Some aspects of ion-acoustic whistlers in the ionosphere in the presence of negative ions
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...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
1989-01-01
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| Series: | International Journal of Mathematics and Mathematical Sciences |
| Online Access: | http://dx.doi.org/10.1155/S0161171289000931 |
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| Summary: | 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. |
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| ISSN: | 0161-1712 1687-0425 |