A simulation study of two major events in the heliosphere during the present sunspot cycle

Physics

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Computerized Simulation, Heliosphere, Solar Activity Effects, Solar Flares, Sunspot Cycle, Cosmic Rays, H Alpha Line, Solar Wind Velocity, Temporal Distribution

Scientific paper

The two major disturbances in the heliosphere during the present sunspot cycle, the event of June - August 1982 and the event of April - June 1978, are simulated by the method developed by Hakamada and Akasofu (1982). Specifically, the authors attempt to simulate effects of six major flares from three active regions in June - July 1982 and April - May 1978, respectively. A comparison of the results with the solar wind observations at Pioneer 12 (≡0.8 AU), ISEE 3 (≡1 AU), Pioneer 11 (≡7 - 13 AU), and Pioneer 10 (≡16 - 28 AU) suggests that some major flares occurred behind the disk of the sun during the two periods. The method provides qualitatively some information as to how such a series of intense solar flares can greatly disturb both the inner and outer heliospheres. A long lasting effect on cosmic rays is discussed in conjunction with the disturbed heliosphere.

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