Fast Fermi and gradient drift acceleration of electrons at nearly perpendicular collisionless shocks

Details Fast Fermi and gradient drift acceleration of electrons at nearly perpendicular collisionless shocks Fast Fermi and gradient drift acceleration of electrons at nearly perpendicular collisionless shocks

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....9415367k&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Nov. 1, 1989, p. 15367-15372.

Physics

37

Bow Waves, Electron Acceleration, Electron Energy, Magnetic Moments, Plasmasphere, Shock Wave Interaction, Electromagnetic Radiation, Electrostatic Waves, Particle Interactions

Scientific paper

Electrons can be reflected and effectively energized at quasi-perpendicular shocks. At a curved shock this process is most prominent where the upstream magnetic field and the shock surface are tangent. A theoretical explanation of the underlying physical mechanism in terms of fast Fermi acceleration has been proposed in the literature. The theory uses properties of the de Hoffmann-Teller frame and assumes conservation of magnetic moment in a static, simplified shock profile. Here, the discussion is extended in order to clarify certain aspects of the reflection process and to pinpoint the physical mechanisms that are operative and dominant from the viewpoint of the normal incidence frame. By reducing the analysis to the essential physical content and solving the pertinent energy equation, the equivalence of fast Fermi and gradient drift acceleration is shown.

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