Dynamics of polar boundary of the auroral oval derived from the IMAGE satellite data

被引:0
作者
R. Lukianova
A. Kozlovsky
机构
[1] Arctic and Antarctic Research Institute,Space Research Institute
[2] Russian Academy of Sciences,Sodankyla@ Geophysical Observatory
[3] University of Oulu,undefined
来源
Cosmic Research | 2013年 / 51卷
关键词
Magnetic Storm; Cosmic Research; Auroral Oval; Night Side; Polar Boundary;
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学科分类号
摘要
Based on a new database on positions of the auroral oval boundaries including measurements made by the IMAGE satellite in 2000–2002 with correct determination of the glow boundaries, statistical estimations of the latitudinal position of the polar cap boundary (PCB) are obtained depending on the IMF By and Bz, and the PCB evolution during a magnetic storm is analyzed. At zero IMF in the noon (midnight) sector, PCB is located approximately at 80° (76°) CGMLat. The PCB displacement along the noon-midnight meridian is controlled by the IMF Bz, and in the noon (midnight) sector it is equal to 0.45° (0.15°) CGMLat when Bz changes by 1 nT. The PCB displacement along the dawn-dusk meridian depends on the IMF By, and it equals 0.1° CGMLat when By changes by 1 nT. Accordingly, the north polar cap as a whole is shifted to the dawn (dusk) side at By > 0 (By<0). After northward turn of the IMF during the storm’s recovery phase, the PCB on the dayside is shifted to the north practically without time delay. The night boundary requires 25 h or more in order to be shifted to the pole to a latitude corresponding to Bz > 0.
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页码:46 / 53
页数:7
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