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EISCAT observations of pump-enhanced plasma temperature and optical emission excitation rate as a function of power flux

Bryers, Carl and Kosch, Michael and Senior, Andrew and Rietveld, M.T. and Yeoman, T. K. (2012) EISCAT observations of pump-enhanced plasma temperature and optical emission excitation rate as a function of power flux. Journal of Geophysical Research, 117. ISSN 0148-0227

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Abstract

We analyze optical emissions and enhanced electron temperatures induced by high power HF radio waves as a function of power flux using the EISCAT heater with a range of effective radiated powers. The UHF radar was used to measure the electron temperatures and densities. The Digital All Sky Imager was used to record the 630.0 nm optical emission intensities. We quantify the HF flux loss due to self-absorption in the D-region (typically 3–11 dB) and refraction in the F-region to determine the flux which reaches the upper-hybrid resonance height. We find a quasi-linear relationship between the HF flux and both the temperature enhancement and the optical emission excitation rate with a threshold at ∼37.5 μWm−2. On average ∼70% of the HF flux at the upper-hybrid resonance height goes in to heating the electrons for fluxes above the threshold compared to ∼40% for fluxes below the threshold.

Item Type: Article
Journal or Publication Title: Journal of Geophysical Research
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
Faculty of Science and Technology
ID Code: 59655
Deposited By: ep_importer_pure
Deposited On: 30 Oct 2012 15:10
Refereed?: Yes
Published?: Published
Last Modified: 10 Apr 2014 00:17
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/59655

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