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Causes of the wide longitudinal signatures of Solar Energetic Particle (SEP) events

Causes of the wide longitudinal signatures of Solar Energetic Particle (SEP) events.

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Causes of the wide longitudinal signatures of Solar Energetic Particle (SEP) events

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  1. Causes of the wide longitudinal signatures of Solar Energetic Particle (SEP) events STEREO has given us a new tool to look at the longitudinal dependence of SEPs.  SEPs are seen over a wider range than expected from the size of the corresponding CMEs.  Yet the particle dropouts seen in small impulsive flares indicate that cross-field diffusion is not large.  Two possibilities are that the acceleration happens over a wider region, maybe correlated with sympathetic activity as seen on SDO, or that the accelerated particles spread out very near the surface of the Sun.

  2. Causes of the wide longitudinal signatures of Solar Energetic Particle (SEP) events Intro to Wide Events (Tycho von Rosenvinge) Observations of wide events Sympathetic Activity Longitudinal transport near Sun (Photosphere/ Low Corona) Large scale waves Flux tube expansion Field Line Wandering Propagation in heliosphere CMEs Wide acceleration region Magnetic field distortion Cross Field Diffusion Reservoir

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