Enhanced ELF wave generation efficiency using `O' mode HF heating of the ionosphere: An instrumental explanation

Details Enhanced ELF wave generation efficiency using `O' mode HF heating of the ionosphere: An instrumental explanation Enhanced ELF wave generation efficiency using `O' mode HF heating of the ionosphere: An instrumental explanation

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25.3489b&link_type=abstract

Geophysical Research Letters, Volume 25, Issue 18, p. 3489-3492

Physics

Plasma Physics

Ionosphere: Active Experiments, Electromagnetics: Antennas, Space Plasma Physics: Nonlinear Phenomena, Space Plasma Physics: Active Perturbation Experiments

Scientific paper

In [Barr et al. 1997] we presented ELF signals received near the Tromsø ionospheric heater facility when the heater radiated HF signals amplitude modulated by a 505 Hz square wave. Square wave modulation enabled simultaneous multiple frequency measurements to be made of the signals radiated from the ionosphere as the heater was switched to radiate both `X' and `O' mode HF waves. We found that whereas the first 3 odd harmonics of the square wave (>=1515 Hz) all showed the accepted behaviour of reduced wave excitation on switching from `X' to `O' mode HF heating, the fundamental frequency showed enhanced excitation of more than 10 dB with `O' mode heating. These observations were given an ionospheric explanation in terms of a change from Hall to Pedersen current modulation with the change from `X' to `O' mode HF heating. We present here an alternative analysis, which has both instrumental and ionospheric components and is also able to explain the observations.

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