Physics
Scientific paper
Feb 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20..189k&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 3, p. 189-192.
Physics
13
Electrojets, Extremely Low Frequencies, High Frequencies, Polar Regions, Thermal Stability, Very Low Frequencies, D Region, E Region
Scientific paper
Generation of ELF and VLF waves via a thermal instability process in a HF-modulated polar electrojet has been investigated. It is shown that a positive feedback through the electron-neutral collisional heating process can cause the transient response of the plasma to the modulated HF heater to grow exponentially. The threshold fields of the instability under normal electrojet conditions are found to be about 2.25 V/m and 1.13 V/m for the operation of the o-mode and x-mode heaters with a 50 percent duty cycle, respectively. For a heater wave field of, e.g., 1.5 V/m, the instability can be excited by the x-mode heater within a few tens of millisecond.
Kuo Spencer P.
Lee Ming-Chang
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