Statistics of gravity waves seen in <formula>O2 nightglow over Bear Lake Observatory

Details Statistics of gravity waves seen in <formula>O2 nightglow over Bear Lake Observatory Statistics of gravity waves seen in <formula>O2 nightglow over Bear Lake Observatory

Apr 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jgr...102.7319w&link_type=abstract

Journal of Geophysical Research, Volume 102, Issue A4, p. 7319-7330

Physics

5

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

Scientific paper

Fluctuations in the O2 nightglow column emission rate and rotational temperature were measured over Bear Lake Observatory on 63 nights, 11 of them nearly coinciding with a mesosphere-lower thermosphere coupling study (MLTCS) campaign on January 20-30, 1993. The instrument allows for simultaneous measurement at 12 points in the sky every 2.4 min. From these the frequency, the horizontal wavelength, and the propagation direction can be measured directly, and from these the horizontal phase velocity and the vertical wavelength can be derived. Frequency spectra are shown to have slopes near to the widely accepted -5/3 law. Correction to intrinsic frequency was made by using the simultaneously acquired winds from the satellite-borne wind imaging interferometer (WINDII). The relation between frequency and horizontal wavenumber was scattered rather than clearly linear, and there was no obvious boundary suggesting severe mesospheric filtering when the vertical wavenumber was plotted against the horizontal. Zonal phase speeds were favored during the January period, but on average the waves were isotropic at speeds above 30 m/s. Absorption of westward traveling waves at speeds less than 30 m/s was evident.

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