DISTRIBUTION OF IMPULSIVE ELECTRIC FIELD IN THE NEAR EARTH PLASMA SHEET DURING STORM AND NON-STORM TIME
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摘要: Geotail卫星的电场数据被用于分析近地磁尾等离子体片中电场在磁扰动(Dst<-25nT)和磁静时(Dst>-25 nT的统计分布.结果表明,伴随着地向高速离子流,在X>-16Re以内区域出现强电场(高达 5-8 mV/m).磁扰动期间强电场的幅值较磁静时大,并且出现在更靠近地球的位置.较强和较靠近地球的强电场与磁扰动时更薄的等离子体片和更接近地球的等离子体片内边界相联系.观测结果意味着磁扰动期间的亚暴可能更有效地将高能粒子注射到环电流中.这对磁暴和亚暴的关系问题的解决有重要意义.Abstract: The electric field data obtained by the Geotail satellite in the near earth plasma sheet were used to analyze the spatial distribution of the impulsive electric field during storm （Dst ＜ -25nT) and non-storm （Dst ＞ -25 nT） time. It is shown that the strong electric field （up to 5-8mV/m） associated with the earthward fast ion flow is produced in the region earthward of -16 Re. The electric field during the storm time is stronger and occurs in the region closer to the Earth. The stronger electric field that is located closer to the Earth is in association with the thinner plasma sheet and the closer distance of the plasma sheet inner edge to the Earth. It is inferred that the substorm injection during the storm time is more efficient to inject energetic particles into the ring current.
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Key words:
- Magnetic storm /
- Near Earth plasma sheet /
- Impulsive electric field /
- Fast ion flow
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