Some aspects of ion‐acoustic whistlers in the ionosphere in the presence of negative ions

Abstract

ABSTRACT. A study is made of the propagation of ion-acoustic whistlers in the atmosphere including the effects of negative ions. The dispersion relation, phase and group velocities of whistlers are discussed. It is shown that the presence of negative ions introduces a critical frequency which, for equal ionic masses, is equal to the ion-cyclotron frequency. Special attention is given to the group travel time of whistlers at mid-latitude and equator so that the role of negative ions on the group travel time can be determined. The cyclotron damping of whistlers in the presence of negative ions has been studied. The velocity distribution, total attenuation and the induced magnetic field are calculated from the temporal as well as spatial cyclotron damping. It is suggested that the attenuation of whistlers may cause heating of the ionosphere. It is also indicated that the measurement of the group travel time from its source to the observer at the satellite would help to diagnose the ionospheric parameters. The results of the analysis are presented by several graphical presentations.

Nonlinear Aspects of Wave Propagation in a Magnetised Plasma in the Presence of Coriolis Force

“…Uberoi and Das (1970) derived the linear dispersion relations for the LCP and RCP waves and showed the existence of the cutoffs and resonances for waves in a cold plasma in the presence of a Coriolis force. Later, Sur et al (1989) investigated the propagation of ion-acoustic whistlers in the ionosphere, considering the effect of negative ions, and obtained the expressions for the cutoff and resonance frequencies.…”

On the study of instability of ion-acoustic waves in relativistic plasma: Unbounded and bounded

“…Regarding propagation of electromagnetic waves through a plasma consisting of negative ions, the works of Das and Uberoi 6 and Uberoi 7 are very important, from which it is seen that the presence of negative ions in the lower ionosphere has significant effects on the diagnosis of the plasma. Later, Sur et al 8 studied the propagation of ion-cyclotron whistlers in the ionosphere by considering the effect of negative ions and calculated the group travel time of whistlers at mid-latitude and the equator and also investigated the damping of the wave in the presence of negative ions. Subsequently, Paul et al 9 and Kashyapi et al 10 showed that the negative ions influence significantly the instability of the waves, as well as shifts of the wave parameters.…”