Physics
Scientific paper
Nov 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990p%26ss...38.1421t&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 38, Nov. 1990, p. 1421-1430. Research supported by SERC and USAF.
Physics
45
Emission Spectra, Hydroxyl Radicals, Near Infrared Radiation, Nightglow, Wave Propagation, Imaging Techniques, Lunar Tides, Mesosphere, Traveling Ionospheric Disturbances, Upper Atmosphere
Scientific paper
Based on video observations of the near infrared OH nightglow emission, wave structures of 5-15 km wavelengths and lifetimes of less than 45 min are investigated in order to determine possible relationships between the occurrence of ripples, lunar high tides, and travelling ionospheric disturbances of auroral origin. Basic statistical techniques are applied to determine the significance of the relationships. No evidence is found to support the propositions that ripples arise from the breakdown of lunar tides in the upper atmosphere, and that they are linked to the solar semidiurnal tide. The tendency for ripples to occur when Kp is falling is considered to be important. A more general mechanism which assumes that ripples arise from a fortuitous interaction of wind and wave motions is proposed, and it is expected that the mechanism can be used for remote sensing of the microscale dynamics of the upper atmosphere in the vicinity of the mesopause.
Hapgood M. A.
Taylor Mary Jane
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