Abstract Suprathermal electrons precipitated in response to SEPAC electron accelerator activity on board Spacelab 1 have been observed by a channeltron electron spectrometer covering the energy range from 0.1 to 12.5 keV. Three series of beams of 1 to 5 seconds duration with current strengths up to 300 mA and energies up to 5 keV induced electron fluxes up to 1011 electrons eV−1cm−2s−1sr−1. The FO-2 series showed a very high electron enhancement below and at the beam energy and a distinct fall off above it, while the FO-7-1 and FO-7-2 series showed a somewhat lower electron enhancement without indication of the beam energy in the flux density curves. A characteristic feature of all SEPAC series was an enhanced electron flux above the beam energy of more than 100 times the background level. The return flux distribution did not respect the forbidden single particle trajectory regime resulting from spacecraft obstruction but seemed to depend mainly on the coelevation angle according to the beam direction and on the line of sight from the spectrometer to the accelerator.
Spacelab-1 observations of suprathermal electrons induced by artificial electron beams
Advances in Space Research ; 8 , 1 ; 111-114
1988-01-01
4 pages
Article (Journal)
Electronic Resource
English
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