Variations of the apparent solar semidiameter observed with the astrolabe of Santiago.

Details Variations of the apparent solar semidiameter observed with the astrolabe of Santiago. Variations of the apparent solar semidiameter observed with the astrolabe of Santiago.

Sep 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...325..825n&link_type=abstract

Astronomy and Astrophysics, v.325, p.825-827

Astronomy and Astrophysics

Astrophysics

28

Astrometry, Sun: Fundamental Parameters, Methods: Observational

Scientific paper

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 empirical evidence 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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