First summer results on winds in the upper mesosphere derived from the 843 nm hydroxyl emissions measured from the Bear Lake Observatory,Utah |
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| Institution: | 1. Atmospheric Physics Laboratory, University College London, 67-73, Riding House Street, London W1P 7PP, U.K.;2. Center for Atmospheric and Space Science, Utah State University, Loggan, Utah, UT 84322-4405, U.S.A.;1. The University of Sheffield, Department of Physics, Sheffield, S3 7RH, U.K.;1. Mortimer B. Zuckerman Mind, and Brain and Behavior Institute, Columbia University, New York, NY 10027, USA;2. Department of Genetics and Development, Columbia University Irving Medical Center, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA;3. Department of Microbiology, Icahn School of Medicine at Mt. Sinai, New York, NY 10029, USA;4. Center for Disease Neurogenomics, Icahn School of Medicine at Mt. Sinai, New York, NY 10029, USA;5. Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mt. Sinai, New York, NY 10029, USA;6. Icahn Institute for Data Science and Genomic Technology, Icahn School of Medicine at Mt. Sinai, New York, NY 10029, USA;7. Baylor Genetics, 2450 Holcombe Blvd, Houston, TX 77021, USA;8. Department of Biological Sciences, Columbia University New York, NY 10027, USA;9. Department of Cell Biology and Human Anatomy, School of Medicine, University of California at Davis, Davis, CA 95616, USA;10. Department of Pathology and Cell Biology, Columbia University Irving Medical Center, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA;11. Department of Psychiatry, Icahn School of Medicine at Mt. Sinai, New York, NY 10029, USA;12. Department of Otolaryngology, Head and Neck Surgery, Columbia University Irving Medical Center, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA;13. Department of Biochemistry and Molecular Biophysics, Columbia University Irving Medical Center, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA;1. Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;2. Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China;1. Department of Psychology, Stanford University, United States;2. Department of Psychiatry and Behavioral Sciences, Weill Institute for Neurosciences, University of California, San Francisco, United States;3. Department of Psychology, Harvard University, United States;1. Membrane Technology & Research, Inc, 39630 Eureka Dr., Newark, CA 94560, USA;2. The University of Texas at Austin, Department of Chemical Engineering, 200 E. Dean Keeton St., Stop C0400, Austing, TX 78712-1589, USA;1. Key Laboratory of Vehicle Advanced Manufacturing, Measuring and Control Technology (Beijing Jiaotong University), Ministry of Education, Beijing, China;2. Locomotive ＆ Car Research Institute, China Academy of Railway Sciences, Beijing, China;3. Beijing Zongheng Electro-Mechanical Technology Co., Ltd, Beijing, China |
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| Abstract: | The Imaging Fabry-Perot Interferometer (IFPI) at the Bear Lake Observatory (BLO), Utah (41.9°N, 111.4°W) is used for studies of the aeronomy of the middle and upper atmosphere. Wind and temperature structure can be determined from observations of the Doppler shift and Doppler broadening of the airglow and auroral emissions from the mesosphere and thermosphere. The mesospheric winds recorded at the end of August, September and early October 1992 are consistent with a semi-diurnal tidal variation. The amplitude of this variation is approximately 30 ms−1 at the end of August and early September and approximately 20 ms−1 at the end of September and early October. However, during June and July, the semi-diurnal tidal variation, if present, is weak, with amplitude < 5 ms−1. No consistent semi-diurnal tidal variation is observed during late October 1992. During the solstice period, antisymmetric tidal components may be preferentially generated in such a way that they can result in destructive interference with the normally dominant symmetric modes, resulting in a decrease of tidal variation. This is consistent with the observed decrease in tides during the June, July and late October periods. Near the equinoxes, however, the excitation of these antisymmetric modes is expected to be weaker, possibly explaining why a pronounced and consistent semi-diurnal tidal variation has been observed during the August, September and early October periods. In contrast, the mesospheric winds derived from the Sheffield Meteor Wind Radar (53.4°N, 1.5°W) reveal a clear semi-diurnal tidal variation throughout the year, with an amplitude that may vary between 15 ms−1 and 50 ms−1, being about 25 ms−1 on average. The IFPI records winds from a region of the atmosphere centred at 87 km, whereas the Sheffield Meteor Wind Radar measures winds centred at 95 km. Therefore, the two regions may experience different tidal modes due to the different latitude, longitude and altitude of the observed regions and/or the different topography of the observing sites. Some proposed reasons for these differences are presented. |
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