Long term variations in equatorial strato-and mesospheric temperatures

Authors

  • J. V. M. NAIDU Cyclone Warning Centre, Visakhapatnam
  • B. N. MURTHY Space Research Laboratories, Physics Department, Andhra University, Visakhapatnam
  • RAMA CHANDRASEKHAR Space Research Laboratories, Physics Department, Andhra University, Visakhapatnam
  • K. V. V. RAMANA Space Research Laboratories, Physics Department, Andhra University, Visakhapatnam

DOI:

https://doi.org/10.54302/mausam.v31i3.3795

Abstract

M-100 Rocketsonde temperature data of Thumba in the 30 to 80 km height range for the period 1971-74 are analysed for studying the long term variations at 5 km altitude intervals. It is observed that the amplitude of the semi-annual oscillation dominates over that of the annual oscillation in the stratosphere and close to mesopause. However, the amplitude of the annual oscillation shows a quasi-peak around 70 Km altitude. The phase of the semi-annual oscillation is observed to propagate downward from mesopause while the phase of the annual component propagates on to either side from the stratopause. From a vertical time-section prepared after filtering out periods greater than 3 months wave disturbances of a few weeks period with vertical scale sizes greater than 20 Km sides are observed. A power spectral analysis shows a dominant period well, above the noise level at 52.5 days above the stratopause. Secondary peaks of lesser significance are observed with periods between 17.5 and 30.0 days.

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Published

01-07-1980

How to Cite

[1]
J. V. M. NAIDU, B. N. MURTHY, R. CHANDRASEKHAR, and K. V. V. RAMANA, “Long term variations in equatorial strato-and mesospheric temperatures”, MAUSAM, vol. 31, no. 3, pp. 457–460, Jul. 1980.

Issue

Vol. 31 No. 3 (1980): MAUSAM

Section

Shorter Contribution

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