南极中山站极光电集流分布特征分析

CHARACTERISTIC ANALYSIS OF AURORAL ELECTROJET IN ZHONGSHAN STATION, ANTARCTIC

本文通过 1 997年在南极中山站观测的极光和所对应的地磁场扰动 ,利用 AU、AL、AE指数描述极光电集流在南极中山站的分布规律及其强度 ,我们发现东向极光电集流强度是正值 ,西向极光电集流强度是负值 ,从绝对值来说 ,西向极光电集流强度大于东向极光电集流强度。南极中山站夏季的极光电集流强度大于冬季的极光电集流。秋夏冬季节的东向极光电集流在72 0～ 1 44 0分 (世界时 1 2～ 2 4时 )的分布规律的拟合曲线类似口朝上的抛物线形 ;西向极光电集流在 72 0～ 1 44 0分这段时间的分布规律的拟合曲线类似正弦波形。了解了极光电集流在南极中山站的分布特征 ,有利于极区电离层和磁层耦合及极光动力学的研究。

From the observed aurora and corresponding disturbances of geomagnetic field,we get the distribution law and its intensity of auroral electrojet near Antarctica Zhongshan Station (AZS) described by AU AL and AE indexes. We found that the intensity of east component of auroral electrojet is positive, and the west is negative. As absolute value is concerned, the west component is greater than the east. The intensity of auroral electrojet in summer is greater than that in winter around AZS. The simulation curve of the distribution law of east component in the seasons of summer autumn and winter is like a up parabola curve between 720 and 1440 min(UT 12-24 hour). And that of the west is just like a sine wave curve. The distribution characteristic of auroral electrojet in AZS, is helpful for the studies of F layer and magnetosphere coupling in polar region and aurora dynamics.