Energetic solar particle events in a stream-structured solar wind

✍ Scribed by M. Scholer; G. Morfill; A. K. Richter

• Publisher: Springer
• Year: 1979
• Tongue: English
• Weight: 517 KB
• Volume: 64
• Category: Article
• ISSN: 0038-0938
• DOI: 10.1007/bf00151448

✦ Synopsis

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 convectiondiffusion 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.