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.
