Using Temporal Relationship of Thermospheric Density With Geomagnetic Activity Indices and Joule Heating as Calibration for NRLMSISE‐00 During Geomagnetic Storms
Using Temporal Relationship of Thermospheric Density With Geomagnetic Activity Indices and Joule Heating as Calibration for NRLMSISE‐00 During Geomagnetic Storms
复制标题
DOI：
10.1029/2021sw003017
复制
发表时间：
2022-03
期刊：
影响因子：
--
通讯作者：
Xin Wang;J. Miao;Xian Lu;Ercha Aa;B. Luo;Ji Liu;Yu-chao Hong;Yuxian Wang;Tinglin Ren;Ruiyun Zeng;Chenxi Du;Siqing Liu
中科院分区：
文献类型：
--
作者：
Xin Wang;J. Miao;Xian Lu;Ercha Aa;B. Luo;Ji Liu;Yu-chao Hong;Yuxian Wang;Tinglin Ren;Ruiyun Zeng;Chenxi Du;Siqing Liu
分析了265个地磁暴期间热层密度对地磁活动指数和焦耳加热的响应，并利用2002-2008年CHAMP卫星在400公里处观测到的中性质量密度对NRLMSISE-00模式进行了定标。本文用AE指数和DST指数识别了高低纬地区的地磁活动。利用Wemer-2001电势模式和DMSP航天器计算了磁暴期间的焦耳加热及其对热层密度的影响。结果表明，随着地磁风暴的加剧，热层密度对AE和DST指数的响应时间变长。在弱风暴和中等风暴期间，密度延迟声发射指数约0-1小时，而在强风暴期间，密度延迟2-4小时。此外，DST指数和AE指数之间的时间差随着风暴的加强而增大。在弱磁暴和中等磁暴期间，DST指数对应的时间与AE指数峰值的时间相差只有1-2小时，而对于强磁暴，这一时间差增加到3-5小时。此外，对NRLMSISE-00模式的定标结果能够很好地再现风暴时的热层密度，经校正后，密度观测值与模式之间的平均相对误差(MRE)从40%下降到10%。
The responses of thermospheric densities to geomagnetic activity indices and Joule heating are analyzed during 265 geomagnetic storms and can be used to calibrate the model NRLMSISE‐00 with neutral mass density observed at 400 km based on the CHAMP satellite from 2002 to 2008. In this work, the geomagnetic activities at high and low latitudes are identified by AE indices and Dst indices. During geomagnetic storms, Joule heating and its impacts on the thermospheric density are calculated by the Weimer‐2001 electric potential model and the DMSP spacecraft. The results show that the response of thermospheric density to both AE and Dst index takes a longer time as geomagnetic storms intensify. During weak and moderate storms, density delays AE indices for about 0–1 hr, while it is 2–4 hr for intense storms. In addition, the time differences between Dst indices and AE indices increase as storms intensify. During weak and moderate geomagnetic storms, the difference in the time corresponding to Dst indices with the time when AE indices peak is only 1–2 hr, while it increases to 3–5 hr for the intense storms. Furthermore, the calibration of the NRLMSISE‐00 model results can reproduce the storm‐time thermospheric density well, with the Mean Relative Error (MRE) between density observation and model decreasing from 40% to 10% after the correction.