Angular Distributions of Fe/O from Wind: New Insight into Solar Energetic Particle Transport

Details Angular Distributions of Fe/O from Wind: New Insight into Solar Energetic Particle Transport Angular Distributions of Fe/O from Wind: New Insight into Solar Energetic Particle Transport

Sep 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apj...577l..59r&link_type=abstract

The Astrophysical Journal, Volume 577, Issue 1, pp. L59-L62.

Astronomy and Astrophysics

Astronomy

9

Acceleration Of Particles, Shock Waves, Sun: Abundances, Sun: Coronal Mass Ejections (Cmes), Sun: Particle Emission

Scientific paper

We examine the angular distributions of He, O, and Fe in large solar energetic particle (SEP) events measured on the Wind spacecraft. We report, for the first time, that in a fixed velocity interval, Fe/O is often larger for particles flowing sunward along the magnetic field than for particles flowing outward from the Sun in many SEP events. This occurs because the anisotropy for O exceeds that for Fe, even though both species are streaming outward. There are no examples of events for which the outward Fe/O dominates. The behavior of Fe and O conflicts with the expectations of simple diffusion theory, that angular distributions should be independent of species. It also seems to conflict with the idea that energetic Fe scatters less than O of the same velocity. However, preliminary modeling suggests that the presence of a reflecting magnetic boundary beyond 1 AU, together with the increased scattering of O over Fe due to proton-generated Alfvén waves, can explain the direction and magnitude of the effect. These observations add a new dimension to the study of SEP transport.

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