磁暴期间亚极光区极化流(SAPS)的DMSP观测与RAM模拟的比较研究  

Comparative study of subauroral polarization streams with DMSP observation and RAM simulation

作　　者：王慧[1,2,3] 马淑英[1] A．J．Ridley 

机构地区：[1]武汉大学电子信息学院,教育部地球空间环境与大地测量重点实验室,武汉430079 [2]中国科学院空间天气学国家重点实验室,北京100080 [3]美国密西根大学空间环境模拟研究中心

出　　处：《地球物理学报》2009年第6期1419-1428,共10页Chinese Journal of Geophysics

基　　金：国家自然科学基金项目(40604017)资助

摘　　要：亚极光区极化流(Subauroral Polarization Streams,SAPS)为快速流动的西向等离子体流,位于昏侧-子夜前亚极光区,是磁层-电离层-热层耦合的重要过程之一.本文利用密西根大学的RAM(Ring current-AtmosphereInteraction Model)模型对一次典型磁暴期间发生的SAPS事件进行了模拟,并与DMSP卫星观测值进行了比较.结果表明:模拟结果能大致反映观测现象;模拟得到的SAPS峰值速度所在纬度随磁暴时间的变化与观测值有较大差别;SAPS速度观测值在约18:00 UT和约20:00 UT左右出现两个峰值,而模拟值只有一个峰值,出现在约18:00 UT,主要原因是模型对亚暴过程的模拟存在不足.Subauroral Polarization Streams （SAPS） are fast westward plasma flows, located mainly at dusk and premidnight subauroral region. They are one of the important magnetosphere- ionosphere-thermosphere coupling processes. This work has simulated one storm time SAPS event with the Ring current-Atmosphere Interaction Model （RAM） developed by University of Michigan. The model results are compared with the DMSP observations. It shows： the model results can be comparable with the observations in general; the latitude of the modeled SAPS peak velocity differed greatly from the observations; the observed SAPS velocities have two peaks around 18 ： 00 UT and 20 ： 00 UT, while the modeled have only one peak around 18 ： 00 UT, which is due to the model＇s inability in the modeling of the substorm process.

关 键 词：亚极光区极化流 RAM模型 磁暴 亚暴 

分 类 号：P353[天文地球—空间物理学]