Temperature variation in the mesosphere during solar eclipse

Physics

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Atmospheric Temperature, Mesosphere, Solar Eclipses, Solar Terrestrial Interactions, Lyman Alpha Radiation, Oxygen, Temperature Distribution

Scientific paper

Lyman-alpha extinction profiles obtained in rocket measurements during solar eclipses on May 20, 1966, over Karistos, Greece (Hall, 1970) and on March 7, 1970, over East Quoddy, Canada (Dickinson, 1972) are used to calculate the mesospheric temperature and O2-density profiles. The method and cross sections applied are those of Hall (1972), taking the variation of the absorption cross section with wavelength across the 100-pm-wide solar Lyman-alpha line into account. The results are presented graphically and discussed. Temperature decreases (relative to full-sun-visibility conditions) of 20 and 100 K are found at altitude 80-83 km when the sun is 44 percent (Karistos) or 0.6 percent (East Quoddy) visible, respectively. The O2-density profile at Karistos remained unchanged during the eclipse, but was increased at East Quoddy; possible mechanisms based on dynamical and solar-radiation effects are considered.

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