First results on daytime mesopause OH rotational temperatures using ground-based photometry from equatorial latitudes |
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| Affiliation: | 1. Physical Research Laboratory, Ahmedabad 380 009, India;2. EGRL, Indian Institute of Geomagnetism, Tirunelveli 627 001, India;3. York University, North York, Toronto, Canada, M3J 1P3;1. National Atmospheric Research Laboratory (NARL), Gadanki, India;2. Department of Physics, Sri Venkateswara University, Tirupati, India;3. Research Institute for Sustainable Humanosphere, Kyoto University, Uji, Japan;4. B1, CEEBROS, 47/20, IIIrd Main Road, Chennai, India;5. EGRL, Indian Institute of Geomagnetism (IIG), Mumbai, India;6. Indian Institute of Geomagnetism (IIG), Mumbai, India;7. Space Physics Laboratory, VSSC, Thiruvananthapuram, India;1. Space Physics Laboratory, Vikram Sarabhai Space Center, Trivandrum, 695022, India;2. School of Space and Environment, Beihang University, Beijing, China;3. Thayer School of Engineering, Dartmouth College, Hanover, NH, USA;1. Institute of Meteorology and Oceanography, PLA University of Science and Technology, Nanjing 211101, China;2. State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;3. State Key Laboratory of Space Weather, Chinese Academy of Sciences, Beijing 100190, China;1. Physics Department, Colorado State University, Fort Collins, USA;2. Center of Atmospheric and Space Sciences, Utah State University, Logan, USA;3. Department of Physics and Astronomy, Clemson University, Clemson, USA;1. Department of Physics, Institute of Science, Banaras Hindu University, Varanasi 221005, India;2. Department of Electronics and Communication Engineering, Tripura University, Agartala 799022, India;3. Department of Physics, M.L.S. University, Udaipur 313001, India |
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| Abstract: | ![]()
Daytime mesospheric OH , rotational temperatures were estimated from the measurements of the relative intensities of the rotational lines in the same vibrational band, using the unique multiwavelength daytime photometer, from Tirunelveli (8.7°N; 77.8°E; 0.5°N dip latitude), an equatorial station in the Indian zone. On a couple of days when simultaneous measurements were available in the vicinity of the experimental site, the estimated temperatures compared well with those measured by the Wind Imaging Interferometer (WINDII) onboard the Upper Atmosphere Research Satellite (UARS). These results, the first of their kind, revealed: (1) large day-to-day variabilities; (2) oscillatory features with periodicities ranging from 0.5 to 6 h; and (3) large deviations of ±30–50 K, on occasions, from the MSIS-90 model temperatures. Comparisons have also been made with simultaneous measurements of neutral winds around mesopause altitudes using the Partial Reflection radar from the same site to look for any possible association of neutral dynamical parameters with the mesopause temperature variabilities. These results are presented and discussed. |
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