Effects of interplanetary shock waves on energetic charged particles

Details Effects of interplanetary shock waves on energetic charged particles Effects of interplanetary shock waves on energetic charged particles

Oct 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974jgr....79.4157s&link_type=abstract

Journal of Geophysical Research, vol. 79, Oct. 1, 1974, p. 4157-4173.

Physics

43

Interplanetary Magnetic Fields, Particle Acceleration, Proton Energy, Shock Waves, Magnetohydrodynamic Waves, Oblique Shock Waves, Plasma-Particle Interactions, Solar Wind

Scientific paper

Experimental data on the influence of interplanetary perpendicular and oblique shock waves on the ambient energetic protons are presented along with a theoretical analysis of the acceleration of particles in almost perpendicular shock waves. It was found that low-energy protons can be accelerated in perpendicular shock waves by repeated crossings of the shock front up to a maximum energy given by the product of their initial energy times the ratio of the magnetic fields. High-energy protons need to stay at the shock front for longer times than low-energy protons in order to reach the same relative energy gain. In the theoretical study of proton acceleration at almost perpendicular shock waves, it was found that protons reflected at shock waves with the angle between the upstream magnetic field and the shock normal greater than about 80 deg achieve large energy gains at the shock front. The larger this angle, the higher the energy gain. However, the reflection and energization of protons at these shock waves is not 'instantaneous', neither is it a one-step process: it is performed through repeated crossings of the shock front.

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