Twin Telescope observations of the Sun at Kodaikanal Observatory
Jagdev Singh, B. Ravindra

TL;DR
The paper details the design, implementation, and initial results of a twin telescope at Kodaikanal Observatory for high-cadence solar observations, enhancing long-term solar activity monitoring.
Contribution
It introduces a novel twin telescope system capable of simultaneous Ca-K line and continuum imaging, improving solar observation capabilities since 2008.
Findings
Network element covers about 30% of the solar disk.
Network element area index varies marginally with seeing conditions.
Telescope achieves 5-minute cadence for regular observations.
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.…
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Taxonomy
TopicsSolar and Space Plasma Dynamics · Solar Radiation and Photovoltaics · Adaptive optics and wavefront sensing
