Please use this identifier to cite or link to this item: http://nopr.niscair.res.in/handle/123456789/36093
Title: Seasonal and solar cycle trends in planetary wave-induced perturbations in radio wave absorption
Authors: Rao, D N Madhusudhana
Devi, M Indira
Raghava, Y V P K
Ramana, K V V
Issue Date: Aug-1992
Publisher: NISCAIR-CSIR, India
Abstract: Time series of noon radio wave absorption from three tropical and extra-tropical stations during the high solar activity years 1958 and 1959 and low solar activity years 1964 and 1965 subjected to power spectral analysis by the maximum entropy method (MEM) show evidence of the presence of equatorial Kelvin and mixed Rossby gravity wave-induced perturbations in the tropical mesosphere. Rossby gravity wave-induced perturbations feature in the extra-tropical mesosphere. The transient wave variance, present in all seasons, is more intense in high solar activity period. Composite tropical mesospheric variance consists of both fast and slow Kelvin wave components together with the 2-day wave. Extra-tropical variance during winter is dominated by the ZWN 1 10-day wave in the high solar activity years and by the ZWN 2 4-day wave in low activity years. The 2-day wave evokes greater response in summer and autumn and the 5-day wave has no measurable impact during winter.
Page(s): 234-236
URI: http://nopr.niscair.res.in/handle/123456789/36093
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.21(4) [August 1992]

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