Physics
Scientific paper
Jul 1965
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1965jatp...27..777g&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 27, no. 7, pp. 777-782, IN1, 783-793
Physics
1
Scientific paper
Observations near Brisbane of direct backscatter echoes at 16 Mc/s from field-aligned irregularities in the constant-height sporadic-E (Esc) layer are interpreted from Booker's (1956) theory of scattering. In order to account fully for the observations, it is necessary to postulate "off-normal" scattering from irregularities, but not refraction within the Esc-layer. Lengths of irregularities (estimated as less than 80 m to greater than 570 m) are of the same orders of magnitude as turbulence eddies. The minimum observed length agrees with auroral observations, suggesting the possibility of a common mechanism for production of irregularities in auroral and temperate zones. The maximum observed length suggests that some irregularities may extend right across the Esc-layer. A reduction in irregularity length associated with "range spreading" in vertical incidence Esc echoes is interpreted as evidence for "ripple" structure in E-region (Bowman, 1960). A greater Esc-layer electron content tends to coincide with a greater Esc-layer vertical thickness.
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