On the responses of mesosphere and lower thermosphere temperatures to geomagnetic storms at low and middle latitudes
On the responses of mesosphere and lower thermosphere temperatures to geomagnetic storms at low and middle latitudes
复制标题
中低纬度中层和低热层温度对地磁暴的响应
DOI：
10.1029/2018gl078968
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Yue J.
中科院分区：
文献类型：
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作者：
Li J.;Wang W.;Lu J.Y.;Yuan T.;Yue J.
激光雷达和卫星的观测表明，在地磁暴期间，中间层和低热层区域的中、低纬度地区会出现大幅度的中性温度升高和降低。在这里，我们使用热层电离层中间层电动力学大气环流模型对风暴的中间层和低热层温度响应进行第一性原理模拟，以阐明这些变化的性质和原因。温度变化并不均匀;相反，夜间温度变化早于白天温度，高纬度地区的温度变化早于低纬度地区。此外，气温在某些地方/时间上升，在其他地方/时间下降。由于模拟的行为与观察相似，因此它提供了一个了解驱动观察到的变化的物理过程的机会。我们的分析表明，它们主要是由绝热加热/冷却，这是与垂直风造成的大气环流变化，与垂直热平流的额外贡献。
Observations from lidars and satellites have shown that large neutral temperature increases and decreases occur in the middle and low latitudes of the mesosphere and lower thermosphere region during geomagnetic storms. Here we undertake first‐principles simulations of mesosphere and lower thermosphere temperature responses to storms using the Thermosphere Ionosphere Mesosphere Electrodynamics General Circulation Model to elucidate the nature and causes of these changes. Temperature variations were not uniform; instead, nighttime temperatures changed earlier than daytime temperatures, and temperatures changed earlier at high latitudes than at low ones. Furthermore, temperatures increased in some places/times and decreased in others. As the simulation behaves similar to observations, it provides an opportunity to understand physical processes that drive the observed changes. Our analysis has shown that they were produced mainly by adiabatic heating/cooling that was associated with vertical winds resulting from general circulation changes, with additional contributions from vertical heat advection.