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Title: Study of Eddy Diffusion in the Equatorial Stratosphere & Mesosphere over Thumba
Authors: Narayanan, V
Sivadasan, K
Appu, K S
Issue Date: Mar-1976
Publisher: NISCAIR-CSIR, India
Abstract: Chaff dispersion analysis of fifteen successful fibre glass chaff cloud experiments in Soviet M-100 rocket and seven copper chaff cloud experiments in Indian Menaka rocket during the one year period May 1973-July 1974 has been carried out at the Thumba Equatorial Rocket Launching Station (08° 32'N; 76° 52'E). The diffusion coefficients in the equatorial stratosphere and mesosphere are evaluated from the chaff width measurements more or less similar to a previous method with Judi dart rocket system. The piggy back fibre glass chaff cloud experiment with M-100 rocket provided chaff width data in the mesospheric region above 55 km upto the lower thermospheric level 90 km ; while the copper chaff used in the Menaka rocket gave the required measurements in the stratospheric region (22-55 km). The average value of eddy diffusion coefficient in the equatorial stratosphere (22-50 km) is found to be 5 X 106 cm2 sec-1. Its magnitude in the mesosphere (55-80 km) increases to 3 X 107 cm2 sec-1 and above 85 km decreases to the order of 106 cm2 sec-1 as in the stratosphere. A significant seasonal variation in the diffusion coefficient is found. There is considerable increase in the diffusion coefficient in the mesospheric region during summer suggesting strong turbulence in the monsoon period. However, the decrease of the diffusion coefficient noticed particularly around 48 and 78 km may be attributed to the equatorial stratopause and mesopause levels.
Page(s): 42-49
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.05(1) [March 1976]

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