Browsing by Subject "calern-gözlemevi usturlap"

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    • Comparison Of Long-term Trend Of Solar Radius With Sunspot Activity And Flare Index 

      Gölbaşı, Orhan; Kılıç, Hüseyin (Springer, Van Godewijckstraat 30, 3311 Gz Dordrecht, Netherlands, 2011-07)
      Results are presented from a study of solar radius measurements taken with the solar astrolabe at the TUBITAK National Observatory (TUG) over seven years, 2001-2007. The data series with standard deviation of 0.35 arcsec ...

    • On Short-Term Periodicity Of The Solar Radius Measurements 

      Gölbaşı, Orhan; Kılıç, Hüseyin (Springer, Van Godewijckstraat 30, 3311 Gz Dordrecht, Netherlands, 2011-06)
      The aim of the present study is to investigate the short-term periodicity in the solar radius measurements and to compare with the short periods in sunspot numbers, sunspot areas and flare index data. The spectral analysis ...