The latitudinal gradient of nitric oxide in the thermosphere

Physics

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Atmospheric Composition, Atmospheric Temperature, Latitude, Nitric Oxide, Temperature Gradients, Thermosphere, Atmospheric Models, Explorer 51 Satellite, Incoherent Scattering, Magnetic Effects, Mass Spectroscopy, Oxygen Atoms

Scientific paper

Theoretical calculations of nitric oxide altitude profiles are made at five different latitudes by using neutral temperatures and composition primarily from the MSIS (mass spectrometer and incoherent scatter) model. The nitric oxide calculated for an altitude of 105 km remains nearly constant with increasing latitude. Observations made by the ultraviolet nitric oxide instrument on the Atmosphere Explorer C satellite show that at low magnetic activity (Ap value of approximately 4), the NO density at 105 km agrees with the theory; however, at moderate levels of activity it increases with latitude. This discrepancy between the theoretical and observed latitudinal gradients of nitric oxide suggests the transport of NO from a high latitude source to lower latitudes. At 200 km the theoretical and observed latitudinal gradients are in reasonable agreement, an indication that the knowledge of the local composition and temperature is sufficient to model nitric oxide at this altitude.

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