Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1039..137s&link_type=abstract
PARTICLE ACCELERATION AND TRANSPORT IN THE HELIOSPHERE AND BEYOND: 7th Annual International Astrophysics Conference. AIP Confer
Astronomy and Astrophysics
Astrophysics
Astronomical Observations, Particle Acceleration, Magnetohydrodynamics And Plasmas, Flares, Interplanetary Magnetic Fields, Abundances, Chemical Composition
Scientific paper
Particle acceleration at co-rotating forward shocks is investigated using Ulysses magnetic field and energetic ion measurements obtained near 5 AU in 2003-2004. The specific objective is the relation between the energetic accelerated particles and upstream magnetic field fluctuations predicted by shock drift acceleration theory that requires the particles to repeatedly scatter from fluctuations upstream and downstream of the shock. Six sample shocks and accelerated particles are analyzed using the intensities of ~100 keV ions and magnetic field fluctuations upstream and the shock properties. The principal result is a correlation between the ion intensities and the mean square field variations as predicted. However, the field variations exhibit f-5/3 frequency spectra characteristic of the solar wind. Upstream waves generated by the particles predicted to be present nearer the shock are not unambiguously identified but are not ruled out by this preliminary analysis.
Smith Edward. J.
Zhou Xiaoyan
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