Sodium nightglow measurements and implications on the sodium photochemistry

Details Sodium nightglow measurements and implications on the sodium photochemistry Sodium nightglow measurements and implications on the sodium photochemistry

Apr 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.1323k&link_type=abstract

Journal of Geophysical Research, vol. 84, Apr. 1, 1979, p. 1323-1327.

Physics

6

Annual Variations, Nightglow, Nocturnal Variations, Photochemical Reactions, Radiation Measurement, Sodium, Emission Spectra, Equinoxes, Luminous Intensity, Reaction Kinetics, Spectrophotometry

Scientific paper

Sodium nightglow measurements made at Sao Jose dos Campos (23.2 deg S) with a tilting filter photometer over a period of two years show that on the average the intensities reach a minimum close to local midnight. Between midnight and dawn the intensity remains fairly constant or increases slightly. The most consistent feature is the premidnight decrease in intensity. Seasonal variations show peak intensities at the equinoxes, the stronger one occurring in autumn. In a few cases the nocturnal variation does not follow the average trend, showing rather strong peaks in intensity which have been related to dynamic effects. Calculations based on the photochemistry described require the reaction rate for Na plus O3 yielding NaO(asterisk) plus O2 to be much larger than the rate for the analogous hydrogen reaction, in agreement with a recent suggestion in the literature that the above reaction proceeds through the so-called electron jump mechanisms.

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