Two-tiered auroral band

Details Two-tiered auroral band Two-tiered auroral band

Nov 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jatp...37.1501o&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 37, Nov. 1975, p. 1501-1504.

Physics

3

Auroras, Geomagnetism, Light Emission, Luminous Intensity, Atmospheric Radiation, Electron Energy, Electron Flux Density, Energy Spectra, Lines Of Force, Magnetic Effects, Spectrum Analysis, Television Cameras, Vertical Distribution

Scientific paper

Photographs taken at 223723 to 223740 UT on June 25, 1971 by a TV camera sensitive to wavelengths from 4000 to 7000 A (maximum sensitivity at 4200 A) display a double peaked distribution with respect to altitude in the luminosity of a thin sheet aurora along the magnetic field. The two-tiered appearance occurs along a single field-aligned band and is not due to the separation of two independent sheets viewed obliquely. The altitudes of the belts are estimated to be 114 km and 126-128 km. In accordance with calculations of energy deposition from auroral electrons (Berger et al., 1970), three levels correspond to primary energies of 2.7-3.0 and 5.4 keV for field-aligned fluxes, and 3.0-3.3 and 5.9 keV for lower hemispheric isotropic fluxes, respectively. It is suggested that the two-tiered structure studied may be attributed to the field-aligned flux of 2.7-3.0 keV electrons and the isotropic flux of 5.9 keV electrons.

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