EMPIRICAL CORRELATIONS IN THERMOSPHERIC NO DENSITY MEASURED FROM ROCKETS AND SATELLITES

The diurnal, latitude, solar flux, and geomagnetic activity variations in thermospheric NO density measured at latitudes as high as 70-degre es have been parameterized with a simple, empirical model. Consistent trends are found in both rocket and satellite measurements, although t here are some differences that suggest the presence of systematic erro rs that add factor of 2 uncertainties to the model predictions. While NO measurements taken with IR emission and gamma band fluorescence tec hniques are in reasonable agreement, evidence suggests that the ion co mposition and continuum chemiluminescence methods may be less accurate . The current model provides a convenient means for estimating daytime and nighttime NO densities for use in atmospheric chemistry and radia tion studies.