Physics – Plasma Physics
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jgra..108.1160t&link_type=abstract
Journal of Geophysical Research (Space Physics), Volume 108, Issue A4, pp. SMP 9-1, CiteID 1160, DOI 10.1029/2002JA009415
Physics
Plasma Physics
2
Magnetospheric Physics: Plasma Waves And Instabilities, Radio Science: Magnetospheric Physics, Space Plasma Physics: Nonlinear Phenomena, Space Plasma Physics: Wave/Particle Interactions
Scientific paper
We consider the effect of initial phase bunching of energetic electrons on the generation of triggered ELF/VLF emissions in the magnetosphere. The electrons interacted with the primary whistler wave packet form a phase-bunched beam in the velocity space, which serves as a traveling-wave antenna emitting secondary waves. We calculate this antenna field and study its spectral and amplitude characteristics. It is shown that under the typical magnetospheric conditions, the secondary wave field is by about an order of magnitude smaller than the primary wave field. Therefore this antenna field is significant as the seed wave which is further amplified by the same beam via the cyclotron resonant mechanism. The frequency band of the antenna effect is of the order of 100 Hz near the primary-wave frequency. This is consistent with the observed frequency shift of triggered emissions.
Demekhov A. G.
Hayakawa Masahiko
Hobara Yasuhide
Trakhtengerts Yu. V.
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