Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2012-02-27
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
17 pages, 10 Figures, to appear in the 2012 March issue of the Bulletin of the Astronomical Society of India
Scientific paper
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.
Ravindra B.
Singh Jagdev
No associations
LandOfFree
Twin Telescope observations of the Sun at Kodaikanal Observatory does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Twin Telescope observations of the Sun at Kodaikanal Observatory, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Twin Telescope observations of the Sun at Kodaikanal Observatory will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-263453