Shock Surfing as the Preenergization Mechanism at the Astrophysical Shocks

Details Shock Surfing as the Preenergization Mechanism at the Astrophysical Shocks Shock Surfing as the Preenergization Mechanism at the Astrophysical Shocks

Nov 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aps..dppbmp127l&link_type=abstract

American Physical Society, Division of Plasma Physics Meeting, November 17-21, 1997, abstract #bMoaP127.

Physics

Plasma Physics

Scientific paper

A generalization of the previously proposed model of particle acceleration at quasi-perpendicular shocks by shock surfing is described in the paper. In the new version, lower hybrid wave turbulence excited at the shock front by the counterstreaming proton population, is included. Due to scattering by plasma turbulence, the particle velocity distribution is isotropized in the direction of wave propagation, orthogonal to both shock normal and magnetic field. This results in the disappearance of the turning point upstream of the shock front, the surfing particle is detrapped at the shock and acceleration stops. In the time scale of the bounce period of the surfing particle, the velocity scattering develops much faster for lighter particle producing preferential acceleration of the heavier particles at the solar wind termination shock, in agreement with observations of the composition of the anomalous cosmic ray component.

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