Rotation of the Earth’s plasmasphere at different radial distances
Advances in Space Research(2011)
摘要
We have studied the rotation of the plasmasphere using a large plasmaspheric notch observed by the Extreme Ultraviolet (EUV) instrument onboard the IMAGE spacecraft on 2001/173. The time scale is more than 20h. On the magnetic equatorial plane the notch extends over more than 1.5Re in radial distance. By analyzing the brightness for four annuluses at different average values of L from 2.0 to 3.25 over time, we determine the rotation rate of the plasmasphere at different radial distances. The analysis reveals that, with the increase of L, the rotation rate of the plasmasphere tends to strongly decrease on the dusk side and slightly increase on the dawn side.
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关键词
Plasmasphere,Notch,Rotation rate
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