Effect of severe geomagnetic storm conditions on atomic oxygen greenline dayglow emission in mesosphere

摘要: Abstract Severe geomagnetic storms and their effects on the 557.7 nm dayglow emission are studied in mesosphere. This study is primarily based photochemical model with necessary input obtained from a combination of experimental observations empirical models. The results presented for low latitude station Tirunelveli (8.7°N, 77.8°E). volume rates calculated using MSISE-90 NRLMSISE-00 neutral atmospheric A comparison made between these two positive correlation amongst rate (VER), O, O2 number densities Dst index has been found. present indicate that variation more than model. maximum depletion VER greenline found to be about 30% at 96 km during main phase one investigated case (which strongest −216 nT). density decreases 22% same storm.The NRLSMSISE-00 does not show any appreciable change O events. also shows altitude peak unaffected by storms. effect storm nightglow studied. It almost no can established variations atmosphere. However, 40% there significant differences NRLMSISE-00.