The role of interplanetary shocks in the longitude distribution of solar energetic particles

Astronomy and Astrophysics – Astronomy

Scientific paper

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Energetic Particles, Interplanetary Medium, Shock Wave Propagation, Solar Protons, Astronomical Models, Imp, International Sun Earth Explorer 3, Longitude, Spaceborne Experiments

Scientific paper

A study of solar proton events with well-identified sources has been carried out using data from Goddard particle experiments on IMPs 4, 5, 7, and 8 and ISEE 3. The experiments cover the energy range from about 1 to 300 MeV. It is shown that intensity-time profiles of solar proton events display an organization with respect to heliolongitude. Whilst it has been known for many years that the profile of a proton event depends on the longitude of the solar event relative to the observer, the authors suggest that the major controlling agent is the existence of an interplanetary (IP) shock. Furthermore, they explain the change in shape as a function of heliolongitude within the framework of a recently derived model for the large-scale structure of IP shocks.

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