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EISCAT observations of pump-enhanced plasma temperature and optical emission excitation rate as a function of power flux
journal contribution
posted on 2012-10-24, 08:57 authored by CJ. Bryers, M. J. Kosch, A. Senior, M. T. Rietveld, T. K. Yeoman[1] 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.
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Citation
Journal of Geophysical Research A: SPACE PHYSICS, 2012, 117 (9)Version
- VoR (Version of Record)
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Journal of Geophysical Research A: SPACE PHYSICSPublisher
American Geophysical Union (AGU); Wileyissn
0148-0227Copyright date
2012Available date
2012-10-24Publisher DOI
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http://onlinelibrary.wiley.com/doi/10.1029/2012JA017897/abstractLanguage
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