Abstract
AbstractDuring the period March - May 1981, nine interplanetary shocks passing through the position of the Prognoz-8 s/c influenced the flux of energetic protons (Ep≥ 12 keV). The temporal profiles of two of them agree with the model of diffusional acceleration. They have the greatest shock strength (among the nine observed), which corresponds to a maximum energy gain in the individual interactions of the protons with the shock front. Both are most probably associated with quasiparallel shocks initiated by the flares with the eastern heliolongitudes(> 30° E).Two events with the profile expected for the drift acceleration are caused by the flares at the western longitudes(> 30° W).The peak flux for the flares with the high importance (3B) is higher than that for low importance flares (IN) if all “intermediate” flares (position 30° E - 30° W) are combined. For those events the flux profile is more complicated and signatures of both acceleration mechanisms are apparent.
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