Computer Science – Sound
Scientific paper
Aug 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....9512287g&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 95, Aug. 1, 1990, p. 12287-12294. Research supported by SERC.
Computer Science
Sound
10
Auroral Zones, Beam Interactions, Electron Flux Density, High Energy Electrons, Magnetohydrodynamic Waves, Plasma-Particle Interactions, Auroral Arcs, Cold Plasmas, Magnetohydrodynamic Stability, Rocket Sounding
Scientific paper
Plasma wave instabilities may occur above discrete auroral arcs where the natural accelerated auroral electron component meets the cold ionospheric plasma. These wave-particle interactions were studied on the CAESAR II rocket by measuring the modulations in energetic electron flux in the frequency ranges 0-10 kHz and 0-10 MHz. Near apogee (700 km), a strong modulation of 7.5-keV electrons at 1.4 MHz was observed where df(v)/dv was positive, just below the auroral beam velocity. The measurement is shown to be consistent with instabilities driven by both Landau and cyclotron resonant interactions with upper-hybrid waves, and also with the observation of modulations at 2.65 MHz on a low-altitude rocket flight (apogee 230 km).
Christiansen Peter J.
Gough Michael Paul
Wilhelm Klaus
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