Energetic Particles Accelerated by Shocks in the Heliosphere: What is the Source Material?

Details Energetic Particles Accelerated by Shocks in the Heliosphere: What is the Source Material? Energetic Particles Accelerated by Shocks in the Heliosphere: What is the Source Material?

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aipc..781..219m&link_type=abstract

THE PHYSICS OF COLLISIONLESS SHOCKS: 4th Annual IGPP International Astrophysics Conference. AIP Conference Proceedings, Volume

Astronomy and Astrophysics

Astrophysics

2

Solar Cosmic Ray Particles, Acceleration, Shock Waves, Solar Wind, Cosmic Ray Energy Spectra, Interplanetary Matter, Particle Acceleration, Planetary Bow Shocks, Interplanetary Shocks, Particle Emission, Solar Wind

Scientific paper

Theoretical studies of particle acceleration by shocks have successfully modeled many observed features of the particle energy spectra and temporal variations; however, spectral slopes do not agree with in situ observations, and intensities show huge variations not explained by the models. Recent observations have shown that trace ions in the solar wind, such as 3He and He+, are present in the accelerated particles with enhanced abundances. The average heavy ion composition is also found to differ significantly from the solar wind. It is observed that these features correlate significantly with ambient suprathermal material abundances, giving evidence that the suprathermals are the seed population that is actually energized. This raises important new questions such as why the suprathermals are favored over the much more abundant solar wind. Since the suprathermal ion population has many more contributors, and much larger variability than the solar wind, this population needs much more detailed study to allow a closure of theory and observations in interplanetary space.

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