First measurements of the two-dimensional horizontal wave number spectrum from CCD images of the nightglow

Details First measurements of the two-dimensional horizontal wave number spectrum from CCD images of the nightglow First measurements of the two-dimensional horizontal wave number spectrum from CCD images of the nightglow

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....9911449h&link_type=abstract

Journal of Geophysical Research, Volume 99, Issue A6, p. 11449-11460

Physics

33

Atmospheric Composition And Structure: Airglow And Aurora, Atmospheric Composition And Structure: Pressure, Density, And Temperature, Meteorology And Atmospheric Dynamics: Thermospheric Dynamics, Meteorology And Atmospheric Dynamics: Waves And Tides

Scientific paper

A narrow wavelength band CCD camera, built at Aerospace, has been used to obtain images of the OH Meinel (6,2) band and the O2 atmospheric (0,1) band nightglow. The field of view of the camera is approximately 100 by 100 km at an altitude of 90 km, the nominal height of the nightglow. It is shown how Fourier techniques can be applied to these data to optimally smooth the images, to identify the presence of monochromatic waves, and to obtain both the one-dimensional and, for the first time, the two-dimensional horizontal wave number spectrum of gravity waves passing through the emission layers. Both measures of the spectrum depend, to a certain extent, on a technique which makes use of Krassovsky's ɛ ratio. These techniques are applied to sample data taken from May 9, 1989, during the Arecibo Initiative in Dynamics of the Atmosphere (AIDA) campaign in Puerto Rico, and from the recent Collaborative Observations Regarding the Nightglow (CORN) campaign in Illinois. While future papers will describe these data in more detail, a brief comparison is made with recent models of the two-dimensional horizontal wave number spectra presented by Gardner et al. (1993) and Gardner (1994).

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