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High-latitude pump-induced optical emissions for frequencies close to the third electron gyro-harmonic

Kosch, M. J. and Rietveld, M. T. and Kavanagh, A. J. and Davis, C. and Yeoman, T. K. and Honary, F. and Hagfors, T. (2002) High-latitude pump-induced optical emissions for frequencies close to the third electron gyro-harmonic. Geophysical Research Letters, 29 (23). pp. 2112-2115. ISSN 0094-8276

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It has been long established that high-power O-mode HF pumping of the ionosphere can produce artificial optical emissions. 630 nm O(1D) photons are produced by pump-accelerated electrons colliding with the F-layer neutral oxygen. However, the mechanism for artificial electron acceleration remains unclear. Competing theories include Langmuir and upper-hybrid turbulence. Pump-induced HF coherent radar backscatter power is closely linked with upper-hybrid turbulence, both of which are known to reduce when pumping on an electron gyro-harmonic frequency. On 3 November 2000, the EISCAT HF facility was systematically stepped in frequency through the 3rd gyro-harmonic. A significant reduction in the artificial optical intensity coincides with that of CUTLASS radar backscatter power. This is conclusive proof that upper-hybrid turbulence is intimately linked to the mechanism for high-latitude pump-induced aurora, at least for 630 nm photons and the steady state.

Item Type: Journal Article
Journal or Publication Title: Geophysical Research Letters
Uncontrolled Keywords: /dk/atira/pure/researchoutput/libraryofcongress/t1
Departments: Faculty of Science and Technology > School of Computing & Communications
Faculty of Science and Technology > Physics
Faculty of Science and Technology > Lancaster Environment Centre
Faculty of Science and Technology > Engineering
ID Code: 6615
Deposited By: ep_importer_dcs
Deposited On: 21 Apr 2008 12:10
Refereed?: Yes
Published?: Published
Last Modified: 27 Feb 2019 03:29
Identification Number:

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