Auroral rays - Filamentation in the auroral accelerator

Details Auroral rays - Filamentation in the auroral accelerator Auroral rays - Filamentation in the auroral accelerator

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jatp...50..537h&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 50, June 1988, p. 537-539, 541-544.

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Auroral Arcs, Electric Fields, Electron Acceleration, Geomagnetism, Rocket Sounding, Electron Energy, Fine Structure, Visual Observation

Scientific paper

In situ measurements of particles, fields and optical emissions from a rocket that encountered auroral rays are reported. The measurements give insight into the production of rays, as well as the production of large fluctuations in electric fields perpendicular to the magnetic field. The fine structure and rapid variations of the electron energy flux associated with the rays are apparently produced by modulation in the degree of electron acceleration. Rays are produced when the energy flux increases in localized regions to values even higher than those normally encountered in bright auroral forms. Close and consistent similarities in the variations of the electron energy flux, the light and the electric fields suggest that the field variations were produced as a direct result of the changes in the stream of accelerated electrons. In examining possible causes of the velocity changes that produce the rays, two acceleration processes are considered; acceleration as a consequence of a potential difference between the magnetosphere and the atmosphere and acceleration by waves.

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