Response of the polar electrojets in the evening sector to polar magnetic substorms
Response of the polar electrojets in the evening sector to polar magnetic substorms
复制标题
晚间极地电喷射对极地磁亚暴的响应
DOI：
10.1029/ja078i025p05559
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发表时间：
1973
影响因子：
--
通讯作者：
J. Kisabeth
中科院分区：
文献类型：
--
作者：
G. Rostoker;J. Kisabeth
几项研究已经确定，在磁层活动期间，在夜晚扇区存在向东的电射流。结果表明，这种电射流可能存在于这样一种状态，它不波动与亚暴相关的向西向电射流。然而，它也可以看出，东向的电射流可能会加强的时候，一个极地磁亚暴的发病。研究表明，傍晚部门极光区，它通常是由东向的电急流和亚暴活动期间，向西向的电急流在午夜部门加强和扩大到傍晚部门，并占据了一个狭窄的纬度制度的向极边界的东射流北部。在晚上部门的电射流的确切配置确认通过使用模型电流系统计算。结果表明，晚弧区向东电急流的增长可能是午夜亚暴扩张相开始的标志。因此，不可能把向东电急流的增长看作亚暴增长阶段的独特特征。
Several studies have established the existence of an eastward electrojet in the evening sector during periods of magnetospheric activity. It is shown that this electrojet may exist in such a state that it does not fluctuate in conjunction with the substorm-associated westward electrojet. However, it is also seen that the eastward electrojet may intensify at the time of the onset of a polar magnetic substorm. Studies of the evening sector auroral zone reveal that it is generally dominated by the eastward electrojet and that during substorm activity the westward electrojet in the midnight sector intensifies and expands into the evening sector and occupies a narrow latitudinal regime north of the poleward border of the eastward jet. The exact configuration of the electrojets in the evening sector is confirmed by using model current system calculations. It is shown that the growth of the eastward electrojet in the evening sector may be the signature of the onset of the expansive phase of a substorm in the midnight sector. Thus it is not possible to consider the growth of the eastward electrojet as a unique signature of the growth phase of a substorm.