Computer Science – Sound
Scientific paper
Aug 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984p%26ss...32..985s&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 32, Aug. 1984, p. 985-1005.
Computer Science
Sound
7
Cyclotron Resonance, Magnetospheric Electron Density, Magnetospheric Instability, Plasma-Electromagnetic Interaction, Trapped Particles, Very Low Frequencies, Whistlers, Atmospheric Sounding, Critical Frequencies, Electron Scattering, Electron Trajectories, High Energy Electrons, Wave Interaction
Scientific paper
The mutual influence between two whistler mode waves, through cyclotron resonant interaction of each wave with the same set of energetic electrons, is analyzed both theoretically and by computer simulations; this two-wave interaction mechanism seems to be an important process in understanding recently observed phenomena in Siple Station VLF multiwave injection experiments. A criterion is established to estimate the threshold for the critical frequency spacing (for given wave amplitudes) for a significant mutual interaction between two monochromatic waves to occur. This criterion is based on the overlap of coherence bandwidths associated with the trapping domains of each wave, and it takes into account the geomagnetospheric medium inhomogeneity. The effects of a perturbing second wave on electrons trapped by a first wave are discussed, considering the general situation of varying-frequency waves, and a simulation model is used to track the motion of test electrons in the two-wave field. Conditions leading to detrapping and subsequent trapping by the second wave of previously first-wave trapped electrons are analyzed, and are noted to suggest the possibility of this phenomenon playing an important role in frequency entrainment and energy exchange between two waves.
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