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Detailed Reference Information |
Skoug, R.M., Gosling, J.T., McComas, D.J., Smith, C.W. and Hu, Q. (2006). Suprathermal electron 90° pitch angle depletions at reverse shocks in the solar wind. Journal of Geophysical Research 111: doi: 10.1029/2005JA011316. issn: 0148-0227. |
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ACE/SWEPAM suprathermal electron pitch angle distributions often show depletions centered on and symmetric about 90 degree pitch angle. It has been suggested that these distributions can arise from a combination of focusing and mirroring of electrons associated with connection to magnetic field enhancements beyond the spacecraft. Assuming adiabatic particle motions, the width of the depletion in pitch angle is predicted to be a function of the strength of the magnetic field enhancement relative to the field at the measurement location. In this work, we test this model of depletion formation by examining depletions upstream from reverse shocks observed by ACE. Roughly symmetric depletions centered on 90 degree pitch angle were observed upstream from each of the 20 reverse shocks encountered by ACE from February 1998 to February 2003. In addition, the widths of the shock-associated depletions are consistent with formation by adiabatic focusing and mirroring of electrons, providing strong support for the validity of this model. |
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BACKGROUND DATA FILES |
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Abstract |
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Keywords
Interplanetary Physics, Interplanetary shocks, Interplanetary Physics, Solar wind plasma, Interplanetary Physics, Interplanetary magnetic fields, Interplanetary Physics, Discontinuities, suprathermal electrons, 90-degree pitch angle depletions, strahl and halo electrons, interplanetary reverse shocks, interplanetary magnetic field, de Hoffman-Teller frame |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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