Field-aligned electron precipitation at the edge of an arc

Details Field-aligned electron precipitation at the edge of an arc Field-aligned electron precipitation at the edge of an arc

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.1723m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, Feb. 1, 1986, p. 1723-1730.

Computer Science

Sound

68

Auroral Arcs, Electron Acceleration, Electron Precipitation, Rocket Sounding, Space Plasmas, Cold Plasmas, Electron Distribution, Electrostatic Waves, Energy Spectra, Plasma Density, Potential Fields

Scientific paper

Measurements of field-aligned electrons at the edge of an arc are presented from a sounding rocket flight through a quiet afternoon auroral arc. High time resolution measurements show the evolution of the electron distribution function over the 2.3-km width of field-aligned precipitation. A nearly constant 1.2-eV perpendicular temperature was found for these field-aligned fluxes over a broad range of parallel energies (100 - 900 eV). The small perpendicular temperature indicates that the acceleration region is located at a low altitude. Two models of cold plasma convection into the edge of a V-shaped potential structure are examined and found to be consistent with both the observed fluxes and spatial width of the edge precipitation. Both models predict an average source plasma density less than 130/cu cm to account for the observed field-aligned fluxes and thus an acceleration region well above 1000 km.

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