Characteristics of solar flare particle increases during recovery of Forbush decreases with reference to 7 May 1978 event

Physics – Space Physics

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Forbush Decreases, Particle Flux Density, Relativistic Particles, Solar Cosmic Rays, Solar Flares, Anisotropy, Interplanetary Magnetic Fields, Wavelengths

Scientific paper

Various characteristics of the ground level enhancement (GLE) observed on May 7, 1978, are derived and then compared with 30 other solar particle events observed in the last four decades, taking into account their magnitude, source position and the cosmic ray conditions at the time of the GLE. It is found that this GLE is by far the largest since 1960 and is highly anisotropic during both rise and decay. Despite the favorable conditions the maximum intensity is observed from a wide angle opening toward the sun, instead of a narrow angle in the garden-hose direction. From a preliminary comparison of earlier events it is concluded that the near earth region is not dominant in producing cosmic ray modulation.

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