Intra-seasonal oscfffations of radio refractive index during southwest monsoon over India

Authors

  • H. N. SRIVASTAVA
  • K. C. SINHARAY
  • R. K. MUKHOPADHYAY

DOI:

https://doi.org/10.54302/mausam.v44i3.3862

Keywords:

Radio refractive index, Microwave propagation, Inter-annual variability, Intra-seasonal oscillation, Southwest monsoon, Low frequency oscillation

Abstract

The study deals with the spatial and temporal variations of intra-seasonal oscillations in radio refractive index during southwest monsoon season over India and islands over Indian seas. Average daily radio refractive index data from 1 June to 30 September and that of the individual years for the period 1969-1986 were subjected to harmonic analysis to investigate the contributions of various periodicities in monsoon radio refractive index. The inter-annual variability of various intra-seasonal oscillations have been studied for each 5° latitudinal strip from 50 oN to 30° N with the help of variance explained by various frequency modes for different years. Variance explained by 30-60 day and 10-20 day modes were studied in relation to monsoon performance.

 

The northward and eastward propagation of30.60 day mod~ was noticed. The 10.20 day mode and seasonal mode dominate at latitudinal belts 5°N.10oN and 25°N-30°N respectively. Between 10°N and 25°N, both 30-60 day and 10-20 day modes occur.

 

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Published

01-07-1993

How to Cite

[1]
H. N. . SRIVASTAVA, K. C. . SINHARAY, and R. K. MUKHOPADHYAY, “Intra-seasonal oscfffations of radio refractive index during southwest monsoon over India”, MAUSAM, vol. 44, no. 3, pp. 271–276, Jul. 1993.

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