Comparison of CCD astrolabe multi-site solar diameter observations

Andrei A., Boscardin S., Chollet F., Delmas C., Golbasi O., Jilinski E., ...Daha Fazla

ASTRONOMY & ASTROPHYSICS, cilt.427, sa.2, ss.717-723, 2004 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 427 Sayı: 2
  • Basım Tarihi: 2004
  • Doi Numarası: 10.1051/0004-6361:20041334
  • Dergi Adı: ASTRONOMY & ASTROPHYSICS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.717-723
  • Anahtar Kelimeler: Sun : general, Sun : fundamental parameters, Sun : photosphere, Sun : activity, RADIUS, SUN
  • Akdeniz Üniversitesi Adresli: Hayır

Özet

Results are presented of measured variations of the photospheric solar diameter, as concurrently observed at three sites of the R2S3 (Reseau de Suivi au Sol du Rayon Solaire) consortium in 2001. Important solar flux variations appeared in that year, just after the maximum of solar activity cycle 23, make that time stretch particularly promising for a comparison of the multi-site results. The sites are those in Turkey, France and Brasil. All observations are made with similar CCD solar astrolabes, and at nearby effective wavelengths. The data reductions share algorithms, that are alike, the outcomes of which are here treated after applying a normalization correction using the Fried parameter. Since the sites are geographically quite far, atmospheric conditions are dismissed as possible causes of the large common trend found.