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- W285716901 abstract "Active experimentation on very-low-frequency (VLF) wave-particle interactions (Helliwell and Katsufrakis 1979) has been the primary purpose of research at Siple Station and many important new VLF wave phenomena have been discovered as a result of research. While ionospheric precipitation effects due to triggered emissions and whistlers have been observed, precipitation effects directly attributable to the Siple VLF transmitter have not. The range of particle energies expected to be precipitated by the Siple transmitter extends from approximately 300 electronvolts to 20 electronvolts (Helliwell 1983). The high-frequency sounding radar installed at Siple Station can effectively monitor the whole ionosphere from approximately 80 to 500 kilometers, therefore offering the potential for detecting wave-induced precipitation effects over the same range of energies. The mechanism causing particle precipitation in the lower ionosphere is a gyroresonant interaction between radiation belt particles and electromagnetic waves, which results in pitch angle scattering of the energetic particles (Kennel and Petschek 1966). A variety of sources for the electromagnetic waves exists, such as whistlers, triggered VLF emissions, or signals from such manmade sources as VLF transmitters or the 50-60 hertz-frequencies radiated by electric power grids. Energetic electrons precipitated by this mechanism can cause secondary ionization, optical emissions, X-ray bursts, andmore » heating in the ionosphere over the altitude range 80-200 kilometers.« less" @default.
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- W285716901 date "1987-01-01" @default.
- W285716901 modified "2023-09-27" @default.
- W285716901 title "A possible identification of very-low-frequency wave-induced precipitation in high-frequency sounding radar measurements" @default.
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