A study of the interplanetary disturbances on 1–4 April 1979

Abstract

Three interplanetary shock events during the first week of April 1979 are modeled by the method developed originally by Hakamada and Akasofu (1982, Space. Sci. Rev. 31, 3). There occurred a large number of weak and medium intensity solar flares during this period. However, solar wind observations at three points, the Earth ( ISEE-3), Helios A and B, enabled us to choose three solar flares and their parameters in such a way that the simulated arrival times and the speed jumps of the shock waves at the three points are in fair agreement with the observations.