The dependence of F-region electron heating on HF radio pump power: Measurements at EISCAT Tromsø

Details The dependence of F-region electron heating on HF radio pump power: Measurements at EISCAT Tromsø The dependence of F-region electron heating on HF radio pump power: Measurements at EISCAT Tromsø

Apr 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012jgra..11704309s&link_type=abstract

Journal of Geophysical Research, Volume 117, Issue A4, CiteID A04309

Physics

Ionosphere: Active Experiments, Ionosphere: Auroral Ionosphere (2704), Radio Science: Ionospheric Physics (1240, 2400), Radio Science: Nonlinear Phenomena (4400, 7839)

Scientific paper

Measurements of ionospheric electron temperature enhanced by the action of a powerful high-frequency radio wave on the F-region at the EISCAT facility near Tromsø, Norway are analyzed to obtain the electron heat source due to the radio wave as a function of transmitter power. The absorption of the wave in the D-region is accounted for and is found to have a significant influence on the F-region heating, especially due to variations in the D-region electron density during the experiment. It is found that the efficiency of F-region heating expressed in terms of the electron heating rate as a function of radio wave power flux is higher at higher transmitter powers. This behavior seems to be consistent with the development of geomagnetic field-aligned plasma density irregularities which are associated with the conversion of the radio wave to electrostatic upper-hybrid waves. At the highest power fluxes, the efficiency appears to be close to 100%.

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