Observations of earthward streaming electrons at the trailing boundary of a plasmoid

Details Observations of earthward streaming electrons at the trailing boundary of a plasmoid Observations of earthward streaming electrons at the trailing boundary of a plasmoid

Nov 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997georl..24.2893f&link_type=abstract

Geophysical Research Letters, vol. 24, p. 2893

Physics

39

Field Aligned Currents, Plasma Layers, Plasmas (Physics), Electron Beams, Beam Interactions, Plasma Interactions, Magnetic Effects

Scientific paper

In this paper, we report on highly asymmetric spectrum of electrons observed at the boundary of postplasmoid plasma sheet (PPPS). The data were obtained when GEOTAIL made repeated crossings of the boundary after encountering with a tailward flowing plasmoid at XGSM to approximately -46 RE. In the spectrum, electrons in 0.1-1 keV energy range are seen to flow earthward along the lobe-like field lines into the PPPS counter to more energetic components (ions and electrons) leaking from the PPPS. In the boundary region, earthward streaming electrons are observed even when the energetic leaking components almost disappear, which makes us characterize this region more generally by tailward flowing field aligned currents (FAC). By referring to hybrid code (ion particles, massless electron fluid) results, we propose that the earthward flowing electrons sustain the FAC away from the X-line (tailward if a spacecraft, is located tailward of the X-line), which is a part of a Hall current loop built-up in the course of magnetic reconnection.

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