Acta Scientiarum Naturalium Universitatis Pekinensis

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The Equatorial Counter Electrojet and the Electrostatic Potential Across the Polar Cap

SHEN Changshou1, ZI Minyun2   

  1. 1Department of Geophysics, Peking University, Beijing, 100871; 2The Academy of Arts of China, Beijing, 100009
  • Received:1995-06-20 Online:1995-09-20 Published:1995-09-20


沈长寿1, 资民筠2   

  1. 1北京大学地球物理系, 北京,100871;2中国艺术研究院,北京,100009

Abstract: Up to now, the equatorial counter electrojet (CEJ) is considered as an unusual phenomenon, which is caused by a special combina-tion of tidal modes, or by a local vertical wind shear or a gravity-wave at ionospheric height above the equator. This paper shows, however, under an average state given by the empirical models of IRI-90, MSIS-90 and HWM-90 for middle-and low-latitude ionospheres on geomagneticallyquiet days, the CEJ occurs frequently. On the other hand, the CEJ disappears under the effect of the electrostatic potentialacross the polar cap (the dawn-dusk electic field) driven by the magnetosphere-ionos-phere coupling.

Key words: equatorial electrojet, magnetosphere-ionosphere coupling, electrostatic potential across the polar cap

摘要: 一般认为反向赤道电集流(CEJ)是一种“非”常态现象,其起因可能是潮汐风波模的特殊组合,或赤道上空局地垂直风切或重力波的作用结果。本文表明,在中性大气和水平风经验模式给出的磁静日中低纬平均条件下,CEJ应“正常”地出现。磁层-电离层耦合产生的极盖区边界驱动势(或对流电场)则是CEJ消失的可能机制。

关键词: 赤道电集流, 磁层-电离层耦合, 极盖驱动势

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