Physics – Plasma Physics
Scientific paper
Nov 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3422105s&link_type=abstract
Geophysical Research Letters, Volume 34, Issue 22, CiteID L22105
Physics
Plasma Physics
7
Magnetospheric Physics: Plasma Waves And Instabilities (2471), Magnetospheric Physics: Magnetosheath, Space Plasma Physics: Kinetic Waves And Instabilities, Space Plasma Physics: Nonlinear Phenomena (4400, 6944), Space Plasma Physics: Solitons And Solitary Waves (4455)
Scientific paper
Coherent wave emission in the whistler frequency range (0.1-0.5Ω e , where Ω e is the electron cyclotron frequency), consisting of nearly monochromatic wave packets, has recently been observed by several spacecraft in the Earth's plasma environment. In this paper whistler waves generated by an electron temperature anisotropy is studied using particle-in-cell (PIC) simulations. It is shown that during the initial phase of the evolution the exponential wave growth is consistent with linear kinetic dispersion theory. Simultaneously, a reduction of the temperature anisotropy takes place, mainly caused by electron heating parallel to the magnetic field. In the final stage the system reaches conditions of marginal stability which is characterized by wave packets of coherent emissions with a frequency about one half the initial value at maximum instability and such that the phase speed and group velocity coincide. These signatures are shown to relate to whistler oscillitons which are a class of nonlinear stationary waves with superimposed spatial oscillations. The calculated structures for a plasma with β e = 1.0 quantitatively resemble magnetospheric whistler events.
Sauer Ken
Silin I.
Sydora Richard D.
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