空间科学学报2012，Vol.32Issue(1)：20-24,5.
2004年12月13日IMF北向期间极区亚暴电离层电动力学特征
Electrodynamics in the Polar Ionosphere During the IMF-north Substorm on 13 December 2004
摘要
Abstract
Previous studies have shown that substorm can occur even during northward Interplanetary Magnetic Field （IMF）. However, the electrodynamics in the polar ionosphere has not been studied for this kind of events. In this paper, the KRM magnetogram-inversion algorithm, combined with the magnetic record at the north hemisphere, was utilized to deduce the distribution of the current vector, the current function, and the electric potential in the polar ionosphere during the substorm event on 13 Dec. 2004. The results show a sudden enhancement of the westward electro jet at the midnight sector after the expansion onset. The equivalent current system was characterized as a two-vortex structure at the nightside, in association with a southward electric field. All these indicate an absolutely dominant role of the unloading process at the expansion phase. The two-cell convection structure could not be found, which suggests a weak directly driven process in association with the northward IMF. The contribution of the conductivity and electric field to the enhancement of the current were also examined. The results showed that the enhancement of the conductivity is responsible for the increase of the westward electro jet.关键词
亚暴/极区电离层/电动力学/行星际磁场Key words
Substorm/Polar ionosphere/Electrodynamics/Interplanetary magnetic field分类
天文与地球科学引用本文复制引用
刘俊明,张北辰,Kamide Y,吴振森,杨惠根..2004年12月13日IMF北向期间极区亚暴电离层电动力学特征[J].空间科学学报,2012,32(1):20-24,5.基金项目
国家自然科学基金项目（40890164,40874082,41104090,40904041,41031064）,国家重点基础研究项目（2006cB806306）,国家科技支撑项目（2006BAB18806）,海洋公益性行业专项（201005017）和气象行业科研专项经费（GYHY201106011）共同资助 （）
