Supersonic Generation of Atmospheric Waves

Details Supersonic Generation of Atmospheric Waves Supersonic Generation of Atmospheric Waves

Mar 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973natur.242...34b&link_type=abstract

Nature, Volume 242, Issue 5392, pp. 34 (1973).

Physics

15

Scientific paper

Chimonas and Hines1 have pointed out that the Moon's shadow on the Earth's atmosphere during a solar eclipse constitutes a cooling region travelling at supersonic speeds, and may generate atmospheric gravity waves with periods from a couple of minutes up to twelve hours. Atmospheric wave generation by solar eclipses has been observed2-4, though within the source region (the region of total or partial eclipse) the gravity waves have substantially shorter period than outside it. Here I draw an analogy between the supersonic motion of the Moon's shadow and the supersonic motion of the Earth's terminator. The terminator is supersonic between +/- 45° latitudes at all altitudes below 100 km and may therefore generate gravity waves in this region.

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