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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Statistical characteristics of electromagnetic energy transfer between the magnetosphere, the ionosphere, and the thermosphere
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Statistical characteristics of electromagnetic energy transfer between the magnetosphere, the ionosphere, and the thermosphere

机译：磁层，电离层和热层之间电磁能转移的统计特征

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摘要

We have determined. Based on 28 days of European Incoherent Scatter Common Program 1 mode I data obtained between 1989 and 1991, statistical characteristics of the energy- coupling processes between the lower thermosphere. Ionosphere, and magnetosphere through an analysis of the electromagnetic energy transfer rate J centre dot E, the Joule heating rate J centre dot E, and the mechanical energy transfer rate U centre dot (J*B) at altitudes of 125, 117, 109, and 101 km. At all altitudes the input electromagnetic energy is distributed to both Joule heating and mechanical energy. The energy distributed to Joule heating is larger than that to mechanical energy, but the latter is generally not negligible. All three rates respectively have two maxima, not in the midnight region but in the dawn and dusk. The enhancements of these rates have positive correlations with the increase of geomagnetic activity represented by the Kp index. The electromagnetic energy transfer rate is greatest at 117 km, becoming smaller with decreasing altitude. It is mostly positive but can be negative. At 117 km the mechanical energy transfer rate is considerably smaller than the electromagnetic energy transfer rate, suggesting that most of the electromagnetic energy at this altitude is converted to Joule heating and a small portion of the electromagnetic energy goes to mechanical energy. At 125 km the mechanical energy transfer rate is larger than that at 117 km. On average, 65% of the input electromagnetic energy is converted to Joule heating and 35% is converted to neutral mechanical energy. At 109 and 101 km altitude the mechanical energy transfer rate becomes negative, hence the Joule heating rate is greater than the electromagnetic energy transfer rate, suggesting that not only electromagnetic energy but also mechanical energy contribute to Joule heating.
机译：我们已经确定。根据1989年至1991年之间获得的28天的欧洲非相干散射通用程序1模式I数据，得出了较低热圈之间能量耦合过程的统计特征。通过分析海拔125、117、109处的电磁能量传递速率J中心点E，焦耳加热速率J中心点E和机械能传递速率U中心点（J * B），对电离层和磁层进行分析。和101公里。在所有海拔高度，输入的电磁能均分配给焦耳热和机械能。分配给焦耳加热的能量要大于分配给机械能的能量，但是后者通常是不可忽略的。这三个速率分别具有两个最大值，而不是在午夜区域，而是在黎明和黄昏。这些速率的提高与以Kp指数表示的地磁活动的增加呈正相关。电磁能传递速率最大为117 km，随着高度的减小而变小。它主要是正面的，但可以是负面的。在117 km处，机械能传递速率大大小于电磁能传递速率，这表明在此高度下，大部分电磁能都转换为焦耳热，而一小部分电磁能则转换为机械能。在125 km处，机械能传递速率大于在117 km处。平均而言，输入电磁能的65％转换为焦耳热，35％转换为中性机械能。在109和101 km高度处，机械能传递速率变为负值，因此焦耳加热速率大于电磁能传递速率，这表明不仅电磁能而且机械能都有助于焦耳加热。

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