Blog
About

32
views
0
recommends
+1 Recommend
0 collections
    0
    shares
      • Record: found
      • Abstract: found
      • Article: found
      Is Open Access

      Twin Telescope observations of the Sun at Kodaikanal Observatory

      Preprint

      ,

      Read this article at

      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          We report the design, fabrication and installation of a 'Twin Telescope' at Kodaikanal Observatory intended to augment the ongoing synoptic observations of the Sun that has been carried out since 1904. The telescope uses a 15 cm objective capable of taking Ca-K line filtergrams and photoheliograms in continuum of the full disk of the Sun simultaneously, at a frequency of 0.1 Hz using 2kx2k format CCD cameras. The telescope has been in operation since February 2008 and images are being obtained at a cadence of 5 min during normal observing periods. In case of solar activity, images of the active regions can be taken at a frequency of 1 Hz by restricting the field of view and spatial resolution. In this paper, we describe the telescope, instruments, image acquisition, data calibration and image processing. We also discussed a method of determining the network element and plage area index. The preliminary results show that while the network element covers about 30% of the disk, the percentage of the network element area index varies marginally with the seeing conditions during the day.

          Related collections

          Most cited references 1

          • Record: found
          • Abstract: not found
          • Article: not found

          A dependence on solar cycle of the size of the CA+ network

            Bookmark

            Author and article information

            Journal
            27 February 2012
            1202.5910

            http://arxiv.org/licenses/nonexclusive-distrib/1.0/

            Custom metadata
            17 pages, 10 Figures, to appear in the 2012 March issue of the Bulletin of the Astronomical Society of India
            astro-ph.SR

            Comments

            Comment on this article