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Fig. 1

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From bottom to top: evolution of the geomagnetic indices Dst, aa, and Ca, and of the flux of electrons in the radiation belts for the E ≥ keV energy range, measured by the SEM instrument aboard the POES-15 spacecraft a) from 24 September to 8 October 1998 during a period that displayed an ICME-induced disturbance starting on 25 September 1998, and b) from 7 October to 21 October 1999 during a period that displayed a SIR-induced disturbance starting on 9 October 1999.

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