Accession Number:

ADA014207

Title:

The Aeronomy of Odd Nitrogen in the Thermosphere. II. Twilight Emissions.

Descriptive Note:

Memorandum rept.,

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON D C

Report Date:

1975-07-01

Pagination or Media Count:

40.0

Abstract:

The previously developed model by Oran et al. 1975 for the aeronomy of odd nitrogen in the thermosphere is used to analyze AE data on Ndoublet D and NO published by Rusch et al. 1975 and the twilight NO emission data of Feldman and Takacs 1974. It is concluded that most NO dissociative recombination events must produce Ndoublet D, that Ndoublet D is quenched by O with a rate of 1 x 10 to the 12th power ccsec, and that the atmospheric O2 quenching rate of Ndoublet D is consistent with the laboratory rate. The major quenching agent of Ndoublet D between 140 and 220 km is atomic oxygen, and this reaction is the major source of Nquadruplet S. The authors predict peak Nquadruplet S densities about 2-6 x 10 to the 7th powercc at 140-150 km, with the variability indicative of the model sensitivity to a factor of 2 change in the OO2 ratio in the thermosphere. The model accurately simulates the twilight emission data of Feldman and Takacs 1974.

Subject Categories:

  • Atmospheric Physics
  • Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE