Optical-particle characteristics of pulsating aurora

Details Optical-particle characteristics of pulsating aurora Optical-particle characteristics of pulsating aurora

Jul 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jatp...40..871m&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 40, July 1978, p. 871-876.

Physics

Auroras, Electromagnetic Pulses, Electron Energy, Light Emission, Electron Precipitation, Maxwell-Boltzmann Density Function, Optical Measurement, Rocket-Borne Instruments

Scientific paper

The characteristic energy of electrons producing pulsating aurora has been investigated by measuring the I(557.7)/I(427.8) column emission ratio in auroral forms in the magnetic zenith. A decrease in the ratio is regularly seen at pulsation maxima but the change in deduced electron characteristic energy is not large. In one form the change was from 2.2 to 2.6 keV, while in another more active pulsating form the change was from 2.6 to 4.0 keV. These are in good agreement with recent rocket measurements of electron spectra in pulsating aurora which show the spectral distributions to be Maxwellian with characteristic energies of only a few keV. This ratio technique appears to be of value in studying the morphology of pulsating aurora and the mechanism producing it.

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