X-ray spectral images of energetic electrons precipitating in the auroral zone

Details X-ray spectral images of energetic electrons precipitating in the auroral zone X-ray spectral images of energetic electrons precipitating in the auroral zone

Aug 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.8662d&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, Aug. 1, 1988, p. 8662-8680. Research supported by the Lockheed Indepe

Physics

16

Auroral Spectroscopy, Electron Precipitation, X Ray Spectra, High Resolution, Images, Spectral Resolution

Scientific paper

X-rays from the earth's auroral zone are produced by the precipitation of electrons with keV energies. An imaging X-ray spectrometer was used to observe this radiation over a 500 km field of view divided into 16 pixels. The flux and spectral slope of the precipitating electrons were calculated using high spectral resolution 4- to 40-keV X-ray data. A systematic survey of the electron spectra characteristics in a large number of individual X-ray features was conducted for the first time. Most of the precipitation was confined to well-defined locations, arcs, or isolated patches, separated by regions where no X-ray flux was detected. Narrow features were typical for energetic electrons above 56 keVm, in contrast to lower-energy electrons, which may produce relatively diffuse optical images. These X-ray images have produced two-dimensional maps of precipitation which show no trends of spectral hardness with position, while on the same spatial scales there are order of magnitude changes in the flux of precipitating electrons.

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