We present and discuss observations with the AMPTE/CCE spacecraft in the near‐earth nightside magnetosphere, which show a significant enhancement of ionospheric particle presence (mainly O+) at the beginning of the substorm growth phase. Such an enhancement indicates not only an ionospheric participation in the substorm initiation, but also an active role in the substorm growth phase.
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Daglis et al. (1990) studied this question.
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