The onset of an auroral absorption substorm

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Abstract
In this report the features of the breakup of an auroral absorption substorm are discussed. In the longitudinal sector where the substorm breaks up, a sharp onset is preceded by weak absorption which intensifies as it moves equatorward. The maximum value of absorption after the onset depends on the intensification of the equatorward‐moving absorption preceding the breakup. On the basis of the studied substorms it seems that before the onset the weak absorption decreases having a minimum just before the onset and that at longitudes near the breakup a sharp onset can be seen without any preceding absorption, or the minimum of the absorption preceding the onset lasts longer.

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