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

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

Aug 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998angeo..16..921a&link_type=abstract

Annales Geophysicae, vol. 16, Issue 8, pp.921-930

Physics

6

Scientific paper

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.

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