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|Title:||Angular approximations for waves in a cold magnetoplasma|
|Authors:||Booker, Henry G|
Vats, Hari Om
|Abstract:||Budden [J Atmos & Terr Phys (GB),45 (1983) 213] opined that the traditional quasi-longitudinal (QL) and quasi-transverse (QT) approximations in magneto-ionic theory are wrong. A more general approach to these angular approximations, based` on simplifying the radical in the expressions for the refractive indices of the ordinary and extraordinary waves, is described, showing that the new Budden formulae involve substantially the usual approximations, together with an additional approximation, which, in general, should be avoided. The two versions are comparable at sufficiently high frequencies, but the Budden QL approximation is undesirably restrictive for the whistler wave and the Budden QT approximation is virtually useless for the directed Alfven wave, whereas the traditional approach yields the Gendrin theory of group propagation in the whistler band and the standard treatment of the directed Alfven wave presented I books on magnetohydrodynamics. The validity of long-established and widely used applications of the QL and QT approximations is affirmed.|
|ISSN:||0975-105X (Online); 0367-8393 (Print)|
|Appears in Collections:||IJRSP Vol.19(3) [June 1990]|
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