dawn-dusk electric field meaning in English

晨昏电场

In the meantime , the new region current keeps increasing and expanding towards the night and equator side , and it eventually replaces the original region current , so the polar cap returns to a state as original with a dawn - dusk electric field
与此同时，新生的区电流不断增强并向夜侧和赤道方向延伸，最终取代原区电流，相应极盖区又恢复到原来的晨昏电场状态。
The results illustrate that in the driven magnetic reconnection process generated by the dawn - dusk electric field in the magnetotail , the transportation of magnetic helicity flux via the boundaries of the system is the direct cause of the change of the total magnetic helicity in the system
研究表明，对于由晨昏电场?生的磁尾驱动重联过程，通过系统边界输运的磁螺度通量是引起系统总磁螺度变化的直接原因。
The background interplanetary magnetic field is spiral with a vanishing south - north component , the initial ionosphere is dominated by the region field - aligned current ( fac ) and the corresponding dawn - dusk electric field , and the interplanetary shock collides with the earth along the sun - earth line
背景行星际磁场为螺旋场，南北分量为零；初始电离层由区场向电流和相应的晨昏电场所主导；行星际激波沿日地连线方向撞击地球。