Physics
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsh33b..02v&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SH33B-02
Physics
7513 Coronal Mass Ejections (2101), 7514 Energetic Particles (2114), 7807 Charged Particle Motion And Acceleration, 7851 Shock Waves (4455)
Scientific paper
A requirement for efficient shock acceleration is the accelerating particles must be able to encounter the shock front many times. Much attention has been paid to the effect of turbulent plasma conditions ahead of the shock in quasi-perpendicular geometries. For instance, particles propagating along magnetic field lines which meander across the shock front can cross the shock multiple times. The meandering can be produced by large amplitude, long wavelength Alfven waves propagating in the background plasma. However, inhomogeneities at large spatial scales in the ambient magnetic field can also make the incident particles encounter the shock multiple times and thus lead to efficient acceleration. This requires that the ambient field has sufficiently large intensity gradients, curved field lines or both. The acceleration mechanisms operating in these inhomogeneities lead to different properties of the observable high energy particles, e.g., that the resulting energy spectra are not necessarily power laws.
Sandroos Arto
Vainio Rami
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