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Constructing the frequency and wave normal distribution of whistler-mode wave power

Watt, C. E. J., Degeling, A. W. and Rankin, R. (2013) Constructing the frequency and wave normal distribution of whistler-mode wave power. Journal of Geophysical Research: Space Physics, 118 (5). pp. 1984-1991. ISSN 2169-9402

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To link to this item DOI: 10.1002/jgra.50231

Abstract/Summary

We introduce a new methodology that allows the construction of wave frequency distributions due to growing incoherent whistler-mode waves in the magnetosphere. The technique combines the equations of geometric optics (i.e. raytracing) with the equation of transfer of radiation in an anisotropic lossy medium to obtain spectral energy density as a function of frequency and wavenormal angle. We describe the method in detail, and then demonstrate how it could be used in an idealised magnetosphere during quiet geomagnetic conditions. For a specific set of plasma conditions, we predict that the wave power peaks off the equator at ~15 degrees magnetic latitude. The new calculations predict that wave power as a function of frequency can be adequately described using a Gaussian function, but as a function of wavenormal angle, it more closely resembles a skew normal distribution. The technique described in this paper is the first known estimate of the parallel and oblique incoherent wave spectrum as a result of growing whistler-mode waves, and provides a means to incorporate self-consistent wave-particle interactions in a kinetic model of the magnetosphere over a large volume.

Item Type:Article
Refereed:Yes
Divisions:No Reading authors. Back catalogue items
Faculty of Science > School of Mathematical, Physical and Computational Sciences > Department of Meteorology
ID Code:32796
Uncontrolled Keywords:ray tracing; VLF waves; hiss; chorus; diffusion
Publisher:American Geophysical Union

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