Computer Science – Sound
Scientific paper
Mar 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984p%26ss...32..379s&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 32, March 1984, p. 379-389.
Computer Science
Sound
30
Auroral Zones, Electron Precipitation, Electronic Spectra, Ion Acoustic Waves, Angular Distribution, Energy Distribution, Particle Acceleration
Scientific paper
Energy and pitch-angle distributions of auroral inverted-V electron spectra recorded by the low-energy-electron analyzer on the Atmospheric Explorer D satellite are analyzed, using quasi-linear, ion-acoustic-turbulence theory. The observational data are summarized, presented graphically, discussed, and interpreted in terms of a theoretical model. The population governed by the power law J = A x (E to the -gamma), with gamma near 1 observed at 25-1000 eV, is attributed to a quasi-stationary distribution of suprathermal electrons in resonant interaction with ion sound waves in a current-driven-turbulence region at an altitude of about 1 earth radius. The velocity space of the turbulent region is characterized by a runaway cone, through which particles escape to form intense field-aligned electron fluxes with collimation angles less than 10 deg. The implications of these findings are examined in the context of a complete reinterpretation of the observed electron spectra.
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