Quasilongitudinal approximation for whistlermode waves in the magnetospheric plasma
Abstract
The range of applicability of an improved quasilongitudinal approximation for whistlermode waves in the equatorial magnetosphere (4 ≲ L ≲ 6.6) is specified based on the direct comparison between numerical solutions of the hot electromagnetic dispersion equation with the corresponding analytical quasilongitudinal solutions. It is pointed out that this approximation can be used at frequencies ω less than but not close to the electron gyrofrequency Ω (ω ≲ 0.6 Ω) and wave normal angles θ less than but not close to the resonance cone angle θ_{R}. At ω = 0.8 Ω the analytical results deviate considerably from numerical ones due to the strong damping of the waves, and so the quasilongitudinal solution becomes no longer valid.
 Publication:

Planetary and Space Science
 Pub Date:
 December 1990
 DOI:
 10.1016/00320633(90)90160R
 Bibcode:
 1990P&SS...38.1551S
 Keywords:

 Earth Magnetosphere;
 Refractivity;
 Space Plasmas;
 Wave Dispersion;
 Whistlers;
 Electron Distribution;
 Equatorial Regions;
 Gyrofrequency;
 MaxwellBoltzmann Density Function;
 Geophysics