On the peculiar shape of sporadic-E clouds

Details On the peculiar shape of sporadic-E clouds On the peculiar shape of sporadic-E clouds

Sep 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jatp...40.1025f&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 40, Sept. 1978, p. 1025-1028. Research supported by the Australian Research

Physics

5

Cloud Physics, Ionospheric Electron Density, Radio Echoes, Sporadic E Layer, Atmospheric Models, Radar Tracking, Wind Shear

Scientific paper

Theoretical and experimental evidence is presented that sporadic-E clouds are often curved concavely on their lower side so as to focus a radio echo to the ground. The horizontal extreme of observed clouds appears to be approximately 40 km with a central core of very high electron density about 5 km across. To model the observations, a wind shear pattern with a horizontal scale of 5 km is required. Because of their shape which leads to the angle of arrival of echoes changing rapidly the clouds are often difficult to track across the sky using a h.f. radar system. Individual clouds are often observed to be tilted about 10 deg from the horizontal.

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