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《Chinese Journal of Geophysics》 2007-06
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The response of high-latitude ionospheric convection during a southward IMF turning event

XU Liang~1,XU Ji-Sheng~1,A.V.Koustov~21 School of Electronic Information,Wuhan Univ.,Wuhan 430079,China2 Institute of Space and Atmospheric Studies,Univ.of Saskatchewan,Saskatoon,S7N 5E2,Canada  
Convection data from SuperDARN radars in the northern hemisphere are utilized to investigate the response of high-latitude ionospheric convection during a southward IMF turning event,focused on the response timescale.In this event,IMF B_z component changed from +7 nT to-8 nT in 1.5 min and had been relatively stable for 40 min before and after the IMF turning,respectively.The initial ionospheric convection response started near magnetic local noon about 3 min after the IMF turning.The response was delayed by increasing amounts away from noon.The delay of the convection response is about 6 min around dawn and dusk,and 12 min around midnight.There is no clear MLT dependence for the reconfiguration time of the convection response and such timescale is 10~14 min.
【Fund】: 国家自然科学基金项目(40504019);; 教育部地球空间环境与大地测量重点实验室开放基金资助
【CateGory Index】: P352
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