Empirical model of atomic nitrogen in the upper thermosphere

Details Empirical model of atomic nitrogen in the upper thermosphere Empirical model of atomic nitrogen in the upper thermosphere

Feb 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82..461e&link_type=abstract

Journal of Geophysical Research, vol. 82, Feb. 1, 1977, p. 461-471.

Physics

Atmospheric Models, Density Measurement, Gas Density, Nitrogen Atoms, Thermosphere, Annual Variations, Atmospheric Composition, Density (Number/Volume), Diurnal Variations, Mass Spectroscopy, Midlatitude Atmosphere, Spherical Harmonics

Scientific paper

Atomic nitrogen number densities in the upper thermosphere measured by the open source neutral mass spectrometer (OSS) on Atmosphere Explorer-C during 1974 and part of 1975 have been used to construct a global empirical model at an altitude of 375 km based on a spherical harmonic expansion. The most evident features of the model are large diurnal and seasonal variations of atomic nitrogen and only a moderate and latitude-dependent density increase during periods of geomagnetic activity. Maximum and minimum N number densities at 375 km for periods of low solar activity are 3.6 x 10 to the 6th/cu cm at 1500 LST (local solar time) and low latitude in the summer hemisphere and 1.5 x 10 to the 5th/cu cm at 0200 LST at mid-latitudes in the winter hemisphere.

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