Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm11c1183s&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SM11C-1183
Physics
2407 Auroral Ionosphere (2704), 2471 Plasma Waves And Instabilities, 2483 Wave/Particle Interactions
Scientific paper
On January 28th, 2003 at 7:50 UT the High Bandwidth Auroral Rocket (HIBAR) was launhed into active aurora from Poker Flat, Alaska. The rocket had its spin axis parallel to the background magnetic field and it reached an apogee of approximately 382 km. Instruments on board included particle and electric field detectors which detected waveforms continuously with a 5 MHz bandwidth. The wave receiver detected two bursts of intense waves at 2.65 MHz, at and just below the upper hybrid frequency, at the approximate altitudes of 377 and 379 km respectively. The wave frequency is about one percent below the local 2fce. The amplitude of these upper hybrid wave bursts ranges from 10 to 140 mV/m, and the ratio of the electric field perpendicular to the background magnetic field to that parallel to the magnetic field is on average about Eperpendicular to }/E{∥ = 20. The wave bursts consist of several parallel narrowband features with apparent frequency spacings of about 10 kHz. We speculate that these upper hybrid wave bursts are the sources for electromagnetic auroral roar emissions observed at ground-level. If so, the HIBAR rocket observations provide the first opportunity to estimate the efficiency of the electrostatic to electromagnetic wave conversion, and to test theories of the origin of the fine structure of the auroral roar signals.
Bounds Scott R.
Kletzing Craig A.
LaBelle James
Samara M.
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