弓激波模型的对比  

Comparative Study of Bow Shock Models

作　　者：周悦[1] 吕建永[1] 王明[1] 袁换只 ZHOU Yue;LüJianyong;WANG Ming;YUAN Huanzhi(Institute of Space Weather,Nanjing University of Information Science and Technology,Nanjing 210044)

机构地区：[1]南京信息工程大学空间天气研究所,南京210044

出　　处：《空间科学学报》2020年第6期990-999,共10页Chinese Journal of Space Science

基　　金：国家自然科学基金项目(U1631107,41574158,41604141);双创团队项目(2017);江苏省自然科学基金项目(BK20160952);江苏省普通高校研究生科研创新计划项目(KYLX16_0950)共同资助。

摘　　要：使用Cluster卫星的弓激波穿越数据,比较了Peredo弓激波模型、Merka弓激波模型、Chao弓激波模型和Lu弓激波模型在极端太阳风条件、偶极倾角较大和平静太阳风条件下的预测精度.结果表明:Peredo模型在极端太阳风条件和平静太阳风条件下的预测误差均较大;Merka模型在极端太阳风条件下的预测误差较大;Chao模型可以较为准确地描述平静太阳风条件下的弓激波位型,但不能准确描述偶极倾角较大时的弓激波位型;Lu模型可以同时准确描述极端太阳风条件和平静太阳风条件下的弓激波位型.The Earth's bow shock is created by the interaction of the supersonic solar wind and the magnetospheric obstacle.The bow shock is a very important interface.When the satellites pass through the bow shock,its environment will change significantly.In catastrophic space weather conditions,it will cause great damage to the satellites.Therefore,investigating the shape of the bow shock is of great significance for space weather forecast and the satellite environment monitoring.In the past few decades,many bow shock models have been built to study the relationship between solar wind and bow shock.This paper compares the Peredo model,Merka model,Chao model,and Lu model under both extreme solar wind conditions(including large dipole tilt angle)and quiet solar wind conditions.Results show that during the extreme solar wind conditions and quiet solar wind conditions,the prediction of the Peredo model has a large deviation.Merka model is not accurate during the extreme solar wind conditions.Chao model can accurately describe the bow shock under quiet solar wind conditions but with a large deviation for large dipole tilt angle conditions.Lu model can accurately descry be bow shock under both extreme solar wind conditions and quiet solar wind conditions.

关 键 词：弓激波模型 偶极倾角 极端太阳风条件 

分 类 号：P353[天文地球—空间物理学]