New cutoff and resonance for dust acoustic waves in dusty mesosphere

The WKB approximation has been employed to study the impacts of dust density inhomogeneity and dust size variation on dust acoustic (DA) wave propagation in the mesosphere. A local dispersion relation is obtained, which introduces one cutoff and one resonance frequency. It is shown that the growth r...

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Bibliographic Details
Published in:Physics of plasmas 2021-01, Vol.28 (1)
Main Authors: Banerjee, Gadadhar, Maitra, Sarit, Dasgupta, Chitrita
Format: Article
Language:English
Subjects:
Acoustic propagation
Acoustic resonance
Acoustic waves
Density
Dust
Inhomogeneity
Mesosphere
Plasma physics
Propagation
Resonance
Size distribution
Slopes
Wave propagation
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Summary:The WKB approximation has been employed to study the impacts of dust density inhomogeneity and dust size variation on dust acoustic (DA) wave propagation in the mesosphere. A local dispersion relation is obtained, which introduces one cutoff and one resonance frequency. It is shown that the growth rate of a gradient instability and the range of the amplifying wave propagation are substantially affected by the dust size distribution and density inhomogeneity. Moreover, in the low dust density region, the amplitude and the steepness of DA increase.
ISSN:1070-664X
1089-7674
DOI:10.1063/5.0035913