Magnetospheric model of subauroral polarization stream
Magnetospheric model of subauroral polarization stream
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DOI：
10.1029/2005ja011135
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发表时间：
2005-09-22
影响因子：
2.8
通讯作者：
Sandel, BR
中科院分区：
文献类型：
--
作者：
Goldstein, J;Burch, JL;Sandel, BR
本文在前人对极光下极化流（SAPS）平均特性研究的基础上，提出了一个以Kp指数（Kp = 4-7）为参数的SAPS电势磁层模型。该模型将SAPS向西流动通道视为一个潜在的下降，其径向位置和宽度作为增加磁局部时间（MLT）和增加Kp的函数减小。SAPS电位下降的幅度向东减小，并随着Kp的增加而增加。模型SAPS流动通道显着改变了血浆的流动路径在下午和晚上MLT部门，并同意与早期的单事件研究，使用了一个特设的SAPS潜力，以获得良好的协议与plasmasspectroscopy观察。通过与磁层顶至极光全球探测成像仪（IMAGE）卫星上的极紫外成像仪在2001年4月1日至5月31日期间获得的等离子体层顶数据的13个间隔进行比较，对模型性能进行了测试。虽然该模型表现良好，目前的KP为基础的参数化有点粗糙，捕捉只有毛空间和时间SAPS的特点。
We present a magnetospheric model of the subauroral polarization stream (SAPS) electric potential, parameterized by Kp index (valid for Kp = 4-7), on the basis of a previous study of the average characteristics of SAPS. The model treats the SAPS westward flow channel as a potential drop whose radial location and width decrease as a function of both increasing magnetic local time (MLT) and increasing Kp. The magnitude of the SAPS potential drop decreases eastward across the nightside and increases with increasing Kp. The model SAPS flow channel significantly alters the flow paths of plasma in the afternoon and evening MLT sectors and agrees with an earlier single-event study that used an ad hoc SAPS potential to obtain good agreement with plasmasphere observations. The model performance is tested via comparison with 13 intervals of plasmapause data obtained during the period 1 April through 31 May 2001 by the extreme ultraviolet (EUV) imager on the Imager for Magnetopause-to-Aurora Global Exploration (IMAGE) satellite. Although the model performs well, the current Kp-based parameterization is somewhat crude, capturing only the gross spatial and temporal SAPS characteristics.