Physics
Scientific paper
Apr 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983soph...84..321s&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 84, April 1983, p. 321-337.
Physics
44
Proton Flux Density, Solar Activity, Solar Protons, International Sun Earth Explorer 3, Interplanetary Medium, Particle Acceleration, Particle Intensity, Shock Wave Propagation
Scientific paper
Observations, made from several interplanetary spacecraft, of the large low-energy particle event of 23-27 April, 1979 associated with solar filament activity are reported. The intensity, spectral and directional evolution of the event as observed in the energy range 35-1600 keV on ISEE-3, located about 0.99 AU from the sun upstream of the earth are discussed. It is demonstrated that the shock disturbance propagating through the interplanetary medium and observed at ISEE-3 on 24/25 April strongly controls the particle event. From a comparison of the ISEE-3 observations with those on other spacecraft, in particular, on Helios-2, located at 0.41 AU heliocentric distance near the sun-earth line, the solar filament erupting on late 22 April near central meridian is identified as the trigger for the propagating shock disturbance. This disturbance, which comprises a forward shock and a reverse shock at the orbit of ISEE-3, is found to be the main source of the energetic proton population observed.
Domingo Vicente
Joselyn Jo Ann
Keppler Erhard
Sanahuja Blai
Wenzel Klaus-Peter
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