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《Chinese Journal of Geophysics》 2001-01
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NIGHTSIDE AURORAL ARCS IN HIGH LATITUDES DURING SUBSTORMS AND THEIR RELATIONSHIP WITH IMF

HONG MING HUA 1) HU HONG QIAO 2) LIU RUI YUAN 2) TANG KE YUN 1) 1) Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing\ 100101, China 2) Polar Research Institute of China, Shanghai\ 200129,China [  
Observations of all sky auroral imaging, geomagnetic field, Pi2 pulsation from Zhongshan Station and IMF data from Wind satellite have been used to investigate 7 cases of nightside auroral arcs intensification and fading in high latitudes. The characteristics of auroral arcs are as follows: All of arcs intensify briefly, and then fade lasting for 10—20min; the arcs nearly align along the Sun Earth direction with pronounced duskward drift; most of the arcs occur after the interplanetary magnetic field (IMF) turns southward corresponding to the substorm growth or expansion phase, and IMF B x 0, IMF B y 0; the dawn dusk drift of the arcs is in the opposite direction of IMF B y ; these arcs have no close relation to magnetic activities and Pi2 pulsation. The present results suggest that the brief intensification of auroral arcs may be due to IMF B x 0 which favors magnetic reconnection in the southern lobe of the magnetotail, the arc fading may be attributed to southward IMF B z , and the dawn dusk motion of the arcs may be driven by the effect of the IMF B y on the motion of the reconnection site. [
【Fund】: 国家自然科学基金项目! (4963 4 1 60 ;;4 9974 0 3 3 )
【CateGory Index】: P353
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