Energetic solar particle events in a stream-structured solar wind |
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Authors: | M Scholer G Morfill A K Richter |
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Institution: | (1) Max-Planck-Institut für Physik und Astrophysik, Institut für extraterr. Physik, 8046 Garching, F.R.G.;(2) Max-Planck-Institut für Kernphysik, 69 Heidelberg, F.R.G.;(3) Max-Planck-Institut für Aeronomie, 3411 Lindau, F.R.G. |
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Abstract: | Theoretical considerations lead to a solar cosmic ray diffusion coefficient which varies with heliolongitude in a stream-structured solar wind. By solving numerically the time dependent convection-diffusion equation for the particle transport we investigate the effect of the azimuthal variation of the diffusion coefficient on intensity-time profiles as seen by a stationary observer. Depending on the position of the observer relative to the solar wind stream at the time of flare occurrence, completely different intensity-time profiles will be observed. When the spacecraft is at the time of the flare occurrence right at the leading edge of a solar wind stream, the large mean free path leads to rapid steepening of the initial phase of the intensity profile. The longitudinally decreasing mean free path 1 day in front of the leading edge will lead to intensity-time profiles similar to long-time injection events if the event occurs before the stationary observer enters the flux tubes with the decreasing diffusion coefficient. |
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