Rocket-borne observations of the extinction of solar hydrogen Lyman-alpha radiation made during the solar eclipses of 20 May 1966 at Karistos for normal and 44~ visibility and o f 7 March 1970 at East Quoddy for normal. 10ud ` and 0.6ud visibility have been used to study the variation of temperature in the mesosphere during these events. It is seen that near the mesopause the decrease of temperature at Karistos is by 20 ~ K for 44ud ,,isibility and at East Quoddy by 100O K for 0.6% visibility. Possible causes of these temperature variations visa -vis molecular oxygen and pressure variations have been briefly discussed.
An examination of the Umkehr ozone data of at. Abu from 1953 onwards shows that at the upper stratosphere there is an increasing trend of ozone with increasing level of solar activity. At the lower stratosphere, however, this trend is seen only when analysis is made with the monthly averaged values of ozone separately for separate solar cycle. The ozone values of one solar cycle are found to be different from those of others. From the trend of variation of ozone at the upper and the lower stratosphere, it appears that the changes due to dynamical processes in the lower stratosphere are in phase with the changes due to photochemical processes in the upper stratosphere.
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