Abstract
Abstract The mesospheric temperature mapper (MTM) measurements on mesospheric OH (6, 2) and O2 (0, 1) band emissions from Maui, Hawaii during July, 2002 show significant day-to-day variability. The nocturnal variability reveals prominent wave signatures with a periodicity ranging from 6 to 13 h. For better characterization of the nocturnal wave in the data, a Krassovsky’s η (∼|η|e iφ) analysis was carried out. Deduced Krassovsky parameters show significant variability, with ranges of |η| ∼ 1.7–3.9 for the OH data and ∼4.3–13 for the O2 data. The phase values of Krassovsky parameters exhibit larger variability, with variations from approximately −91° to +23° for the OH data and −45° to −10° for the O2 data. Comparison of these values with existing observations and models show large deviations from model values and relatively better agreements with the observed values reported by other investigators. The deduced vertical wavelength from |η| and φ indicates that our data is mostly dominated by upward propagating waves with occasional high values ≥100 km, implying possible evanescent waves.
Highlights
Gravity waves and tides play a very important role in carrying energy and momentum from the lower atmosphere to the upper atmosphere
When a propagating wave in the atmosphere passes through an airglow layer, it creates perturbations in density as well as in temperature and, such waves can be characterized based on these induced adiabatic perturbations in the intensity and temperatures of Copyright c The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences; TERRAPUB
As part of Maui-MALT campaign, most of the July 2002 data has already been reported by Taori et al (2005), who elaborated on the presence of a terdiurnal wave in the mesospheric temperature data together with its relation to wind fields
Summary
Gravity waves and tides play a very important role in carrying energy and momentum from the lower atmosphere to the upper atmosphere. We have deduced the Krassovsky parameters and vertical wavelengths for the mesospheric OH and O2 airglow emission data from Maui (20.8◦N, 156.2◦W), Hawaii during the summer months of 2002, when the mesospheric airglow data exhibited a larger population of principal wave with an approximately 8-h periodicity (Taori et al, 2005).
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