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This study compares the OV1-10 satellitemeasurements of the integral airglow intensities at 630 nm in the SAR arcregions observed in the northern and southern hemisphere as a conjugatephenomenon, with the model results obtained using the time-dependentone-dimensional mathematical model of the Earth ionosphere and plasmasphere (theIZMIRAN model) during the geomagnetic storm of the period 15–17 February 1967.The major enhancements to the IZMIRAN model developed in this study are theinclusion of He+ ions (three major ions: O+, H+,and He+, and three ion temperatures), the updated photochemistry andenergy balance equations for ions and electrons, the diffusion of NO+and O2+ ions and O(1D) and the revised electroncooling rates arising from their collisions with unexcited N2, O2molecules and N2 molecules at the first vibrational level. Theupdated model includes the option to use the models of the Boltzmann or non-Boltzmanndistributions of vibrationally excited molecular nitrogen. Deviations from theBoltzmann distribution for the first five vibrational levels of N2were calculated. The calculated distribution is highly non-Boltzmann atvibrational levels v > 2 and leads to a decrease in the calculatedelectron density and integral intensity at 630 nm in the northern and southernhemispheres in comparison with the electron density and integral intensitycalculated using the Boltzmann vibrational distribution of N2. It isfound that the intensity at 630 nm is very sensitive to the oxygen numberdensities. Good agreement between the modelled and measured intensities isobtained provided that at all altitudes of the southern hemisphere a reductionof about factor 1.35 in MSIS-86 atomic oxygen densities is included in theIZMIRAN model with the non-Boltzmann vibrational distribution of N2.The effect of using of the O(1D) diffusion results in the decrease of4–6% in the calculated integral intensity of the northern hemisphere and 7–13%in the calculated integral intensity of the southern hemisphere. It is foundthat the modelled intensities of the southern hemisphere are more sensitive tothe assumed values of the rate coefficients of O+(4S) ionswith the vibrationally excited nitrogen molecules and quenching of O+(2D)by atomic oxygen than the modelled intensities of the northern hemisphere

Subauroral red arcs as a conjugate phenomenon: comparison of OV1-10 satellite data with numerical calculations