On the Responses of Mesosphere and Lower Thermosphere Temperatures to Geomagnetic Storms at Low and Middle Latitudes

doi:10.1029/2018GL078968

	On the Responses of Mesosphere and Lower Thermosphere Temperatures to Geomagnetic Storms at Low and Middle Latitudes
	Li, Jingyuan; Wang, Wenbin; Lu, Jianyong; Yuan, Tao; Yue, Jia; Liu, Xiao; Zhang, Kedeng; Burns, Alan G.; Zhang, Yongliang; Li, Zheng
刊名	GEOPHYSICAL RESEARCH LETTERS
	2018
卷号	45 期号:19 页码:10128-10137
ISSN号	0094-8276
DOI	10.1029/2018GL078968
英文摘要	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 producedmainly by adiabatic heating/cooling that was associated with vertical winds resulting from general circulation changes, with additional contributions from vertical heat advection. Plain Language Summary Both ground-and space-based observations have showed that storm time temperature have strong variations in the mesosphere and lower thermosphere (MLT) region. However, the possible physical mechanisms causing these storm time thermal responses have not been fully understood. Therefore, in this paper, we use the Thermosphere Ionosphere Mesosphere Electrodynamics General Circulation Model to investigate the possible mechanisms for the observed storm time temperature changes in the MLT region. As the simulation behaves similar to observations, it provides an opportunity to understand physical processes that drive the observed changes. By analyzing Thermosphere Ionosphere Mesosphere Electrodynamics General Circulation Model results, we found storm time adiabatic heating/cooling and vertical heat advection, both associated with changes in vertical winds, are the MLT-dominant heating processes in the MLT region at middle latitudes. Horizontal heat advection and radiative cooling also contribute to temperature changes, but they occur later than the other major heating terms. At middle and low latitudes, MLT changes are first seen in the vertical winds, followed by temperature changes; horizontal winds change later. The changes of vertical winds in the MLT region are associated with those occurring at higher altitudes. There is no direct contribution of auroral Joule heating and particle heating to the storm time MLT temperature changes at middle latitudes.
语种	英语
内容类型	期刊论文
源URL	[http://ir.nssc.ac.cn/handle/122/6565]
专题	国家空间科学中心_空间科学部
推荐引用方式 GB/T 7714	Li, Jingyuan,Wang, Wenbin,Lu, Jianyong,et al. On the Responses of Mesosphere and Lower Thermosphere Temperatures to Geomagnetic Storms at Low and Middle Latitudes[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(19):10128-10137.
APA	Li, Jingyuan.,Wang, Wenbin.,Lu, Jianyong.,Yuan, Tao.,Yue, Jia.,...&Li, Zheng.(2018).On the Responses of Mesosphere and Lower Thermosphere Temperatures to Geomagnetic Storms at Low and Middle Latitudes.GEOPHYSICAL RESEARCH LETTERS,45(19),10128-10137.
MLA	Li, Jingyuan,et al."On the Responses of Mesosphere and Lower Thermosphere Temperatures to Geomagnetic Storms at Low and Middle Latitudes".GEOPHYSICAL RESEARCH LETTERS 45.19(2018):10128-10137.