A Self-Consistent Theory of Triggered VLF Emissions
This work attempts a theoretical self-consistent description of the phenomenon of artificially triggered VLF emissions. The observations of this process are well known (Helliwell, 1965). High power VLF transmitters (e.g. NAA, NPG) transmit monochromatic morse pulses ~ 14 kHz. These signals parallel propagate along a magnetospheric field line in a ducted mode. As a result of interaction with cyclotron resonant electrons such pulses are often observed to ‘trigger’ large amplitude narrow band emissions with sweeping frequencies.
KeywordsWave Field Trap Particle Duct Leakage Trapping Frequency Duct Mode
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