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Visible Emission Line Coronagraph on Aditya-L1


Affiliations
1 Indian Institute of Astrophysics, 2nd Block, Koramangala, Bengaluru 560 034, India
2 ISRO Satellite Centre, Old Airport Road, Vimanapura Post, Bengaluru 560 017, India
3 Space Applications Centre, Jodhpur Tekra, Ambawadi Vistar, P.O., Ahmedabad 380 015, India
4 Laboratory for Electro-Optics Systems, First Phase, Peenya Industrial Estate, Bengaluru 560 058, India
5 ISRO Inertial Systems Unit, Vattiyoorkavu PO, Thiruvananthapuram 695 013, India
6 Udaipur Solar Observatory, Near Fatehpur Lake, Shilpgram, Udaipur 313 004, India
 

Solar coronagraph mimics total solar eclipse by blocking the solar disk and enabling the observation of extended coronal atmosphere of the Sun. Visible Emission Line Coronagraph (VELC), on-board Aditya-L1 space mission, is an internally occulted solar coronagraph capable of simultaneous imaging, spectroscopy and spectro-polarimetry close to the solar limb. This payload is designed to study the coronal plasma and heating of the solar corona. Studying development, dynamics and origin of coronal mass ejections and measurement of coronal magnetic fields over active regions are other important science goals. VELC is designed to image the solar corona at 500 nm with an angular resolution of 5" over a field of view (FOV) of 1.05-3 Ro. It also facilitates simultaneous multi-slit spectroscopy at three emission lines, viz. Fe XIV (530.3 nm), Fe XI (789.2 nm) and Fe XIII (1074.7 nm) with a spectral resolution of 28 , 31 and 202 mÅ/pixel respectively, over an FOV of 1.05-1.5 Ro. The payload has a dual-beam spectro-polarimetry channel for magnetic field measurements at 1074.7 nm.

Keywords

Coronagraph, Coronal Mass Ejection, Payload, Solar Corona.
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  • Aditya-L1 first Indian mission to study the Sun; http://www.isro.gov.in/aditya-l1-first-indian-missiontostudy-sun (12 May 2016).

  • Singh, J. et al., Proposed visible emission line space solar coronagraph. Curr. Sci., 2011, 100(2), 167–174.

  • Singh, J., Bayanna, R. and Sankarasubramanian, K., Visible emission line space solar coronagraph: science and optical design. J. Opt., 2013, 42(2), 96–100.

  • Sankarasubramanian, K., Solar coronal studies with Aditya-1 mission. In 31st ASI Meeting, ASI Conference Series, 2013, vol. 9, pp. 43–48.

  • Venkata, S. N., Prasad, B. R., Nalla, R. K. and Singh, J., Scatter studies for visible emission line coronagraph on board ADITYAL1 mission. J. Astron. Telesc. Instrum. Syst., 2017, 3, 014002.

  • Bayanna, R. A., Mathew, S. K., Sankarasubramanian, K., Venkatakrishnan, P., Singh, J. and Prasad, B. R., Issues with external occultation of a coronagraph. Exp. Astron., 2011, 29, 145–153.


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  • Visible Emission Line Coronagraph on Aditya-L1

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Authors

B. Raghavendra Prasad
Indian Institute of Astrophysics, 2nd Block, Koramangala, Bengaluru 560 034, India
Dipankar Banerjee
Indian Institute of Astrophysics, 2nd Block, Koramangala, Bengaluru 560 034, India
Jagdev Singh
Indian Institute of Astrophysics, 2nd Block, Koramangala, Bengaluru 560 034, India
S. Nagabhushana
Indian Institute of Astrophysics, 2nd Block, Koramangala, Bengaluru 560 034, India
Amit Kumar
Indian Institute of Astrophysics, 2nd Block, Koramangala, Bengaluru 560 034, India
P. U. Kamath
Indian Institute of Astrophysics, 2nd Block, Koramangala, Bengaluru 560 034, India
S. Kathiravan
Indian Institute of Astrophysics, 2nd Block, Koramangala, Bengaluru 560 034, India
Suresh Venkata
Indian Institute of Astrophysics, 2nd Block, Koramangala, Bengaluru 560 034, India
N. Rajkumar
Indian Institute of Astrophysics, 2nd Block, Koramangala, Bengaluru 560 034, India
V. Natarajan
Indian Institute of Astrophysics, 2nd Block, Koramangala, Bengaluru 560 034, India
Madhur Juneja
Indian Institute of Astrophysics, 2nd Block, Koramangala, Bengaluru 560 034, India
Pawan Somu
Indian Institute of Astrophysics, 2nd Block, Koramangala, Bengaluru 560 034, India
Vaibhav Pant
Indian Institute of Astrophysics, 2nd Block, Koramangala, Bengaluru 560 034, India
Nigar Shaji
ISRO Satellite Centre, Old Airport Road, Vimanapura Post, Bengaluru 560 017, India
K. Sankarsubramanian
ISRO Satellite Centre, Old Airport Road, Vimanapura Post, Bengaluru 560 017, India
Asit Patra
Space Applications Centre, Jodhpur Tekra, Ambawadi Vistar, P.O., Ahmedabad 380 015, India
R. Venkateswaran
Laboratory for Electro-Optics Systems, First Phase, Peenya Industrial Estate, Bengaluru 560 058, India
Abhijit Avinash Adoni
ISRO Satellite Centre, Old Airport Road, Vimanapura Post, Bengaluru 560 017, India
S. Narendra
ISRO Satellite Centre, Old Airport Road, Vimanapura Post, Bengaluru 560 017, India
T. R. Haridas
ISRO Inertial Systems Unit, Vattiyoorkavu PO, Thiruvananthapuram 695 013, India
Shibu K. Mathew
Udaipur Solar Observatory, Near Fatehpur Lake, Shilpgram, Udaipur 313 004, India
R. Mohan Krishna
ISRO Satellite Centre, Old Airport Road, Vimanapura Post, Bengaluru 560 017, India
K. Amareswari
ISRO Satellite Centre, Old Airport Road, Vimanapura Post, Bengaluru 560 017, India
Bhavesh Jaiswal
ISRO Satellite Centre, Old Airport Road, Vimanapura Post, Bengaluru 560 017, India

Abstract


Solar coronagraph mimics total solar eclipse by blocking the solar disk and enabling the observation of extended coronal atmosphere of the Sun. Visible Emission Line Coronagraph (VELC), on-board Aditya-L1 space mission, is an internally occulted solar coronagraph capable of simultaneous imaging, spectroscopy and spectro-polarimetry close to the solar limb. This payload is designed to study the coronal plasma and heating of the solar corona. Studying development, dynamics and origin of coronal mass ejections and measurement of coronal magnetic fields over active regions are other important science goals. VELC is designed to image the solar corona at 500 nm with an angular resolution of 5" over a field of view (FOV) of 1.05-3 Ro. It also facilitates simultaneous multi-slit spectroscopy at three emission lines, viz. Fe XIV (530.3 nm), Fe XI (789.2 nm) and Fe XIII (1074.7 nm) with a spectral resolution of 28 , 31 and 202 mÅ/pixel respectively, over an FOV of 1.05-1.5 Ro. The payload has a dual-beam spectro-polarimetry channel for magnetic field measurements at 1074.7 nm.

Keywords


Coronagraph, Coronal Mass Ejection, Payload, Solar Corona.

References





DOI: https://doi.org/10.18520/cs%2Fv113%2Fi04%2F613-615