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|Title:||EISCAT observations of pump-enhanced plasma temperature and optical emission excitation rate as a function of power flux|
Kosch, M. J.
Rietveld, M. T.
Yeoman, T. K.
|Publisher:||American Geophysical Union (AGU); Wiley|
|Citation:||Journal of Geophysical Research A: SPACE PHYSICS, 2012, 117 (9)|
|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.|
|Rights:||Copyright © 2012 by the American Geophysical Union. All rights reserved. Archived with reference to Usage Permissions granted to authors, available at http://publications.agu.org/author-resource-center/usage-permissions/|
|Appears in Collections:||Published Articles, Dept. of Physics and Astronomy|
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