Group velocity of whistlers
Abstract
The dispersion relation of waves in a cold magnetoplasma can be given in the form ∑ı=0p Ai(k)ωı ≡ 0, where ω is the frequency and the coefficients Aı are functions of the wave vector k. The group velocity Vg can be expressed as Vg = -∑i=0p(∂Ai/∂k)ωı/∑i=0piAiωı-1. This equation is used for numerical studies of the slow and fast mode propagation in a one-ion plasma. The slow mode is always guided by the magnetostatic field B0, whereas the fast mode is guided only for frequencies in the ‘whistler band.’ The ‘nose frequency’ for the whistlers decreases as the angle θ = ∠(k, B0) increases.
- Publication:
-
Journal of Geophysical Research
- Pub Date:
- September 1976
- DOI:
- 10.1029/JA081i025p04503
- Bibcode:
- 1976JGR....81.4503J
- Keywords:
-
- Cold Plasmas;
- Group Velocity;
- Ionospheric Propagation;
- Propagation Velocity;
- Whistlers;
- Gyrofrequency;
- Propagation Modes;
- Wave Dispersion;
- Particles and Fields-Ionosphere: Wave propagation