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《Chinese Journal of Geophysics》 2009-07
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Polar ionospheric responses to 4-times rapid turnings of the IMF B_z component—EISCAT/ESR radar observations

CAI Hong-Tao~(1,2),MA Shu-Ying~(1,2),I.W.McCrea~3,J.A.Davis~3,M.Lockwood~3,S.E.Milan~41 School of Electronic Information,Wuhan University,Wuhan 430079,China2 Key Laboratory of Geospace Environment and Geodesy,CNEM,Wuhan University,Wuhan 430079,China3 Space Science and Technique Department,Rutherford Appleton Laboratory,Chilton,Oxfordshire,OX11 0QX,UK4 Department Physics and Astronomy,University of Leicester,UK  
With the observations from EISCAT/ESR radar on Feb. 12 2003, the responses of polar ionosphere, especially those of the cusp/cleft region to the 4 times rapid turnings of IMF B_z component are investigated in this paper. During this event, latitudinal location of the cusp/cleft region was found moving back and forth, likely resulted from the variations of the reeonnection sites at the magnetopause which are widely accepted to be ruled by the IMF polarity. Meanwhile, polar ionospheric plasma convection reversed several times, exhibiting strong correlation with the signs of the IMF B_z component. Correlative and timing analysis suggest that the dayside magnetosphere-ionosphere system seems to need an average reconfiguration time of approximate 3 minutes in response to the variations of the IMF polarity in polar region.
【Fund】: 国家自然科学基金项目(40874079);; 国家科技支撑计划重点项目(2006BAB18B06)资助.
【CateGory Index】: P352.7
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