Variations of the apparent solar semidiameter observed with the astrolabe of Santiago
نویسنده
چکیده
Measurements of the Sun semidiameter made with the Danjon astrolabe at Santiago, Chile, and with the magnetograph of the solar telescope of Mount Wilson Observatory during the period 1990-1995, show similar variations in time and with a similar trend as the variation of sunspot number. The consistency of these results obtained at different sites and with rather different observing techniques could be considered as an empirical evidency that a causal connection may exist between the solar activity and the variations of the apparent solar radius as observed at Santiago and Mount Wilson.
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Heliographic latitude dependence of the apparent solar radius
A brief outline is given of the advantages of the drift scan method and of the Danjon astrolabe for measuring the apparent solar radius. An analysis of 2111 measurements of the apparent semidiameter of the Sun made with a modified Danjon astrolabe at Santiago, Chile, shows a significant dependence of the observed semidiameter with the heliographic latitude. These results are confirmed by simila...
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