The N I (5200 Å) dayglow

Simultaneous measurement of the 5200-A dayglow from the N I (4S-²D) transition, neutral, and ion densities and photoelectron fluxes by Atmosphere Explorer is used to examine the production and loss mechanisms of N(²D) atoms. The branching ratio for production of N(²D) from N2+ + e is found to be larger than the branching ratio for the sum of the processes NO+ + e, N2+ + O, and e + N2. If it is unity, then the effective branching ratio for their latter processes lies in the range 0.34–1.0; the rate for quenching of N(²D) by O lies in the range 1.4–6.3 × 10−13cm³ s−1; the rate for the reaction of N(²D) with O2 lies in the range 0–2.7 × 10−12 cm³ s−1; and the rate for quenching of N(²D) by electrons is ∼1 × 10−9(Te/300)1/2 cm³ s−1. Values nearer the upper ends of these ranges are favored by a comparison between calculated and measured NO. The reaction N+ + O2 → N + O2+ is a small source of N in the thermosphere. A calculation shows that the ratio of N(4S) to O is 0.01–0.02 at 250 km.

[1]  F. Fehsenfeld,et al.  Temperature dependence of some ionospheric ion-neutral reactions from 300°–900°K , 1974 .

[2]  D. Albritton,et al.  Energy dependence and branching ratio of the N2 + + O reaction , 1974 .

[3]  D. Albritton,et al.  Flow‐drift technique for ion mobility and ion‐molecule reaction rate constant measurements. II. Positive ion reactions of N+, O+, and H2+ with O2 and O+ with N2 from thermal to [inverted lazy s]2 eV , 1973 .

[4]  D. Rusch.  Satellite ultraviolet measurements of nitric oxide fluorescence with a diffusive transport model , 1973 .

[5]  W. B. Hanson,et al.  The retarding-potential analyzer on Atmosphere Explorer , 1973 .

[6]  G. Shepherd,et al.  The visible‐airglow experiment on Atmosphere Explorer , 1973 .

[7]  L. H. Brace,et al.  The cylindrical electrostatic probes for Atmosphere Explorer -C, -D, and -E. , 1973 .

[8]  Carl A. Reber,et al.  A neutral‐atmosphere composition experiment for the Atmosphere Explorer‐C, ‐D, and ‐E , 1973 .

[9]  A. Stewart,et al.  The UV nitric‐oxide experiment for Atmosphere Explorer , 1973 .

[10]  J. Hoffman,et al.  The magnetic ion-mass spectrometer on Atmosphere Explorer , 1973 .

[11]  J. P. Doering,et al.  The photoelectron-spectrometer experiment on Atmosphere Explorer. , 1973 .

[12]  F. Kaufman,et al.  Reactions of Metastable Nitrogen Atoms , 1971 .

[13]  L. Jacchia.  Revised static models of the thermosphere and exosphere with empirical temperature profiles , 1971 .

[14]  D. Hunten,et al.  Production and diffusion of nitric oxide , 1970 .

[15]  C. Barth,et al.  Theory of nitric oxide in the Earth's atmosphere , 1970 .

[16]  R. Young,et al.  Vacuum‐Ultraviolet Photolysis of N2O. IV. Deactivation of N(2D) , 1969 .

[17]  V. Carter,et al.  Predissociation in N2 and O2 , 1969 .

[18]  M. A. Biondi,et al.  ELECTRON TEMPERATURE DEPENDENCE OF RECOMBINATION OF O$sub 2$$sup +$ AND N$sub 2$$sup +$ IONS WITH ELECTRONS. , 1969 .

[19]  P. Burke,et al.  SCATTERING OF ELECTRONS BY C, N, O, N$sup +$, O$sup +$, AND O² . , 1969 .

[20]  C. S. Weller,et al.  RECOMBINATION, ATTACHMENT, AND AMBIPOLAR DIFFUSION OF ELECTRONS IN PHOTO- IONIZED NO AFTERGLOWS. , 1968 .

[21]  W. E. Wilson.  Rate Constant for the Reaction N + O2→NO + O , 1967 .

[22]  H. F. Winters.  Ionic Adsorption and Dissociation Cross Section for Nitrogen , 1966 .

[23]  M. Nicolet.  Nitrogen oxides in the chemosphere , 1965 .

[24]  L. F. Phillips,et al.  Mass Spectrometric Studies of Atom Reactions. I. Reactions in the Atomic Nitrogen‐Ozone System , 1962 .