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地球物理学报 2009
Manifestation of the AE index in substorms on August 6, 1998
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Abstract:
Auroral electrojet index (AE) is usually used to quantitatively describe the activity of the geomagnetic field in the polar region. AE is a means to identify the level of a substorm as well. In the present paper, we analyze the characteristics of aurora, ionospheric current system and the AE index. It is noted that for the pseudo-breakup events the variations of AE (>500 nT) clearly show the sudden increase and slow decrease phases. However, aurora does not expand poleward or equatorward, and the ionospheric currents present the features of the magnetic convection. We mainly focus on investigating what time the AE could be used to identify the substorm.
