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Long-duration high-energy proton events observed by GOES in October 1989

  • Authors: Anttila, A.; Kocharov, L. G.; Torsti, J.; Vainio, R.
  • Publication: Annales Geophysicae, vol. 16, Issue 8, pp.921-930, 1998
  • Solar events of 1989 October
  • Statistical study
  • ADS link
  • Abstract: We consider the prolonged injection of the high-energy (>10 MeV) protons during the three successive events observed by GOES in October 1989. We apply a solar-rotation-stereoscopy approach to study the injection of the accelerated particles from the CME-driven interplanetary shock waves in order to find out how the effectiveness of the particle acceleration and/or escape depends on the angular distance from the shock axis. We use an empirical model for the proton injection at the shock and a standard model of the interplanetary transport. The model can reproduce rather well the observed intensity-time profiles of the October 1989 events. The deduced proton injection rate is highest at the nose of the shock; the injection spectrum is always harder near the Sun. The results seem to be consistent with the scheme that the CME-driven interplanetary shock waves accelerate a seed particle population of coronal origin.
  • List of events:

Created by mevali. Last Modification: Wednesday 23 of May, 2007 09:31:08 UTC by mevali.