Physics – Plasma Physics
Scientific paper
Jan 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3502104g&link_type=abstract
Geophysical Research Letters, Volume 35, Issue 2, CiteID L02104
Physics
Plasma Physics
34
Space Plasma Physics: Turbulence (4490), Space Plasma Physics: Nonlinear Phenomena (4400, 6944), Interplanetary Physics: Plasma Waves And Turbulence
Scientific paper
A two-dimensional electromagnetic particle-in-cell simulation in a magnetized, homogeneous, collisionless plasma of electrons and protons has been carried out, demonstrating a forward cascade of whistler turbulence. Enhanced magnetic fluctuation spectra are initially imposed with -0.2 < k $\parallel$ c/ω e < 0.2 and -0.2 < k $\perp$ c/ω e < 0.2 where the directional subscripts denote directions relative to the background magnetic field B o and c/ω e is the electron inertial length. The late-time evolution of the simulation shows a cascade of magnetic fluctuation energy to shorter wavelengths; furthermore, the spectrum is anisotropic with more fluctuation energy at a given wavenumber perpendicular to B o than at the same wavenumber parallel to the background field. The late-time electron velocity distribution shows a magnetic-field aligned signature due to the Landau resonance of the obliquely propagating whistlers.
Gary Peter S.
Li Hui
Saito Shinji
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