Particle acceleration at oblique shock fronts

Details Particle acceleration at oblique shock fronts Particle acceleration at oblique shock fronts

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.239..995k&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 239, Aug. 15, 1989, p. 995-1011.

Astronomy and Astrophysics

Astronomy

81

Oblique Shock Waves, Particle Acceleration, Relativistic Plasmas, Shock Fronts, Fermi Surfaces, Lorentz Transformations, Magnetic Moments, Plasma Spectra

Scientific paper

The spectral index of particles accelerated at oblique shocks by a combination of the first-order Fermi mechanism and the shock drift mechanism are calculated. By assuming that particles conserve their magnetic moment on crossing the shock, and are scattered in pich angle by turbulence both upstream and downstream of the shock, it is shown that oblique shocks lead to flatter spectra than parallel shocks. Synchrotron spectral indices as low as alpha = 0 are predicted for highly oblique shocks. Only for extremely nonrelativistic shocks is the spectral index independent of the angle between the magnetic field and the shock normal.

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