中文摘要：

亚极光区极化流（Subauroral Polarization Streams，SAPS）为快速流动的西向等离子体流，位于昏侧一子夜前亚极光区，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—Atmosphere Interaction 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18：00UT和约20：00UT左右出现两个峰值，而模拟值只有一个峰值，出现在约18：00UT，主要原因是模型对亚暴过程的模拟存在不足．

英文摘要：

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.