Abstract
Abstract. A comprehensive model is developed to study the 7320 Å dayglow emission. The emission profiles are obtained with the help of the recently developed Solar2000 EUV (Extreme Ultra Violet) flux model. These emission profiles are used to construct the morphology of this emission between equator and 45° N in the Northern Hemisphere. A span of five years (2001–2005) is chosen to study the effect of solar activity on the morphology of this emission. The morphology is studied on 3 April which lies under the equinox conditions. In 2001, the solar F10.7 index on the chosen date was as high as 223.1 which is the case of solar maximum. It is found that the intensity of this emission does not vary linearly with the F10.7 solar index. The morphology shows that the region of maximum emission expands towards the higher latitudes as the F10.7 index increases.
Highlights
Over the decades, the airglow measurements have been instrumental in understanding the structure and dynamics of upper atmosphere
We have used F10.7 solar index as 92.2 which is an average value for a day
We do not have the exact value of F10.7 solar index available which could be used in the model under the measurement conditions
Summary
The airglow measurements have been instrumental in understanding the structure and dynamics of upper atmosphere. The highly varying density of atomic oxygen at the thermospheric altitudes has been of a prime interest for researchers over a long period of time. The airglow emission such as 6300 Ais less likely. The atomic oxygen airglow emissions at 8446 Aand 7320 Aoccur at thermospheric altitudes (above 150 km) and have been suggested to be potential indicators to monitor the atomic oxygen density at these heights. McDade et al (1991) has suggested a mechanism to extract atomic oxygen density as well as the solar EUV fluxes from this emission. The atomic oxygen 7320 Ais a very weak emission which generally occurs at the 220–250 km altitude region. Singh: Effect of solar activity on the morphology of 7320 Adayglow emission
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
