Journal article
Observation of electromagnetic oxygen cyclotron waves in a flickering aurora
Geophysical research letters, Vol.22(18), pp.2465-2468
1995
DOI: 10.1029/95GL02409
Abstract
Instruments on the Auroral Turbulence rocket detected several intervals of weak electromagnetic oscillations at frequencies of 6–13 Hz in a strongly flickering auroral arc. These oscillations have amplitudes of up to δB ∼ 3 nT and δE ∼ 4 mV/m and have downward field-aligned Poynting fluxes of up to ∼10−5 W/m². Fluctuations in the parallel electron flux at about 9 Hz were observed in association with the strongest of these oscillations. Simultaneous ground-based optical data show that the arc was flickering at frequencies of 8–15 Hz. The observed frequencies would match the oxygen cyclotron frequency at ∼4500 km altitude. In one wave/particle event the apparent lag of the waves behind the modulated electrons implies a modulation source altitude of 2500–5000 km. We interpret these waves as electromagnetic ion cyclotron waves originating in the auroral acceleration region.
Details
- Title: Subtitle
- Observation of electromagnetic oxygen cyclotron waves in a flickering aurora
- Creators
- E. J Lund - Dartmouth CollegeJ Labelle - Dartmouth CollegeA Ranta - Geophysical Observatory, Sodankylä, FinlandG Haerendel - Max Planck SocietyH. U Frey - Max Planck SocietyR. B Torbert - University of New HampshireK Liou - University of New HampshireW Peria - University of New HampshireC. A Kletzing - Dartmouth coll., dep. physics astronomy, Hanover NH 03755, United StatesM. C Kelley - Cornell UniversityS. D Baker - Cornell UniversityF Primdahl - Technical University of DenmarkH. C STENBAEK-NIELSEN - Dartmouth coll., dep. physics astronomy, Hanover NH 03755, United States
- Resource Type
- Journal article
- Publication Details
- Geophysical research letters, Vol.22(18), pp.2465-2468
- Publisher
- American Geophysical Union
- DOI
- 10.1029/95GL02409
- ISSN
- 0094-8276
- eISSN
- 1944-8007
- Language
- English
- Date published
- 1995
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984199741502771
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