科研之友
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摘要
Mesospheric airglow measurements of two or three layers were used to characterize both vertical and horizontal parameters of gravity waves. The data set was acquired coincidentally from a multi-channel filter (Multi-3) photometer and an all-sky imager located at Sao Joao do Cariri (7.4 degrees S, 36.5 degrees W) in the equatorial region from 2001 to 2007. Using a least-square fitting and wavelet analysis technique, the phase and amplitude of each observed wave were determined, as well as the amplitude growth. Using the dispersion relation of gravity waves, the vertical and horizontal wavelengths were estimated and compared to the horizontal wavelength obtained from the keogram analysis of the images observed by an all-sky imager. The results show that both horizontal and vertical wavelengths, obtained from the dispersion relation and keogram analysis, agree very well for the waves observed on the nights of 14 October and 18 December 2006. The determined parameters showed that the observed wave on the night of 18 December 2006 had a period of similar to 43.8 +/- 2.19 min, with the horizontal wavelength of 235.66 +/- 11.78 km having a downward phase propagation, whereas that of 14 October 2006 propagated with a period of similar to 36.00 +/- 1.80 min with a horizontal wavelength of similar to 195 +/- 9.80 km, and with an upward phase propagation. The observation of a wave taken by a photometer and an allsky imager allowed us to conclude that the same wave could be observed by both instruments, permitting the investigation of the two-dimensional wave parameter.
- 出版日期2018-5-4
