Field-aligned electrons at the lobe/plasma sheet boundary in the mid-to-distant magnetotail and their association with reconnection

Details Field-aligned electrons at the lobe/plasma sheet boundary in the mid-to-distant magnetotail and their association with reconnection Field-aligned electrons at the lobe/plasma sheet boundary in the mid-to-distant magnetotail and their association with reconnection

Mar 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3305101m&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 5, CiteID L05101

Physics

Plasma Physics

9

Magnetospheric Physics: Magnetotail, Magnetospheric Physics: Magnetotail Boundary Layers, Space Plasma Physics: Magnetic Reconnection (2723, 7526)

Scientific paper

We have surveyed field-aligned electrons at the lobe/plasma sheet boundary and their association with reconnection in the distant magnetotail where reconnection is quasi-steady and large scale. Asymmetric (in energy) counterstreaming electrons are detected in ~30% of the boundary crossings when high-speed flows are present in the plasma sheet. In 98% of the electron beam cases the low-energy electrons are directed toward and the higher-energy electrons directed away from the X-line. The well-organized (by the signs of Bx and Vx) quadrupolar pattern of the electrons indicates that these electrons are associated with reconnection. The low-energy electrons could be the outer part of the Hall current loop, similar to previous reports in the near-Earth region. The mean electron energy in the distant tail is a factor of ten lower than in the near-Earth tail. Our observations suggest that the Hall effect can be detected even at large distances from the diffusion region.

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