Measurements of nitric oxide in the stratosphere at 44 N in autumn

Precision of the chemiluminescent instrument for balloon-borne NO measurement was improved by precise determinations of the flow rates of the sample air and the calibration NO in N2 gas. Based on the new calibration of these values, NO mixing ratio in the stratosphere was reanalyzed. The revision of the NO data does not at all alter the form of the diurnal variation. The average of the four NO profiles between 15 and 32 km obtained at 44 N in autumn is given.