Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh31b1998z&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SH31B-1998
Astronomy and Astrophysics
Astrophysics
[7514] Solar Physics, Astrophysics, And Astronomy / Energetic Particles
Scientific paper
It has been recently suggested that a "twin-CME" scenario may be the cause of GLE events.[1] In some extreme events, such as the 2005.01.17 event, two fast shocks occur within 30 minutes and the second one catches the first. Here we examine particle acceleration at a converging shock pair using test particle simulation. Particle trajectories are followed with constant shock compression ratio and static upstream and downstream magnetic field. Both parallel and perpendicular diffusions are considered. With perp diffusion treated as gyro-centers jumping across field lines and parallel diffusion treated as gyro-centers "random walking" along the filed lines. Particle spectra upstream the first shock, downstream the first shock and downstream the second shock are obtained. The implication of a two-shock pair in enhancing the diffusive shock acceleration process will be discussed. [1] A twin-CME scenario for Ground Level Events, G. Li, R. Moore, R. A. Mewaldt, L. Zhao and A. Labrador, Space Science Review, to appear.
Li Gaojun
Zhao Lifeng
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