Abstract
AbstractThe time and energy response characteristics of relativistic (MeV) electron‐flux enhancement events during geosynchronous orbit are analyzed and compared to interplanetary disturbances and Gemagnetic storms using high resolving data for satellite GOES‐9 electron fluxes and spacecraft ACE solar‐wind parameters in April–May 1998. The results show that there was a daily variation for the MeV electron flux during the geosynchronous orbit, the maximum flux at about noon and minimum flux at about midnight. In two great events starting during the geosynchronous orbit on April 22 and May 5, 1998, rising time scales of the noon maximum flux up to the peak flux of energy > 2MeV electrons lasted about 4 days and 1 day, respectively. The continued times of noon maximum fluxes (greater than background level) are 13 days (from April 22 to May 4) and 16 days (from May 5 to 20), respectively. Energetic ranges for MeV electron‐flux enhancement events are not exactly the same. The rising phases for the two great events in April–May correspond to recovery phases of storms and are closely associated with a solar‐wind dynamic pressure pulse, a high‐speed stream pulse, and the negative Bz component of the interplanetary magnetic field (IMF).
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