+ ion’s density gets to maximum at longitude 0°, and minimum in the magnetotail. However, the O+ ion’s flux reaches maximum at longitude 120° and 240° respectively, and minimum in the magnetotail for anyK p value.

关 键 词：IONOSPHERIC O+ion  SYNCHRONOUS altitude  longitude  DISTRIBUTION features. 

分 类 号：P353[天文地球—空间物理学]