反向赤道电集流与极盖驱动势

一般认为反向赤道电集流是一种“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）同昌ＣＥＪ消失的可能机制。

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

Up to now , the equatorial counter electrojet (CEDis considered as an unusual phenomenon , which is caused by a special combination of tidal modes,or by a local vertical wind shear or a gravity-wave at ionospheric height above the e-quator.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 geomagnetically quiet days, the CEJ occurs frequently. On the other hand , the CEJ disappears under the effect of the electrostatic potential across the polar cap(the dawn-dusk electic field) driven by the magnetosphere-ionosphere coupling.