Computer Science
Scientific paper
Oct 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975rspta.280..137h&link_type=abstract
Royal Society (London), Philosophical Transactions, Series A, vol. 280, no. 1293, Oct. 23, 1975, p. 137-149.
Computer Science
2
Coherent Electromagnetic Radiation, Earth Magnetosphere, Plasma-Electromagnetic Interaction, Radio Transmission, Very Low Frequencies, Whistlers, Bremsstrahlung, Cyclotron Resonance, Electron Precipitation, Lightning, Propagation Modes, Radiation Belts, Satellite Observation, X Rays
Scientific paper
VLF whistler-mode waves in the magnetosphere may be generated by natural lightning and VLF transmitters, or through resonant interactions with radiation belt electrons. Such VLF waves provide information on the hot and cold components of the magnetospheric plasma. Energetic electrons precipitated by whistler-mode waves may generate Bremsstrahlung X-rays and enhance the electron density of the ionosphere. Coherent signals transmitted from the ground can be amplified up to 30 dB in the magnetosphere; the amplified signal may trigger discrete VLF emissions of both rising and falling frequency. VLF line radiation from the magnetosphere is observed, apparently controlled by power line harmonic radiation from the ground. Triggered emission can be explained by using a new principle in which waves and cyclotron-resonant electrons interchange energy through a feedback process.
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