STEREO/IMPACT Observations of Foreshock Electrons from 10 eV-100 keV

Details STEREO/IMPACT Observations of Foreshock Electrons from 10 eV-100 keV STEREO/IMPACT Observations of Foreshock Electrons from 10 eV-100 keV

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm51b1817p&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM51B-1817

Physics

Plasma Physics

[2154] Interplanetary Physics / Planetary Bow Shocks, [7807] Space Plasma Physics / Charged Particle Motion And Acceleration, [7845] Space Plasma Physics / Particle Acceleration, [7851] Space Plasma Physics / Shock Waves

Scientific paper

Solar wind electrons are accelerated and reflected back upstream by the terrestrial bow shock into a region known as the electron foreshock. Observed spectra at low energies are consistent with a fast Fermi process, which is dependent on the conservation of the adiabatic moment of the accelerated electrons. In the early part of its mission, the STEREO spacecraft observed many examples of electron beams in the terrestrial foreshock. The combined capabilities of the SWEA and STE instruments on STEREO can measure the electron foreshock spectrum from 10 eV to 100 keV. The highest observed accelerated electron energies can reach up to several tens of keV. These energies are of particular interest because electrons at keV energies and higher have Larmor radii of tens of km or greater, comparable to the scale sizes of the shock. Therefore, the adiabatic condition no longer applies. We compare the observed STEREO foreshock electron energy spectra with predictions based on a Liouville mapping of the observed upstream spectra through a shock interaction, and discuss implications for the fast Fermi theory.

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