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Title: Twin Telescope observations of the Sun at Kodaikanal Observatory
Authors: Singh, J
Ravindra, B
Keywords: Telescopes;Sun: faculae, plages;Sun: general;Sun: activity
Issue Date: Mar-2012
Publisher: Astronomical Society of India
Citation: Bulletin of the Astronomical Society of India, Vol. 40, No. 1, pp. 77 – 92
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 have 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.
Description: Open Access
ISSN: 0304-9523
???metadata.dc.rights???: © Astronomical Society of India
Appears in Collections:BASI Publications
IIAP Publications

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