Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/7276
Title: Optical design of visible emission line coronagraph on Indian space solar mission Aditya-L1
Authors: Raj Kumar, Nalla
Prasad, B. R
Singh, J
Suresh Narra, Venkata
Keywords: Space instrumentation;Coronagraph;Spectrograph;Optics;Solar physics
Issue Date: Apr-2018
Publisher: Springer
Citation: Experimental Astronomy, Vol. 45, No. 2, pp. 219–229
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.
Description: Restricted Access
The original publication is available at springerlink.com
URI: http://hdl.handle.net/2248/7276
???metadata.dc.rights???: © Springer
???metadata.dc.relation.uri???: https://doi.org/10.1007/s10686-017-9569-7
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