Auroral electron distribution function

Details Auroral electron distribution function Auroral electron distribution function

Feb 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83..586k&link_type=abstract

Journal of Geophysical Research, vol. 83, Feb. 1, 1978, p. 586-598.

Physics

5

Auroras, Electron Distribution, Rocket Flight, All Sky Photography, Electron Plasma

Scientific paper

During a rocket flight over an active aurora, electron velocity distribution is studied in the 15-25 keV range. The results are then compared to optical observations made by all-sky cameras and a television system. A broad plateau produced by downcoming electrons was observed. Smaller plateaus were seen when the rocket was south of arcs evident in all-sky camera photographs. By extending to higher energies when the rocket passed out of auroral forms, the plateaus appeared to broaden. When the rocket left an arc or entered weak diffuse auroral structures, the plateaus shrank as the more energetic portions faded. When field-aligned rays were observed within the arcs, the plateau's high-velocity cutoff was found to fluctuate. The results indicate that the auroral plasma was very unstable above the rocket. It is suggested that plateaus are produced as an unstable plasma evolves toward a quasi-equilibrium state.

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