Abstract
In this study, the morphology of the oxygen greenline dayglow emission is presented. The volume emission rate profiles are obtained by using Solomon's glow model. The glow model is updated in terms of recent cross sections, reaction rate coefficients and quantum yield of greenline emission. Throughout most of the thermosphere the modelled and observed emission rates are in reasonably good agreement. In the region between 98 and 120 km, the modelled emission rates are substantially higher (about a factor of 1.7) than the observed emission rates. This discrepancy is discussed in terms of scaling of solar fluxes which accounts the variation of solar activity for the day on which calculations are made. The modelled morphology of greenline emission is compared with those cases where WINDII data is available. The modelled and observed morphology is in reasonably good agreement at most of the latitudes above 120 km. In the mesosphere the qualitative nature of morphology is very similar to those of WINDII observation except the modelled emission rates are about a factor of 1.7 higher than the observed emission rates.Keywords. Ionosphere (ion chemistry and composition; modeling and forecasting; solar radiation and cosmic ray effects).
Highlights
In the recent years lot of attention has been paid to study the O(1S) dayglow emission
For the purpose of examining how the present results of greenline dayglow emission rates can explain the WINDII measurements, we have selected a set of volume emission rate pro®les, calculated at various latitudes, during the months of January, April and May 1993
The individual components of O(1S) production are shown in this ®gure. It is noticeable from the pro®les shown in Fig. 1 that the present results are in reasonably good agreement with the WINDII observation above 120 km
Summary
In the recent years lot of attention has been paid to study the O(1S) dayglow emission We present the morphology of atomic oxygen greenline dayglow emission which is obtained using the glow model of Solomon (1992). The O 1S) production rates due to the three body recombination process are calculated using the excitation parameters of McDade et al (1986) which were obtained from simultaneous rocket measurements of greenline night glow and atomic oxygen densities.
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