Physics
Scientific paper
Jul 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jatp...39..833h&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 39, July 1977, p. 833-841. Research supported by the Australian Research G
Physics
3
Ionospheric Propagation, Radio Scattering, Satellite Transmission, Scintillation, Nocturnal Variations, Sporadic E Layer, Spread F, Very High Frequencies
Scientific paper
Multi-satellite scintillations, at a transmission frequency of 150 MHz, and related vertical-incidence ionosonde data were recorded at Brisbane from November 1973 to January 1976. Quasi-periodic (QP) scintillations, a distinct type of regular amplitude fadings, were most frequently recorded in the 2200 to 0200 LT time interval in the southern summer and also, to a lesser extent, in the autumn. The maximum in the occurrence number of QP scintillations coincided with the largest simultaneous increases in the intensities of nocturnal sporadic-E (Es) and spread-F. The azimuth preference in the occurrence of QP scintillations is similar to the prevailing northwest direction of arrival of ionospheric reflections at Brisbane. The generation of these scintillations seems to be associated with the frontal structure of irregularities responsible for spread-F and Es in southern midlatitudes.
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