Abstract Comparison of the numerical simulation results with experimental data obtained aboard the CHAMP spacecraft has shown that in the eastern longitudes during the local winter period the parameters of electron temperature (Te) enhancement zone in the subauroral ionosphere undergo significant changes depending on the universal time (UT control) as a result of the formation of the shadow region, almost devoid of direct sources of ionization due to the displacement of the geographic and geomagnetic poles. Thus, in the time interval of 04–07 UT in the northern hemisphere and 16–19 UT in the southern hemisphere, a zone of increase of Te in the region of main ionospheric trough can have the greatest length and square, and take a ring-shaped configuration; in the time interval of 16–19 UT in the northern hemisphere and 04–07 UT in the southern hemisphere the length and square of Te enhancement zone decrease, and its configuration becomes crescent. The study has been carried out under the assumption that the main reason for the Te enhancement is the ring current that causes a downward heat flow from the plasmasphere.

中文翻译：

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冬季极光下电离层电子温度增强区参数的通用时间控制

摘要 数值模拟结果与 CHAMP 航天器上获得的实验数据的比较表明，在东经地区，在当地冬季期间，极光电离层电子温度（Te）增强区的参数随世界时发生显着变化（ UT 控制）作为阴影区域形成的结果，由于地理和地磁极的位移，几乎没有直接的电离源。因此，在北半球04-07 UT和南半球16-19 UT的时间间隔内，电离层主槽区Te增加的区域可以有最大的长度和平方，并取一个环形配置；在北半球 16-19 UT 和南半球 04-07 UT 的时间间隔内，Te 增强带的长度和平方减小，其构型变为新月形。该研究是在假设 Te 增强的主要原因是导致等离子体层向下热流的环形电流下进行的。