A possible atmospheric pressure wave from the total solar eclipse of 22 July 1990

Physics

Scientific paper

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Atmospheric Pressure, Elastic Waves, Solar Eclipses, Solar Terrestrial Interactions, Pressure Measurement, Wave Propagation

Scientific paper

Total solar eclipses are of importance in studies of pressure waves in the earth's atmosphere, because they provide relatively well defined forcing functions. Over the south east of the U.K. an atmospheric pressure disturbance that might have been a wave caused by the total solar eclipse of 22 July 1990 was observed. At each of three microbarometers, sited at the apices of a triangle of sides 21.5, 27.9 and 35.8 km, the order of a 30 Pa rise and fall in pressure over a period of about 2 h was observed. The direction and speed of travel are weakly constrained but are consistent with an eclipse origin. The nature of the wave is uncertain.

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