On the ELF generation efficiency of the Tromso heater facility

Details On the ELF generation efficiency of the Tromso heater facility On the ELF generation efficiency of the Tromso heater facility

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18.1971b&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 18, Nov. 1991, p. 1971-1974.

Physics

16

Atmospheric Heating, D Region, Extremely Low Frequencies, Ionospheric Currents, Amplitude Modulation, Magnetic Fields, Magnetic Flux, Mathematical Models

Scientific paper

Using amplitude modulation derived from repetitive pulses of varying duty cycle with the Tromso heater facility, the ratio of the heating to cooling time constants of ELF currents generated in the D-region is estimated. This ratio is found to decrease from 1.03 +/- 0.07 at 510 Hz to 0.28 +/- 0.03 at 6010 kHz. These results, which were obtained using an effective radiated power of 240 MW, suggest that future heater facilities designed to optimize ELF radiation efficiency using the technique of 'beam painting' will have to operate at considerably higher power levels than the Tromso facility if any practical advantages are to be gained.

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