Physics
Scientific paper
Oct 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977natur.269..497b&link_type=abstract
Nature, vol. 269, Oct. 6, 1977, p. 497, 498.
Physics
Earth Ionosphere, Gravity Waves, Lunar Shadow, Solar Eclipses, Ionograms, Ionosondes, Ionospheric Propagation, Propagation Velocity, Sporadic E Layer
Scientific paper
Results are presented for measurements of the angle of arrival of a HF radio wave inside the path of totality of a solar eclipse. The measurements were performed to test the prediction that the 'cooling spot' of the lunar shadow of an eclipse, which travels at supersonic speeds through the atmosphere, is a continuous source of atmospheric gravity waves. Ionosonde measurements are analyzed which indicate a considerable change in the tilt angle of the sporadic E layer along the propagation path just after totality, a slow return to the original angle, and several cycles of an initially large-amplitude damped oscillation during the return. An attempt is made to discuss these results in the context of atmospheric gravity waves.
Baulch N. E. R.
Butcher E. C.
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