Enhanced whistler instability produced by suprathermal electrons upstream of the earth's bow shock

Physics

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Magnetosphere Interactions

Scientific paper

Destabilization of the whistler mode by electrons possessing both a temperature anisotropy and a power law tail in particle energy is investigated employing a generalized bi-Lorentzian velocity distribution for the electrons. Such a velocity distribution is a good model for the high energy part of the electron distribution upstream of the Earth's bow shock and in the foreshock. It is found that the generalized bi-Lorentzian distribution is much more strongly unstable to the generation of parallel whistlers than is a bi-Maxwellian with similar temperature anisotropy. The excited wavenumbers and frequencies are smaller than they are for a bi-Maxwellian. It is suggested that this instability might play a role in the generation of some of the low to intermediate frequency (90Ωi<ω<400Ωi) whistler bursts observed upstream of the Earth's bow shock and in the foreshock.

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