Physics
Scientific paper
Jul 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jgr....85.3360h&link_type=abstract
Journal of Geophysical Research, vol. 85, July 1, 1980, p. 3360-3366.
Physics
14
Coherent Radiation, Earth Magnetosphere, Very Low Frequencies, Wave Propagation, Background Radiation, Wave Interaction
Scientific paper
An experiment is reported which determined that when the input power to the coherent VLF signal antenna is reduced below a 'threshold' value P(t), temporal growth and emission triggering cease. Below P(t) the output is proportional to the input. In a typical experiment the peak received power increased by 24 dB when the input power to the antenna crossed the threshold value of 1000 W. The value of P(t) varied widely depending on the duct involved and on the time; as the power was lowered during multipath propagation, the last duct to be cut-off terminated nearly overhead at Siple, assuming all ducts to be equally active. The minimum radiated power for growth and triggering was 1 W. A possible explanation for the threshold effect is background noise that prevents the instability from getting started, or a drop in temporal growth rate to below zero at low signal level.
Carpenter Donald L.
Helliwell Robert A.
Miller Travis R.
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