Determination of O2 density from Lyman alpha ion chambers

Computer Science – Sound

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Annual Variations, Atmospheric Composition, Ionization Chambers, Lyman Alpha Radiation, Oxygen, Absorption Cross Sections, Atmospheric Density, Nitric Oxide, Optical Thickness, Random Errors, Rocket Sounding, Vertical Distribution

Scientific paper

Molecular oxygen data during spring and fall are deduced from Lyman alpha ion chamber measurements. The data show the existence of wave type structure. Random errors in the technique are estimated from simultaneous independent measurements and are found to be low. A major uncertainty in the densities results from lack of information on the appropriate absorption cross sections of molecular oxygen for the temperatures encountered in the atmosphere. Potentially large overestimates in the densities could result from absorption by nitric oxide above 105 km and to a lesser extent by nitric oxide at lower altitudes and water vapor.

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