Physics – Plasma Physics
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agusmsh53a..08y&link_type=abstract
American Geophysical Union, Spring Meeting 2007, abstract #SH53A-08
Physics
Plasma Physics
7800 Space Plasma Physics, 7807 Charged Particle Motion And Acceleration
Scientific paper
Collisonless shocks redistribute energy, heating and accelerating electrons responsible for various plasma waves and emissions in the upstream and downstream shock region. In this paper we study numerically the electron dynamics in time-dependent shock fields generated by an one-dimensional multiscale hybrid code, and steady state model shocks by tracing the exact test particle electron trajectories. It is shown that the upstream energetic electron bursts are produced cyclically at the shock reformation period in the time-dependent reforming shocks. Observation of the upstream electron distribution functions shows time-varying loss cone structures and beam features. In contrast to the reforming shocks, a continous electron beam is formed by the reflected electrons in upstream of steady state model shocks. This calculation demonstrates that shock nonstationarity will lead to major changes in electron distributions and associated plasma waves upstream and downstream, probably requiring modification to the steady state shock model used for predicting foreshock radio emission.
Cairns Iver H.
Robinson Adam P.
Yuan Xianbao
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