Abstract

The change in plasma pressure at the latitudes of the auroral oval before, during, and after the isolated geomagnetic substorm on December 22, 2008, were studied using data from the F13, 15, 16, and 17 DMSP satellites. One feature of the studied event was a long period of values of AL index that were close to zero. During this time, there was a more than double increase in the dynamic pressure of the solar wind. The projection of pressure maxima on the equatorial plane was carried out using models of the geomagnetic field and a model of the pressure distribution in the equatorial plane. It was shown that the maximum plasma-pressure values at the latitudes of the auroral oval increase with increasing dynamic pressure of the solar wind during the magnetically quiet period to substorm. The maximum values of the plasma pressure for the studied period are recorded during the expansion phase of the substorm. A decrease in the solar-wind dynamic pressure to values close to the values during the magnetically quiet time before the substorm was not accompanied by a drop in the plasma pressure after the substorm. The difference between the plasma pressure dynamics during an isolated substorm and the pressure dynamics during a substorm taking place during magnetic storm is discussed.

中文翻译：

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在2008年12月22日孤立的地磁亚暴之前，之中和之后，极光椭圆纬度的血浆压力变化

摘要

使用F13、15、16和17颗DMSP卫星的数据研究了2008年12月22日孤立的地磁亚暴之前，期间和之后，极光椭圆纬度的血浆压力变化。研究事件的一个特征是长期的AL值接近零的索引。在此期间，太阳风的动压增加了两倍以上。压力最大值在赤道平面上的投影是使用地磁场模型和赤道平面内的压力分布模型进行的。结果表明，在磁暴至亚暴期间，极光椭圆纬度处的最大等离子体压力值随着太阳风的动压力的增加而增加。在亚暴雨的扩展阶段记录了研究期间的等离子压力的最大值。太阳风动压力降低到接近于亚暴前的磁性静寂时间期间的值的值并没有伴随亚暴后的等离子体压力的下降。