On the relationship between cosmic noise absorption and auroral X-rays - A case study

Details On the relationship between cosmic noise absorption and auroral X-rays - A case study On the relationship between cosmic noise absorption and auroral X-rays - A case study

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jatp...51..213o&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 51, March 1989, p. 213-222. Research supported by the Norg

Physics

Auroral Ionization, Cosmic Noise, Electron Precipitation, X Rays, Auroral Zones, Balloon-Borne Instruments, Bremsstrahlung, Radiation Detectors, Riometers

Scientific paper

Auroral X-ray observations obtained by seven collimated X-ray detectors on a balloon and cosmic noise absorption (CNA) measurements from riometer stations within and outside the field of view of the X-ray detectors, are used for a phenomenological study of an electron precipitation event in the post midnight/early morning sector of the auroral zone. Periods of strong spatial gradients of the CNA and almost uniform X-ray intensities were found as well as periods of small CNA gradients and strongly non-uniform X-ray intensities. There is apparently little correspondence between strong spatial gradients of the CNA and the anisotropy of the X-ray intensities. A possible explanation is that the electron precipitation consists of two components: a nearly uniform background and smaller spatial structures (patches). The existence of small (10-20 km) patches is found to have a minute effect on the CNA as measured by a conventional riometer, but the patches may considerably increase the total X-ray fluxes.

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