Statistical properties of nonlinear wave signatures in OH and O2 airglow brightness data observed at lower midlatitudes |
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| Authors: | Jürgen Scheer Esteban R. Reisin |
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| Affiliation: | 1. Department of Mathematics, City University of Hong Kong, Kowloon, Hong Kong, PR China;2. Professor Emeritus, Tokyo Institute of Technology, Tokyo, Japan;1. Faculty of Geosciences, Department of Physical Geography, Utrecht University, PO Box 80115, 3508 TC Utrecht, The Netherlands;2. Cultural Heritage Agency, PO Box 1600, 3800 BP Amersfoort, The Netherlands;1. Nuclear Regulatory Agency, 69 Shipchenski Prokhod, 1574 Sofia, Bulgaria;2. Institute for Solar Terrestrial Influences—Bulgarian Academy of Sciences, Bl.3 “Acad.Georgi Bonchev” str. 1113 Sofia, Bulgaria;1. Space and Plasma Physics, Royal Institute of Technology, Stockholm, Sweden;2. Department of Physical Sciences, University of Oulu, Finland;3. Space Environment Physics Group, University of Southampton, UK;1. Faculty of Science, University of Zagreb, Horvatovac bb, 10000 Zagreb, Croatia;2. Hvar Observatory, Faculty of Geodesy, Ka?i?eva 26, 10000 Zagreb, Croatia;3. IGAM/Kanzelhöhe Observatory, Institute of Physics, University of Graz, Universitätsplatz 5, 8010 Graz, Austria;4. Helmholtz-Zentrum Potsdam Deutsches GeoForschungsZentrum - GFZ, Telegrafenberg, 14473 Potsdam, Germany |
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| Abstract: | Among 2187 nights of airglow observations of the OH(6-2) and O2b(0-1) bands from Argentina (mainly from El Leoncito, 32°S 69°W), 132 show airglow brightness jumps (ABJs) of short duration (16 min median). ABJs are supposed to be related to mesospheric bores or similar nonlinear waves. Several occurrence patterns were identified, which a successful explanation must take into account. ABJs occur preferably in the OH layer at 87 km, and are less likely in the O2 layer at 95 km, maybe because ducts prefer lower altitudes. The seasonal distribution of nights when ABJs are observed only in the OH layer clearly shows a winter maximum centered around solstice, and equinox minima. In contrast, the seasonal distribution of ABJ nights in O2 is flat. Most ABJs simultaneously present in OH and O2 show anticorrelated variation between both layers. ABJ nights tend to occur in clusters lasting several days, which probably reflects duct lifetime. |
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