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- Title
Calibration of VELC detectors on-board Aditya-L1 mission.
- Authors
Mishra, Shalabh; K, Sasikumar Raja; VU, Sanal Krishnan; Narra, Venkata Suresh; S, Bhavana Hegde; D, Utkarsha; V, Muthu Priyal; S, Pawan Kumar; V, Natarajan; B, Raghavendra Prasad; Singh, Jagdev; P, Umesh Kamath; S, Kathiravan; T, Vishnu; Suresha; P, Savarimuthu; Desai, Jalshri H; Kumaran, Rajiv; Sagar, Shiv; Kumar, Sumit
- Abstract
Aditya-L1 is the first Indian space mission to explore the Sun and solar atmosphere with seven multi-wavelength payloads, with Visible Emission Line Coronagraph (VELC) being the prime payload. It is an internally occulted coronagraph with four channels to image the Sun at 5000 Å in the field of view 1.05 - 3 R ⊙ , and to pursue spectroscopy at 5303 Å, 7892 Å and 10747 Å channels in the FOV (1.05 - 1.5 R ⊙ ). In addition, spectropolarimetry is planned at 10747 Å channel. Therefore, VELC has three sCMOS detectors and one InGaAs detector. In this article, we aim to describe the technical details and specifications of the detectors achieved by way of thermo-vacuum calibration at the CREST campus of the Indian Institute of Astrophysics, Bangalore, India. Furthermore, we report the estimated conversion gain, full-well capacity, and readout noise at different temperatures. Based on the numbers, it is thus concluded that it is essential to operate the sCMOS detectors and InGaAs detector at - 5 ∘ and - 17 ∘ C, respectively, at the spacecraft level.
- Subjects
BENGALURU (India); DETECTORS; SOLAR atmosphere; TECHNICAL specifications; CALIBRATION; INDIUM gallium arsenide; POLARIMETRY
- Publication
Experimental Astronomy, 2024, Vol 57, Issue 2, p1
- ISSN
0922-6435
- Publication type
Article
- DOI
10.1007/s10686-024-09922-2