Measurements of NO, O3, and temperature at 19.8 km during the total solar eclipse of 26 February 1979

Computer Science – Performance

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Atmospheric Composition, Atmospheric Temperature, Nitric Oxide, Ozonometry, Solar Eclipses, Stratosphere, Performance Prediction, Ratios, Temperature Measurement, Trace Elements

Scientific paper

Local measurements of stratospheric NO and O3 mixing ratios and air temperature were made during the total solar eclipse of 26 February 1979. The instrumentation was carried aboard a U-2 aircraft flown at an altitude of 19.8 km in the region near 47 deg N, 112 deg W. Eclipse maximum occurred approximately in the middle of the 2-3/4-hr measurement period. The NO mixing ratio was reduced at least a factor of 25 at the maximum of the eclipse. The decrease and recovery of NO during the passage of the Moon's shadow over the measurement region follows approximately the predictions of two independent models. No change was observed in either the O3 mixing ratio or the air temperature that could be attributed to the eclipse.

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