The September 1979 solar cosmic ray event

Details The September 1979 solar cosmic ray event The September 1979 solar cosmic ray event

Aug 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983icrc...10..314h&link_type=abstract

IN: International Cosmic Ray Conference, 18th, Bangalore, India, August 22-September 3, 1983, Late Papers. Volume 10 (A85-22801

Physics

Energetic Particles, Interplanetary Space, Particle Acceleration, Solar Activity Effects, Solar Cosmic Rays, Solar Flares, Energy Spectra, International Sun Earth Explorers, Proton Flux Density, Shock Wave Propagation, Voyager 2 Spacecraft

Scientific paper

Observations of a long-lived solar particle event in September 1979, are presented. The energy flux observations were carried out simultaneously by the Voyager 2, ISEE-3, and IMP-8 satellites at widely separated radial positions. It is shown that the flux spectra of the particle population which arrived early at Voyager 2 extended to several MeV for each nucleon, although at energies above 1.5 MeV/nuc, the peak flux occurred one day later. The solar wind speed at Voyager 2 increased from about 600 km/s to 1000 km/s upon the arrival of the particles, causing rapid changes in the Voyager 2 connection longitude. It is suggested that the steepening observed in the maximum flux energy spectra above about 10 MeV/nuc at Voyager 2 may have been due to the injection of particles one day earlier.

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