Physics
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19...61t&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 19, Jan. 3, 1992, p. 61-64. Research supported by Stanford University.
Physics
9
Energy Transfer, Extremely Low Frequencies, Ionospheric Heating, Wave Generation, D Region, Hall Effect, High Frequencies, Ionospheric Currents, Ionospheric Electron Density
Scientific paper
A comparative analysis is presented of ionospheric heating and ELF wave generation by VLF to HF waves based on a general formulation of the radiowave absorption and a standard formulation of the transfer of the absorbed wave energy to electrons. The efficiency of VLF vs HF heating for ELF generation via modulation of ambient ionospheric currents induced by a ground-based 'heater' is investigated using a simple model of the total current moment due to the heating. VLF waves are found to be at least as efficient as HF waves in heating lower ionospheric electrons, although the altitude of maximum heating depends sensitively on heater frequency for lower Pd (not more than 10 exp -5 W/sq m at 30 km). VLF heating is at least as efficient as HF heating in terms of generated ELF power per unit wave power density incident on the lower atmosphere. Modulation of Pedersen conductivity is the dominant means of ELF generation for a midlatitude ambient ionosphere.
Bell Timothy F.
Inan Umran S.
Taranenko Yuri N.
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