Rocket observations of structured upper hybrid waves at fuh = 2fce

Details Rocket observations of structured upper hybrid waves at fuh = 2fce Rocket observations of structured upper hybrid waves at fuh = 2fce

Nov 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3122804s&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 22, CiteID L22804

Physics

9

Ionosphere: Auroral Ionosphere (2704), Ionosphere: Electric Fields (2712), Ionosphere: Wave/Particle Interactions, Magnetospheric Physics: Auroral Phenomena (2407), Magnetospheric Physics: Plasma Waves And Instabilities

Scientific paper

The HIgh Bandwidth Auroral Rocket (HIBAR), launched into active pre-midnight aurora, encountered two bursts of 2-10 mV/m upper hybrid waves just below fuh = 2fce at approximately 377 and 390 km altitude. These waves occur in association with a density ``shoulder'' and enhancement, respectively. The waves show several bands of frequency structure with 4-8 kHz spacings and, within these, bands of frequency sub structure with 1-2 kHz spacings. At the time of the waves, the measured electron distribution indicates wave instability for frequencies 1-1.2% percent below the electron cyclotron harmonic. These results agree qualitatively with theoretical work predicting banded structure associated with upper hybrid waves trapped in density enhancements.

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