CME-Driven Shocks and Particle Acceleration in Solar Corona and Interplanetary Space

Details CME-Driven Shocks and Particle Acceleration in Solar Corona and Interplanetary Space CME-Driven Shocks and Particle Acceleration in Solar Corona and Interplanetary Space

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsh23a0325z&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SH23A-0325

Other

2139 Interplanetary Shocks, 7509 Corona, 7513 Coronal Mass Ejections (2101), 7514 Energetic Particles (2114), 7974 Solar Effects

Scientific paper

Solar energetic particles (SEPs) that severely affect space weather are understood to come from two different sources: (1) solar flares and (2) coronal mass ejections (CMEs)-driven shocks. The SEPs from solar flares are usually classified as the impulsive events with extreme enhancements in 3He/4He and enhanced heavy ions caused by the particle-wave resonances and the first/second-order Fermi acceleration. On the other hand, the most intense SEP (or gradual) events are believed to be produced by the acceleration of CME-driven shocks via the Fermi acceleration mechanism for quasi-parallel shocks and shock-drift acceleration for quasi-perpendicular shocks. By the motions of the CME-driven oblique shocks across the background magnetic field lines, an electric field is induced, which is effective in the acceleration of charged particles. The acceleration process strongly depends on not only the strength of the electric field induced by the across-field line motions, but also on the CME-driven shock geometric configuration, propagation, and temporal and spatial evolutions. In this presentation, we will present our recent simulation results of the CME-driven shock properties and the induced electric field in terms of an azimuthal symmetrical MHD simulation model for both slow (accelerated) and fast (constant speed) CMEs with and without loop structures. We will also analytically estimate the fluxes of energetic particles accelerated by the CME-driven shocks and compare the results with observations.

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