A Space Hurricane over the Earth’s Polar Ionosphere
编号:183 稿件编号:743 访问权限:仅限参会人 更新:2021-06-15 16:21:24 浏览:905次 特邀报告

报告开始:2021年07月10日 13:30 (Asia/Shanghai)

报告时间:20min

所在会议:[S9B] 9B、行星科学与空间物理 » [S9B-1] 9B、行星科学与空间物理-1

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摘要
In Earth’s low atmosphere, hurricanes are destructive due to their great size, strong spiral winds with shears, and intense rain/precipitation. However, disturbances resembling hurricanes have not been detected in Earth’s upper atmosphere. Here we report a long-lasting space hurricane in the polar ionosphere and magnetosphere during low solar and otherwise low geomagnetic activity. This hurricane shows strong circular horizontal plasma flow with shears, a nearly zero-flow center, and a coincident cyclone-shaped aurora caused by strong electron precipitation associated with intense upward magnetic field-aligned currents. Near the center, precipitating electrons were substantially accelerated to ~10 keV. The hurricane imparted large energy and momentum deposition into the ionosphere despite otherwise extremely quiet conditions. The observations and simulations reveal that the space hurricane is generated by steady high-latitude lobe magnetic reconnection and current continuity during a several hour period of northward interplanetary magnetic field and very low solar wind density and speed.
 
关键字
Aurora,Space hurricane,Magnetosphere-ionosphere coupling,Polar ionosphere
报告人
张清和
山东大学

稿件作者
张清和 Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai, Shandong, China
ZhangYongliang The Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland, USA
王赤 State Key Laboratory of Space Weather, Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing, China.
OksavikKjellmar Birkeland Centre for Space Science, Department of Physics and Technology, University of Bergen, Bergen, Norway
LyonsLarry R. Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, CA, USA
LockwoodMichael Department of Meteorology, University of Reading, Reading, UK
杨惠根 Ministry of Natural Resources Key Laboratory of Polar Science, Polar Research Institute of China, Shanghai, PR China
唐斌斌 中国科学院国家空间科学中心
MoenJøran Idar Department of Physics, University of Oslo, Blindern, Oslo, Norway
邢赞扬 Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai, Shandong, China
马羽璋 Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai, Shandong, China
王翔宇 Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai, Shandong, China
宁亚飞 School of Microelectronic, Shandong University, Jinan, Shandong, China
夏利东 Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai, Shandong, China
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