On the Possibility of Dual Mesospheric Bores

Details On the Possibility of Dual Mesospheric Bores On the Possibility of Dual Mesospheric Bores

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa41b0722d&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SA41B-0722

Other

3329 Mesoscale Meteorology, 3384 Waves And Tides

Scientific paper

M. Kelley and his colleagues have observed a type of "mesospheric bore airglow event" which seems, at first, to defy physical explanation. An ordinary bore event, for example, would display an advancing front where the lower airglow layer would show a bright area propagating into a dark region, whereas the upper airglow layer would show a dark region propagating into a bright region. The waves behind the fronts would also show up as negative images of each other. This was physically explained by Dewan and Picard (1998,2001) in the context of a mesospheric internal bore pushing the lower airglow layer down and the upper one up as it advanced. The mystery presented by Kelley, et al (unpublished) was their observation of an event where the upper airglow layer front was a bright propagating region (going into a dark one) and vise versa for the lower one. This is opposite to the usual case mentioned above. It is a fact that it would be physically impossible to explain this new observation in terms of a single bore; but a complete explanation is possible if the possibility of two bores is demonstrated. The latter will be the purpose of this talk. The physics of such dual internal bores will be described and, as will be seen, tides and gravity waves are involved.

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