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Browsing by Subject "Coronagraph"

Browsing by Subject "Coronagraph"

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  • Constraining the onset height of coronal mass ejection driven shocks using near-Sun observations in visible and radio wavelengths 
    Kathiravan, C; Priyal, M; Ramesh, R (Springer Nature, 2026-06)
    One of the debated issues about the onset of the type II radio bursts near the Sun is the heliocentric distance (r) at which the associated magnetohydrodynamic (MHD) shocks are formed, and the association of the latter ...
  • Data pipeline architecture and development for VELC onboard Space Solar Mission AdityaL1 
    Singh, J; Prasad, B. R; Sumana, Chavali; Amit Kumar; Varun Kumar; Priyal, Muthu; Venkata Suresh, Narra (Elsevier Ltd., 2022-03-15)
    ADITYA L-1 is India’s first dedicated mission to study Sun and its atmosphere with Visible Emission Line Coronagraph (VELC), a major payload on ADITYA-L1. VELC has provision to make imaging and spectroscopic observations ...
  • Data processing of visible emission line coronagraph onboard ADITYA-L1 
    Priyal, M; Singh, J; Prasad, B. R; Sumana, Chavali; Kumar, Varun; Mishra, Shalabh; Venkata, S. N; Sindhuja, G; Sasikumar Raja, K; Amit Kumar; Krishnan, Sanal; Hegde, Bhavana; Utkarsha, D; Natarajan, V; Somasundaram, P. K; Nagabhushana, S; Kamath, P. U; Kathiravan, S; Mani, V. T; Basavaraju, Suresh; Chavan, Rajkumar; Vemareddy, P; Ravindra, B; Rajaguru, S. P; Nagaraju, K; Mishra, Wageesh; Joshi, Jayant; Samanta, T; Chatterjee, Piyali; Kathiravan, C; Ramesh, R (Elsevier B.V, 2024-07-01)
    ADITYA-L1 is India's first dedicated mission to observe the Sun and its atmosphere from a halo orbit around L1 point. Visible emission line coronagraph (VELC) is the primary payload on board Aditya-L1 to observe the Sun’s ...
  • Exploring the outer emission corona spectroscopically by using Visible Emission Line Coronagraph (VELC) on board ADITYA-L1 mission 
    Singh, J; Prasad, B. R; Venkata Suresh, Narra; Amit Kumar (Elsevier B.V, 2019-07-17)
    It is very important to make the spectrographic observations of the outer emission corona in number of emission lines simultaneously in view of the results of the observations made in [Fe x] 6374 A, [Fe xi] 7892 A, [Fe ...
  • Ground calibration of visible emission line coronagraph on board Aditya-L1 mission 
    Prasad, B. R; Venkata Suresh, Narra; Natarajan, V; Somasundaram, P. K; Kamath, P. U; Mishra, Shalabh; Hegde, Bhavana; Sasikumar Raja, K; Singh, J (SPIE - Society of Photo-Optical Instrumentation Engineers, 2023-10)
    Visible emission line coronagraph (VELC) is the prime payload on board India’s first space solar observatory Aditya-L1. VELC is a unique payload with simultaneous observational capabilities in imaging, spectroscopy, and ...
  • The inner coronagraph on board ADITYA-L1 and automatic detection of CMEs 
    Banerjee, D; Ritesh Patel; Pant, V; ADITYA Team (International Astronomical Union, 2017-07)
    Visible Emission Line Coronagraph (VELC) on board ADITYA-L1 is an internally occulted coronagraph with mirror as its primary objective element. It has a field of view (FOV) starting from 1.05 R –3R. It will observe the ...
  • Issues with external occultation of a coronagraph 
    Bayanna, A. R; Mathew, S. K; Sankarasubramanian, K; Venkatakrishnan, P; Singh, J; Prasad, B. R (Springer, 2011-04)
    This paper addresses some of the issues related to externally occulted solar coronagraph; vignetting and achievable resolution due to an external occulter. The analytical expression by Evans (J Opt Soc Am 38:1083–1085, ...
  • Optical design of visible emission line coronagraph on Indian space solar mission Aditya-L1 
    Raj Kumar, Nalla; Prasad, B. R; Singh, J; Venkata Suresh, Narra (Springer, 2018-04)
    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 ...
  • Optical metrology on primary mirror of visible emission line coronagraph on board Aditya-L1 mission 
    Venkata Suresh, Narra; Singh, Darshika; Venkatasubramanian, N; Budhiraju, Vishweshwar Rao; Hegde, Bhavana; Bhat, Nishchith; Utkarsha, D; Somasundaram, P. K; Ramaswamy, Venkateswaran; Kamath, P. U; Sriram, Kuppuswamy Venkatesan; Prasad, B. R (SPIE-Society of Photo-Optical Instrumentation Engineers, 2022-10)
    The visible emission line coronagraph (VELC) on board the Aditya-L1 mission is an internally occulted reflective coronagraph. It is capable of simultaneous observations of the solar corona in imaging, spectroscopic, and ...
  • Scatter due to Ultraviolet (UV) photopolymerization of molecular contamination on optical surfaces 
    Venkata Suresh, Narra; Prasad, B. R; Somasundaram, P. K; Kathiravan, S; Venkatasubramanian, N; Padavu, U. K; Mani, V. T; Basavaraja, S; Naik, Rajesh (Springer Nature B.V., 2020-12)
    Molecular contamination on optical surfaces is a serious issue for space payloads. For ultraviolet (UV) payloads, molecular contamination results in loss of throughput. Whereas, for visible (VIS) payloads loss of throughput ...
  • Scatter due to Ultraviolet (UV) photopolymerization of molecular contamination on optical surfaces 
    Venkata Suresh, Narra; Prasad, B. R; Somasundaram, P. K; Sriraman, K; Venkatasubramanian, N; Padavu, U. K; Mani, V. T; Basavaraja, S; Naik, R (Springer, 2020-12)
    Molecular contamination on optical surfaces is a serious issue for space payloads. For ultraviolet (UV) payloads, molecular contamination results in loss of throughput. Whereas, for visible (VIS) payloads loss of throughput ...
  • Spectroscopic Studies of the Solar Corona - V. Physical Properties of Coronal Structures 
    Singh, J; Sakurai, T; Ichimoto, K; Muneer, S (Springer, 2003-02)
    Spectra around the 6374 Å [Fex] and 7892 Å [Fexi] emission lines were obtained simultaneously with the 25-cm coronagraph at Norikura Observatory covering an area of 200' '×500' ' of the solar corona. The line width, peak ...
  • Ultraviolet Imaging Telescope on AstroSat 
    Tandon, S. N; Ghosh, S. K; Hutchings, J; Stalin, C. S; Subramaniam, A (Current Science Association, 2017-04)
    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, ...
  • Visible emission line coronagraph on Aditya-L1 
    Prasad, B. R; Banerjee, D; Singh, J; Nagabhushana, S; Amit Kumar; Kamath, P. U; Kathiravan, S; Venkata Suresh, Narra; Rajkumar, N; Natarajan, V; Juneja, Madhur; Somu, Pawan; Pant, V; Shaji, Nigar; Sankarsubramanian, K; Patra, Asit; Venkateswaran, R; Adoni, A. A; Narendra, S; Haridas, T. R; Mathew, S. K; Mohan Krishna, R; Amareswar, K; Jaiswa, Bhavesh (Indian Academy of Science, 2017-08-25)
    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, ...

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