Observations of radio star scintillations and spread-F echoes over a solar cycle

Details Observations of radio star scintillations and spread-F echoes over a solar cycle Observations of radio star scintillations and spread-F echoes over a solar cycle

Jan 1964

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1964jatp...26....1b&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 26, no. 1, pp. 1-23

Physics

3

Scientific paper

Observations of the scintillations of the radio source Cassiopeia A were made at Cambridge on a frequency of 38 Mc/s over the period 1949-1961. The results are presented in the form of curves showing the mean diurnal variation of the scintillation index for each month. The variations of scintillation index with solar time, sidereal time and zenith angle are derived and discussed. Seasonal and solar cycle variations are also considered. Ionograms from Slough were analysed to study the occurrence of spread-F echoes for the period 1949-1960, and the results are compared with the observations of scintillations. Special consideration is given to the variations with the solar cycle, which are opposite for the two phenomena; the scintillation effect is greatest at sunspot maximum, but spread-F echoes occur more frequently at sunspot minimum. It is concluded that at sunspot maximum the ionospheric irregularities which cause radio star scintillations must be mainly above the level of maximum ionization of the F-region, and are therefore unobservable by ground-based sounders. For the years near sun-spot maximum, scintillations occur frequently by day as well as by night. Possible explanations of these daytime scintillations are considered.

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