Kinetic Description of a Whistler Wave Propagating in Plasma Along the Magnetic Field

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Kinetic Description of a Whistler Wave Propagating in Plasma Along the Magnetic Field

Plasma Physics Reports. 2022. Vol. 48. P. 754–767.

Resonant wave-particle interaction represents one of the most important phenomena that determines
spectra of waves and dynamics of high-energy particles in space plasma. This interaction was studied
most comprehensively for the case in which, with high degree of accuracy, plasma can be divided into two
components: a cold component that determines dispersion properties of waves but does not participate in resonance
interaction and a high-energy component characterized by low density relative to that of the hot component,
so that it has no impact on wave dispersion. On the contrary, high-energy particles participate in resonance
interaction with a wave thereby determining its kinetic collisionless damping (or amplification in the
case of unstable plasma). To calculate the damping or growth rate of the wave, distribution function of highenergy
particles is usually assumed to be specified analytically. It is also assumed that the damping or growth
rate is much smaller than the wave frequency. In the present work, we develop an approach to analysis of linear
resonance interaction of whistler waves propagating along an external magnetic field with high-energy
electrons that allows lifting limitations mentioned above and finding the real and imaginary parts of frequency
at arbitrary relation between them for a wave with a given wave vector. Moreover, the electron distribution
function that is not divided into cold and high-energy components can be specified numerically, e.g., based
on satellite measurements of differential particles fluxes. The developed approach is illustrated using electron
fluxes measured by Van Allen Probe-A and MMS satellites as examples.

Research target: Physics

Language: English

DOI

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