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A double-peaked solar flare: Conclusions on particle transport

  • Authors: Torsti, Jarmo; Schultz, C. G.
  • Publication: Proceedings of the First SOHO Workshop: Coronal Streamers, Coronal Loops, and Coronal and Solar Wind Composition p 343-346, 1992
  • Solar event of 1989 September 29
  • Case study
  • ADS link
  • Abstract: The large solar event of 29 Sep. 1989 at 11:33 UT was analyzed. Data was available from the GOES 6 and 7 satellites and from some 26 neutron monitors worldwide. Of the latter, the ground level enhancement measured by 7 stations was given an in depth analysis. Conclusions on the energy spectra and acceleration time are given, based on a double diffusive transport model containing a one dimensional interplanetary transport along the field line, and a two dimensional transport, tentatively called coronal. A special feature of this event is a clear double peak structure, with the ratio of the second peak amplitude to the first dropping from as much as 2 down to 1 when the rigidity increases from 100 to 500 MV, and being a few tens of percent in the GV rigidity region. Comparing different energies, the identical starting time of the fluxes forces the conclusion that the acceleration of the 100 MV particles has started several tens of minutes before the production of the first relativistic particles.

Created by mevali. Last Modification: Wednesday 23 of May, 2007 09:56:02 UTC by mevali.