CO Cameron band and CO2+ UV doublet emissions in the dayglow of Venus: Role of CO in the Cameron band production. Issue 6 (17th June 2013)

• Record Type: Journal Article
• Authors: Bhardwaj, Anil; Jain, Sonal Kumar
• Is Part Of: Journal of geophysical research. Volume 118:Issue 6(2013:Jun.)
• Page Start: 3660
• Page End: 3671
• Publication Date: 2013-06-17
• Subjects: Venus -- UV emission -- CO Cameron band -- Dayglow; Magnetospheric physics -- Periodicals; Space environment -- Periodicals; Cosmic physics -- Periodicals; Planets -- Atmospheres -- Periodicals; Heliosphere (Astrophysics) -- Periodicals; Geophysics -- Periodicals; 523.01
• DOI: 10.1002/jgra.50345
• Languages: English
• ISSNs: 2169-9380

Abstract

Abstract : [1] The present study deals with the model calculations of CO Cameron band and CO 2 + ultraviolet doublet emissions in the dayglow of Venus. The overhead and limb intensities of CO Cameron band and CO 2 + UV doublet emissions are calculated for low, moderate, and high solar activity conditions. Using updated cross sections, the impact of different e‐CO cross sections for Cameron band production is estimated. The electron impact on CO is the major source mechanism of Cameron band, followed by electron and photon impact dissociation of CO2 . The overhead intensities of CO Cameron band and CO 2 + UV doublet emissions are about a factor of 2 higher in solar maximum than those in solar minimum condition. The effect of solar EUV flux models on the emission intensity is ∼30–40% in solar minimum condition and ∼2–10% in solar maximum condition. At the altitude of emission peak (∼135 km), the model predicted limb intensity of CO Cameron band and CO 2 + UV doublet emissions in moderate ( F 10.7=130) solar activity condition is about 2400 and 300 kR, respectively, which is in agreement with the very recently published SPICAV/Venus Express observation. The model limb intensity profiles of CO Cameron band and CO 2 + UV doublet are compared with SPICAV observation. We also calculated intensities of N2 Vegard‐Kaplan UV bands and O I 2972 Å emissions during moderate and high solar activity conditions. Key Points: Detailed model calculation of CO Cameoron and CO2+ UV doublet emissions on Venus Present study shows the importance of e-CO process in Cameron band production Predictions are made for possible VEX UV observation in solar moderate condition