|
|
 |
|
|
Ann. Geophys., 23, 1433-1439, 2005
www.ann-geophys.net/23/1433/2005/
© European Geosciences Union 2005
Dispersion properties of ducted whistlers, generated by lightning discharge
D. L. Pasmanik and V. Y. Trakhtengerts
Institute of Applied Physics RAS, Nizhny Novgorod, Russia
Abstract. Whistler-mode wave propagation in magnetospheric ducts of
enhanced cold plasma density is studied. The case of the arbitrary
ratio of the duct radius to the whistler wavelength is considered,
where the ray-tracing method is not applicable. The
set of duct eigenmodes and their spatial structure are analysed
and dependencies of eigenmode propagation properties on the duct
characteristics are studied. Special attention is paid to the
analysis of the group delay time of one-hop propagation of the
whistler wave packet along the duct. We found that, in contrast
to the case of a wide duct, the group delay time in a rather narrow
duct decreases as the eigenmode number increases. The results obtained
are suggested for an explanation
of some types of multi-component whistler signals.
Full Article in PDF (393 KB) |
|
|
