Characteristics of optical emissions and particle precipitation in polar cap arcs

Details Characteristics of optical emissions and particle precipitation in polar cap arcs Characteristics of optical emissions and particle precipitation in polar cap arcs

Feb 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983p%26ss...31..161m&link_type=abstract

Planetary and Space Science, vol. 31, Feb. 1983, p. 161-172. Research supported by the Natural Sciences and Engineering Researc

Physics

20

Auroral Arcs, Electron Precipitation, Optical Emission Spectroscopy, Polar Caps, Coordinate Transformations, Data Acquisition, Electron Energy, Geomagnetic Latitude, Isis-B, Photometers, Spectrometers

Scientific paper

Auroral emission features at high geomagnetic latitudes are identified and characterized using simultaneous optical and particle data from the ISIS-2 satellite. Polar cap arcs are identified from two-dimensional geomagnetic transforms of the optical data along with precipitating electron data for the time at which the satellite is on the field line intersecting the arc. No precipitating protons were detected for any of the arc crossings. The precipitations particle characteristics include: (1) an electron energy spectrum with a peak in the range 350-750 eV superposed on a soft spectrum like that observed in polar rain; (2) a normally isotropic pitch angle dependence, with the exception that field-aligned fluxes are observed in association with an inverted 'v' event; and (3) an energy flux range of approximately 0.8-3 erg/(sq cm s). A possible explanation of the observed precipitating particle characteristics is that parallel electric fields are accelerating polar rain type spectra at an altitude of several thousand km.

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