Heliographic latitude dependence of the apparent solar radius

Details Heliographic latitude dependence of the apparent solar radius Heliographic latitude dependence of the apparent solar radius

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...343.1001n&link_type=abstract

Astronomy and Astrophysics, v.343, p.1001-1004 (1999)

Astronomy and Astrophysics

Astrophysics

14

Astrometry, Sun: Fundamental Parameters

Scientific paper

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 similar data obtained at the northern hemisphere with the solar astrolabe of CERGA, France. On the average the results of Santiago and CERGA show a maximum value of the semidiameter around +/-50degr solar latitude and two minimums at +/-25degr and +/-75degr . The amplitude is 0farcs148 +/-0farcs030 . The results of both astrolabes show a rather clear anticorrelation with non facular temperature excess along the solar limb. The temperature data were obtained by other authors from observations made with the Princeton Solar Distortion Telescope.

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