Physics – Plasma Physics
Scientific paper
Feb 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jgra..10902307h&link_type=abstract
Journal of Geophysical Research, Volume 109, Issue A2, CiteID A02307
Physics
Plasma Physics
11
Magnetospheric Physics: Auroral Phenomena (2407), Magnetospheric Physics: Plasma Waves And Instabilities, Space Plasma Physics: Nonlinear Phenomena, Space Plasma Physics: Wave/Particle Interactions
Scientific paper
Several examples of whistler wave packets accompanied by density cavities are detected in F4 experiments of Freja satellite. The density depletion seems to be a fixed structure in space from the cross-correlation of two Langmuir probes. The wavelet analysis shows the frequency drift from 1 kHz (below the low-hybrid frequency) to 200 Hz (below the proton cyclotron frequency). The wave packets are always associated with an extremely low frequency component at 20-30 Hz (around the oxygen ion cyclotron frequency). The method of the minimum variance is used to calculate the oblique propagation of the wave packets with an angle decreased from 31 to 17 degrees between the wave vector and the ambient magnetic field. The right polarization of the wave packets is shown in the direction of the ambient magnetic field. Moreover, the phase velocity of the wave packets is inversely proportional to the frequency. These features may support the formation of envelope solitary whistler waves.
Huang Guang Li
Song Q. W.
Wang De-yu
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