Simultaneous observations of particle precipitations and auroral emissions by the Isis 2 satellite in the 19-24 MLT sector

Details Simultaneous observations of particle precipitations and auroral emissions by the Isis 2 satellite in the 19-24 MLT sector Simultaneous observations of particle precipitations and auroral emissions by the Isis 2 satellite in the 19-24 MLT sector

Jun 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82.2210l&link_type=abstract

Journal of Geophysical Research, vol. 82, June 1, 1977, p. 2210-2226.

Physics

16

Auroras, Electron Precipitation, Isis Satellites, Light Emission, Proton Precipitation, Satellite Observation, Electron Energy, Energy Spectra, Geomagnetism

Scientific paper

The paper reports simultaneous observations of auroral emissions and particle precipitation in the 19-24 MLT (magnetic local time) sector by instruments on the Isis 2 satellite. The optical intensity of the diffuse aurora is found to be produced mainly by a relatively uniform precipitation of low-energy electrons between about 100 eV and 10 keV with monotonic energy spectra. Discrete auroras are embedded within diffuse aurora and are caused by highly structured and intense electron precipitation. The corresponding electron energy spectrum consists of a monotonic component similar to that in the diffuse aurora and a peaked component often narrower than a Maxwellian spectrum. The diffuse auroras are suggested to be the optical image of the earthward termination of the plasma sheet at the auroral altitudes, which perhaps implies that the source particles of discrete auroras lie along the geomagnetic field lines within but usually near the poleward boundary of the plasma sheet.

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