A Case Study for Imperfect Magnetosphere-Ionosphere Coupling by STARE-TRIAD Joint Observations
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摘要: 本文用STARE-TRIAD联合观测的一个实例研究磁层-电离层不完全耦合现象.实例中观测的电场、场向电流和推出的Pederson电导率在Harang不连续区的分布与用Kan-Lee磁层-电离层不完全耦合理论的预测值符合得很好.这支持了该理论所说的在电等位U-位形低纬侧有S-位形存在以及与之相应的电离层电导率的第二增强区和电场凹陷区等现象.STARE的其他观测事实说明这些现象具有一定的普遍意义.Abstract: A case from STARE-TRIAD simultaneous observations is used to investigate the Magnetosphere-Ionosphere imperfect coupling. The latitudinal profiles of the STARE observed E-fields, the TRIADmeasured field-aligned currents and the deduced heigh-tintegrated Pederson conductivities near the Harang discontinuity are found to be in good agreement with the theoritical model of Kan and Lee. The observations support the prediction that the U-shape electric equipotential contours at the discontinuity is accompanied by a S-shape contour equatorward, which is associated with a second enhancement of height integrated Pederson conductivity and a valley in the latitudinal profiles of the ionospheric E-fields. Other samples from the STARE observations show that the results here have some universal significance.
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