A large proton event associated with solar filament activity

✍ Scribed by B. Sanahuja; V. Domingo; K. P. Wenzel; J. A. Joselyn; E. Keppler

• Publisher: Springer
• Year: 1983
• Tongue: English
• Weight: 969 KB
• Volume: 84
• Category: Article
• ISSN: 0038-0938
• DOI: 10.1007/bf00157465

✦ Synopsis

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.

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.