Measurements of the solar radius in Antalya between 2001-2003

Kilic H., Golbasi O., Chollet F.

SOLAR PHYSICS, vol.229, no.1, pp.5-12, 2005 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 229 Issue: 1
  • Publication Date: 2005
  • Doi Number: 10.1007/s11207-005-4999-1
  • Journal Name: SOLAR PHYSICS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.5-12
  • Akdeniz University Affiliated: No

Abstract

The results of the solar radius measurements from February 2001 to November 2003 with the solar astrolabe at the TUBITAK National Observatory are presented. The mean semi-diameter for the period, corrected for systematic effects such as the Fried parameter and the zenith distance, is found to be 959.29 +/- 0.01 arc sec. A comparison of the monthly averages of the solar radius with the monthly means of sunspot numbers shows that the semi-diameter of the Sun increases with an amplitude of 0.017 arc sec per year in opposite phase with solar cycle 23.