Latitudinal Impacts of Joule Heating on the High‐Latitude Thermospheric Density Enhancement During Geomagnetic Storms
Latitudinal Impacts of Joule Heating on the High‐Latitude Thermospheric Density Enhancement During Geomagnetic Storms
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DOI：
10.1029/2020ja028747
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发表时间：
2021-06
期刊：
影响因子：
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通讯作者：
Xin Wang;J. Miao;Xian Lu;Ercha Aa;Ji Liu;Yuxian Wang;Siqing Liu
中科院分区：
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作者：
Xin Wang;J. Miao;Xian Lu;Ercha Aa;Ji Liu;Yuxian Wang;Siqing Liu
我们研究了2002年1月至2008年12月期间265个地磁暴的热层对焦耳加热的纬度响应。400公里处的总质量密度增强是由具有挑战性的小卫星有效载荷(CHAMP)和重力恢复和气候实验(GRACE)卫星产生的，具有时间和空间覆盖。我们利用国防气象卫星计划(DMSP)航天器的数据和Wemer-2001风暴电势模式研究了焦耳加热及其对热层密度的影响。结果表明，在地磁暴期间，焦耳加热可以使高纬度地区的热层密度增加。此外，在弱磁暴和中磁暴期间，强焦耳加热对应的纬度与高纬度热层密度增强的纬度相差仅为0°-10°，而强磁暴对应的纬度差增加到10°-15°。此外，对于较强的地磁暴，LT中的峰值密度增强更接近于峰值焦耳加热。
We investigate the thermosphere latitudinal response to Joule heating from 265 geomagnetic storms during the period of January 2002 to December 2008. The total mass density enhancements at 400 km are derived from the Challenging Minisatellite Payload (CHAMP) and the Gravity Recovery and Climate Experiment (GRACE) satellites with temporal and spatial coverage. We examine Joule heating and its influence on the thermospheric density using data from the Defense Meteorological Satellite Program (DMSP) spacecraft and Weimer‐2001 electric potential model for storms. The results show that during geomagnetic storms, Joule heating can cause the thermospheric density to enhance in the higher‐latitude areas. In addition, during weak and moderate geomagnetic storms, the difference in the latitude corresponding to strong Joule heating with the latitude where high‐latitude thermospheric density enhances is only 0°–10° latitudes, while increases to 10°–15° for the intense storms. Besides, it is found that the peak density enhancement in LT is closer to peak Joule heating for more intense geomagnetic storms.