Physics
Scientific paper
Mar 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.2463k&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 95, March 1, 1990, p. 2463, 2464.
Physics
2
Antenna Arrays, Backscattering, High Frequencies, Plasma Antennas, Plasma Spectra, Frequency Distribution, Frequency Modulation, Radiant Flux Density
Scientific paper
The Arecibo HF heater is normally composed of two separate sets of antenna array, transmitting waves vertically at the same frequency and polarization. However, when these two sets of antenna array radiate at slightly different frequencies, the intensities of HF heater-induced plasma lines (HFPLs) can be drastically modulated. In recent Duncan et al.'s (1989) experiments the 100 percent intensity modulation of HFPLs was seen to persist even when the secondary set of antenna array radiated at a few percent of the power transmitted by the primary set of antenna array. An explanation is offered, and it is shown that there exists a minimum power, Pmin, and if the secondary set of antenna array radiates at a power lower than Pmin, the 100-percent intensity modulation of HFPLs will not be observed. The functional dependence of Pmin on the difference frequency of the two sets of antenna array is also predicted for future experiments to corroborate.
Kuo Spencer P.
Lee Ming-Chang
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