Particle acceleration at corotating interaction regions in the three-dimensional heliosphere

Details Particle acceleration at corotating interaction regions in the three-dimensional heliosphere Particle acceleration at corotating interaction regions in the three-dimensional heliosphere

Feb 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jgr...103.2003d&link_type=abstract

Journal of Geophysical Research, vol. 103, p. 2003

Physics

19

Heliosphere, Particle Acceleration, Plasma Interactions, Rotating Plasmas, Ulysses Mission, Proton Density (Concentration), Energetic Particles, Magnetic Compression, Magnetohydrodynamic Waves

Scientific paper

We investigate the relationship between the energetic (about 1 MeV) proton intensity (J) and the magnetic compression ratio (c) measured at the trailing edges of corotating interaction regions observed at Ulysses. In general, our results show that the proton intensity was well correlated with the compression ratio, provided that the seed intensity remained constant, consistent with predictions of the Fermi model. Specifically, our results indicate that particles were accelerated to above about 1 MeV in energy at or near the trailing edges of the compression regions observed in the midlatitude southern heliosphere, irrespective of whether the bounding reverse shocks were present or not. We conclude that shock acceleration is probably not the only mechanism by which particles are accelerated to above about 1 MeV in energy at compression or interaction regions (CIRs). On the basis of magnetic field measurements obtained near the trailing edges of several midlatitude CIRs, we propose that particles could have been accelerated via the Fermi mechanism by being scattered back and forth across the trailing edges of the compression regions by large-amplitude Alfven waves.

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