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Optical design of visible emission line coronagraph on Indian space solar mission Aditya-L1

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dc.contributor.author Raj Kumar, Nalla
dc.contributor.author Prasad, B. R
dc.contributor.author Singh, J
dc.contributor.author Venkata Suresh, Narra
dc.date.accessioned 2020-11-11T01:38:08Z
dc.date.available 2020-11-11T01:38:08Z
dc.date.issued 2018-04
dc.identifier.citation Experimental Astronomy, Vol. 45, No. 2, pp. 219-229 en_US
dc.identifier.issn 1572-9508
dc.identifier.uri http://prints.iiap.res.in/handle/2248/6879
dc.description Restricted Access en_US
dc.description The original publication is available at springerlink.com
dc.description.abstract The ground based observations of the coronal emission lines using a coronagraph are affected by the short duration of clear sky and varying sky transparency. These conditions do not permit to study small amplitude variations in the coronal emission reliably necessary to investigate the process or processes involved in heating the coronal plasma and dynamics of solar corona. The proposed Visible Emission Line Coronagraph (VELC) over comes these limitations and will provide continuous observation 24 h a day needed for detailed studies of solar corona and drivers for space weather predictions. VELC payload onboard India’s Aditya-L1 space mission is an internally occulted solar coronagraph for studying the temperature, velocity, density and heating of solar corona. To achieve the proposed science goals, an instrument which is capable of carrying out simultaneous imaging, spectroscopy and spectro-polarimetric observations of the solar corona close to the solar limb is required. VELC is designed with salient features of (a) Imaging solar corona at 500 nm with an angular resolution of 5 arcsec over a FOV of 1.05Ro to 3Ro (Ro:Solar radius) (b) Simultaneous multi-slit spectroscopy at 530.3 nm [Fe XIV],789.2 nm [Fe XI] and 1074.7 nm [Fe XIII] with spectral dispersion of 28mÅ, 31mÅ and 202mÅ per pixel respectively, over a FOV of 1.05Ro to 1.5Ro. (c) Multi-slit dual beam spectro-polarimetry at 1074.7 nm. All the components of instrument have been optimized in view of the scientific objectives and requirements of space payloads. In this paper we present the details of optical configuration and the expected performance of the payload. en_US
dc.language.iso en en_US
dc.publisher Springer en_US
dc.relation.uri https://doi.org/10.1007/s10686-017-9569-7
dc.rights © Springer
dc.subject Space instrumentation en_US
dc.subject Solar physics en_US
dc.subject Spectrograph en_US
dc.subject Optics en_US
dc.subject Coronagraph en_US
dc.title Optical design of visible emission line coronagraph on Indian space solar mission Aditya-L1 en_US
dc.type Article en_US


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