Observations of noctilucent clouds from Lithuania |
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| Authors: | Audrius Dubietis Peter Dalin Ričardas Balčiūnas Kazimieras Černis |
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| Institution: | 1. Department of Quantum Electronics, Vilnius University, Saul?tekio Ave. 9, bldg. 3, LT-10222 Vilnius, Lithuania;2. Swedish Institute of Space Physics, Box 812, SE-981 Kiruna, Sweden;3. Melioratoriu¸ 6-34, LT-30235 Vidi?k?s, Lithuania;4. Institute of Theoretical Physics and Astronomy, Vilnius University, A. Go?tauto 12, LT-01108 Vilnius, Lithuania;1. Atmospheric and Planetary Science Department, Hampton University, VA, USA;2. High Altitude Observatory, National Center for Atmospheric Research, CO, USA;3. School of Physics, Astronomy and Computational Sciences, George Mason University, VA, USA;4. National Central University, Taiwan;5. University of Science and Technology of China, China;1. Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, CO 80303, USA;2. Center for Space Science and Engineering Research, Bradley Department of Electrical and Computer Engineering, Virginia Tech, Blacksburg, VA 24060, USA;3. GATS Inc., Driggs, ID 83422, USA;4. Institute of Physics, Ernst-Moritz-Arndt-University of Greifswald, Greifswald, Germany;1. Space Sciences Laboratory, University of California, Berkeley, CA 94720, USA;2. MIT Haystack Observatory, Westford, MA, USA;3. Institute of Ionosphere, National Academy of Sciences of Ukraine, Ministry of Education and Science of Ukraine, Kharkov, Ukraine;4. Jicamarca Radio Observatory, Instituto Geofisico del Peru, Lima, Peru;5. Leibniz Institute of Atmospheric Physics at the Rostock University, Germany;6. Electrical and Computer Engineering Department, Miami University, Oxford, OH, USA;7. Center for Geospace Studies SRI International, 333 Ravenswood Avenue, Menlo Park, USA;8. Applied Physics Laboratory, Johns Hopkins University, Laurel, MD, USA;1. Bradley Department of Electrical and Computer Engineering, Virginia Tech, Blacksburg, VA 24061, USA;2. Computational Physics Inc., Boulder, CO 80301, USA;3. Laboratory for Atmospheric and Space Physics and Department of Atmospheric and Oceanic Sciences, University of Colorado, Boulder, CO 80303, USA;1. GATS, Inc., Driggs, ID , USA;2. Space Science Division, Naval Research Laboratory, Washington, DCUSA;3. Virginia Polytechnic Institute, Blacksburg, VA, USA;4. Hampton University, Hampton, VA, USA |
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| Abstract: | We present an analysis of systematic visual and photographic observations of noctilucent clouds seen from Lithuania in the years 1973–2009. The main trends in the noctilucent cloud occurrence frequency and the mean brightness are derived from statistical and correlation analysis. A clear signature of the solar activity cycle is imprinted on the noctilucent cloud occurrence frequency and mean brightness, both showing distinct anti-correlation with the sunspot numbers; however, no statistically significant increase of either noctilucent cloud occurrence frequency or brightness has been detected at least over past 19 yr (1991–2009). The only statistically significant positive trend is established for the numbers of very bright noctilucent cloud displays in the years 1973–2009. The most recent noctilucent cloud observations are linked to variations of local mesospheric temperatures, measured by the Aura satellite. |
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