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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Redistribution of H atoms in the upper atmosphere during geomagnetic storms
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Redistribution of H atoms in the upper atmosphere during geomagnetic storms

机译：在地磁风暴期间，在高层大气中重新分布H原子

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摘要

Geocoronal H emission data acquired by NASA's Thermosphere Ionosphere Mesosphere Energetics and Dynamics mission are analyzed to quantify the H density distribution over the entire magnetosphere-ionosphere-thermosphere region in order to investigate the response of the atmospheric system as a whole to geomagnetic storms. It is shown that at low and middle latitudes the H density averaged over storm times in the thermosphere-exosphere transition region decreases by similar to 30%, while the H density at exospheric altitudes above similar to 1-2 R-E increases by up to similar to 40% relative to quiet times. We postulate that enhanced ion-neutral charge exchange in the topside ionosphere and inner plasmasphere is the primary driver of the observed H redistribution. Specifically, charge exchange reactions between H atoms and ionospheric/plasmaspheric O+ lead to direct H loss, while those between thermal H and H+ yield kinetically energized H atoms which populate gravitationally bound satellite orbits. The resulting H density enhancements in the outer exosphere would enhance the charge exchange rates in the ring current and the associated energetic neutral atom production. Regardless of the underlying mechanisms, H redistribution should be considered as an important process in the study of storm time atmospheric evolution, and the resultant changes in the geocoronal H emissions potentially could be used to monitor geomagnetic storms.
机译：通过NASA的热圈电离层肌间圈能量和动力学任务获得的地理罗隆H发射数据进行分析，以量化整个磁层电离层 - 热层区域的H密度分布，以研究大气系统整体对地磁风暴的响应。结果表明，在低和中纬度地区，在热层 - 外层过渡区域中的暴风雨时间平均值的H密度随着30％而降低，而高于上述高于1-2的高度的H密度增加到1-2重新增加40％相对于安静时间。我们假设顶部电离层和内部覆膜中增强的离子中性电荷交换是观察到的H再分配的主要驱动因素。具体地，H原子和电离层/阶段间体o +之间的电荷交换反应导致H导致H损失，而热H和H +之间的那些在填充引力齐全的卫星轨道之间的动力学通电H原子。外部外层的所得H密度增强将增强环电流的电荷交换率和相关的能量中性原子产生。无论潜在的机制如何，H重新分配都应被视为雨尘时间大气演变研究中的一个重要过程，并且可以使用地理典官H排放的所产生的变化来监测地磁风暴。

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