Physics
Scientific paper
Oct 1951
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1951amjph..19..403s&link_type=abstract
American Journal of Physics, Volume 19, Issue 7, pp. 403-410 (1951).
Physics
Scientific paper
The semidiurnal barometric oscillation, with maxima at about 10 A.M. and 10 P.M. local solar time, is interpreted according to current theory as an air-tide. Although the lunar tidal force is 2.2 times more powerful than the solar, and hence lunar tides in the oceans are 2.2 times stronger than the solar, this is not found to be the case in the atmosphere. The observations show a solar semidiurnal atmospheric oscillation about 100 times greater than might be expected, and a very feeble lunar oscillation. The difficulty is resolved with a suggestion by Kelvin. This is the famous ``resonance theory,'' and illustrates how the effect of a comparatively small tide-generating force might be magnified, if the atmosphere had a period of free oscillation close to 12 solar hours. The linearized equations of atmospheric oscillations are stated, tidal wind fields indicated, and conclusions summarized.
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