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Proposed visible emission line space solar coronagraph

Singh, Jagdev and Prasad, Raghavendra B and Venkatakrishnan, P and Sankarasubramanian, K and Banerjee, Dipankar and Bayanna, Raja and Mathew, Shibu and Murthy, Jayant and Subramaniam, Prasad and Ramesh, R and Kathiravan, S and Nagabhushana, S and Mahesh, PK and Manoharan, PK and Uddin, Wahab and Sriram, S and Kumar, Amit and Srivastava, N and Rao, Koteswara and Nagendra, CL and Chakraborthy, P and Sriram, KV and Venkateswaran, R and Krishnamurthy, T and Sreekumar, P and Sarma, KS and Murthy, Raghava and Navalgund, KH and Samudraiah, DRM and Babu, Narayan P and Patra, Asit (2011) Proposed visible emission line space solar coronagraph. In: Current Science (Bangalore), 100 (2). pp. 167-174.

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The outer atmosphere of the sun called the corona has been observed during total solar eclipse for short periods (typically <6 min), from as early as the eighteenth century. In the recent past, space-based instruments have permitted us to study the corona uninterruptedly. In spite of these developments, the dynamic corona and its high temperature (1-2 million K) are yet to be Ally understood. It is conjectured that their dynamic nature and associated energetic events are possible reasons behind the high temperature. In order to study these in detail, a visible emission line space solar coronagraph is being proposed as a payload under the small-satellite programme of the Indian Space Research Organisation. The satellite is named as Aditya-1 and the scientific objectives of this payload are to study: (i) the existence of intensity oscillations for the study of wave-driven coronal heating; (ii) the dynamics and formation of coronal loops and temperature structure of the coronal features; (iii) the origin, cause and acceleration of coronal mass ejections (CMEs) and other solar active features, and (iv) coronal magnetic field topology and three-dimensional structures of CMEs using polarization information. The uniqueness of this payload compared to previously flown space instruments is as follows: (a) observations in the visible wavelength closer to the disk (down to 1.05 solar radii); (b) high time cadence capability (better than two-images per second), and (c) simultaneous observations of at least two spectral windows all the time and three spectral windows for short durations.

Item Type: Journal Article
Publication: Current Science (Bangalore)
Publisher: Indian Academy of Sciences
Additional Information: Copyright of this article belongs to Indian Academy of Sciences.
Keywords: Coronal mass ejection; payload; solar coronagraph; spectral window
Department/Centre: Division of Physical & Mathematical Sciences > Astronomy and Astrophysics Programme
Date Deposited: 14 Mar 2011 09:49
Last Modified: 14 Mar 2011 09:49
URI: http://eprints.iisc.ac.in/id/eprint/36040

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