Rocket observation of electron fluxes over a pulsating aurora

Details Rocket observation of electron fluxes over a pulsating aurora Rocket observation of electron fluxes over a pulsating aurora

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992p%26ss...40.1043s&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 40, no. 8, Aug. 1992, p. 1043-1047, 1049-1054.

Computer Science

Sound

2

Auroras, Earth Ionosphere, Electron Precipitation, Electrons, Flux (Rate), Rocket Sounding, Electron Acceleration, Electron Energy, Energy Spectra

Scientific paper

Electron spectra over the energy range between 23 eV and 16 keV were measured with a quadrispherical electrostatic analyzer on board the S-520-12 rocket launched from Andoya, Norway, on February 26, 1990, into pulsating aurora. The rocket flew from one pulsating patch to another, and the spectral variation of the precipitating electron flux following this transition was observed. A long-time (greater than 20 s) variation of the electron energy spectra which reflects the spatial distribution of the pulsating patches was observed. Energy spectra of the precipitating electrons initially had power-law distributions, the flux intensity of which decreased as the rocket flew toward the boundary of the pulsating patch. A short-time (less than 20 s) variation of the electron energy spectra, namely, particle pulsation, whose period agreed with that derived from the variation in the optical emission, was observed. It is suggested that the well-defined precipitation events of the lower energy electrons was caused by acceleration due to the upward propagating kinetic Alfven wave which was produced by the auroral precipitating electrons and resultant ionization of the neutral atmosphere.

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