Fermi and Betatron Acceleration of Suprathermal Electrons behind Dipolarization Fronts

Details Fermi and Betatron Acceleration of Suprathermal Electrons behind Dipolarization Fronts Fermi and Betatron Acceleration of Suprathermal Electrons behind Dipolarization Fronts

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm11d..07f&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM11D-07

Physics

[2723] Magnetospheric Physics / Magnetic Reconnection, [2744] Magnetospheric Physics / Magnetotail, [2764] Magnetospheric Physics / Plasma Sheet, [2790] Magnetospheric Physics / Substorms

Scientific paper

Two dipolarization front (DF) structures observed by Cluster in the Earth midtail region (XGSM ≈-15 RE), showing respectively the feature of Fermi and betatron acceleration of suprathermal electrons, are studied in detail in this paper. Our results show that Fermi acceleration dominates inside a decaying flux pileup region (FPR), while betatron acceleration dominates inside a growing FPR. Both decaying and growing FPRs are associated with the DF and can be distinguished by examining whether the peak of the bursty bulk flow (BBF) is co-located with the DF (decaying) or is behind the DF (growing). Fermi acceleration is routinely caused by the shrinking length of flux tubes, while betatron acceleration is caused by a local compression of the magnetic field. With a simple model, we reproduce the processes of Fermi and betatron acceleration for the higher-energy (>40 keV) electrons. For the lower-energy (<20 keV) electrons, Fermi and betatron acceleration are not the dominant processes. Our observations reveal that betatron acceleration can be prominent in the midtail region even though the magnetic field lines are significantly stretched there.

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