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DC Field | Value | Language |
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dc.contributor.author | Singh, J | - |
dc.contributor.author | Ravindra, B | - |
dc.date.accessioned | 2012-04-09T12:21:44Z | - |
dc.date.available | 2012-04-09T12:21:44Z | - |
dc.date.issued | 2012-03 | - |
dc.identifier.citation | Bulletin of the Astronomical Society of India, Vol. 40, No. 1, pp. 77 – 92 | en |
dc.identifier.issn | 0304-9523 | - |
dc.identifier.uri | http://hdl.handle.net/2248/5746 | - |
dc.description | Open Access | en |
dc.description.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. | en |
dc.language.iso | en | en |
dc.publisher | Astronomical Society of India | en |
dc.relation.uri | http://www.ncra.tifr.res.in/~basi/12March/Abstracts/2012singh_abs.htm | en |
dc.relation.uri | http://adsabs.harvard.edu/abs/2012arXiv1202.5910S | en |
dc.rights | © Astronomical Society of India | en |
dc.subject | Telescopes | en |
dc.subject | Sun: faculae, plages | en |
dc.subject | Sun: general | en |
dc.subject | Sun: activity | en |
dc.title | Twin Telescope observations of the Sun at Kodaikanal Observatory | en |
dc.type | Article | en |
Appears in Collections: | BASI Publications IIAP Publications |
Files in This Item:
File | Description | Size | Format | |
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Twin Telescope observations of the Sun at Kodaikanal Observatory.pdf | 1 MB | Adobe PDF | ![]() View/Open |
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