Excitation of banded whistler waves in the magnetosphere

Details Excitation of banded whistler waves in the magnetosphere Excitation of banded whistler waves in the magnetosphere

Jul 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3814108l&link_type=abstract

Geophysical Research Letters, Volume 38, Issue 14, CiteID L14108

Physics

Magnetospheric Physics: Magnetosphere: Outer, Magnetospheric Physics: Numerical Modeling, Magnetospheric Physics: Plasma Waves And Instabilities (2471), Magnetospheric Physics: Radiation Belts

Scientific paper

Linear kinetic dispersion analysis and a two-dimensional electromagnetic particle-in-cell simulation are performed to demonstrate a possible excitation mechanism of banded whistler waves in the magnetosphere outside of the plasmapause. Whistler waves in the lower and the upper bands can be generated simultaneously by the whistler anisotropy instability driven by two bi-Maxwellian electron components with T$\perp$/T$\parallel$ > 1 at different T$\parallel$, independently, where $\parallel$ and $\perp$ denote directions relative to the background geomagnetic field. Given ωe/Ωe, the ratio of the electron plasma frequency to the electron cyclotron frequency, T$\parallel$ of each electron component determines the properties of the excited waves. For the typical magnetospheric condition of 1 < ωe/Ωe < 5 in regions associated with strong chorus emissions, the present study suggests that upper-band waves can be excited by anisotropic electrons below ˜1 keV, while lower-band waves are excited by anisotropic electrons above ˜10 keV. The resultant lower-band waves are generally field-aligned and substantially electromagnetic. However, the excited upper-band waves generally propagate obliquely to the background geomagnetic field with quasi-electrostatic fluctuating electric fields.

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