A Large Proton Event Associated with Solar Filament Activity
Abstract
We report observations made from several interplanetary spacecraft, of the large low-energy particle event of 23-27 April, 1979 associated with solar filament activity. We discuss the intensity, spectral and directional evolution of the event as observed in the energy range 35-1600 keV on ISEE-3, located ∼ 0.99 AU from the Sun upstream of the Earth. We demonstrate 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, we identify the solar filament erupting on late 22 April near central meridian as the trigger for the propagating shock disturbance.
- Publication:
-
Solar Physics
- Pub Date:
- April 1983
- DOI:
- 10.1007/BF00157465
- Bibcode:
- 1983SoPh...84..321S
- Keywords:
-
- Proton Flux Density;
- Solar Activity;
- Solar Protons;
- International Sun Earth Explorer 3;
- Interplanetary Medium;
- Particle Acceleration;
- Particle Intensity;
- Shock Wave Propagation;
- Solar Physics;
- Energy Range;
- Directional Evolution;
- Heliocentric Distance;
- Interplanetary Medium;
- Proton Event