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Browsing by Subject "Spectropolarimetry"

Browsing by Subject "Spectropolarimetry"

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  • Calibration of Spectropolarimetry package for Visible Emission Line Coronagraph (VELC) on board Aditya-L1 mission 
    Venkata Suresh, Narra; Hegde, Bhavana; Dasamantarao, Utkarsha; Somasundaram, P. K; Kamath, P. U; Prasad, B. R (World Scientific Publishing Company, 2023-12)
    Visible Emission Line Coronagraph (VELC) is the prime payload on board Aditya-L1 mission. One of the unique capabilities of VELC is the coronal magnetic field measurements from space. To achieve this, VELC performs dual ...
  • The development of HISPEC for Keck and MODHIS for TMT: science cases and predicted sensitivities 
    Konopacky, Quinn M; Baker, Ashley D; Mawet, Dimitri; Fitzgerald, Michael P; Jovanovic, Nemanja; Beichman, Charles; Ruane, Garreth; Bertz, Rob; Terada, Hiroshi; Dekany, Richard; Lingvay, Larry; Kassis, Marc; Anderson, David; Tamura, Motohide; Benneke, Bjorn; Beatty, Thomas; Do, Tuan; Nishiyama, Shogo; Plavchan, Peter; Wang, Jason; Wang, Ji; Burgasser, Adam; Ruffio, Jean-Baptiste; Zhang, Huihao; Brown, Aaron; Fucik, Jason; Gibbs, Aidan; Gibson, Rose; Halverson, Sam; Johnson, Christopher; Karkar, Sonia; Kotani, Takayuki; Kress, Evan; Leifer, Stephanie; Magnone, Kenneth; Maire, Jerome; Pahuja, Rishi; Porter, Michael; Roberts, Mitsuko; Sappey, Ben; Thorne, Jim; Wang, Eric; Artigau, Etienne; Blake, Geoffrey A; Canalizo, Gabriela; Chen, Guo; Doppmann, Greg; Doyon, Rene; Dressing, Courtney; Fang, Min; Greene, Thomas; Herczeg, Greg; Hillenbrand, Lynne; Howard, Andrew; Kane, Stephen; Kataria, Tiffany; Kempton, Eliza; Knutson, Heather; Lafrenière, David; Liu, Chao; Metchev, Stanimir; Millar-Blanchaer, Max; Narita, Norio; Pandey, G; Rajaguru, S. P; Robertson, Paul; Salyk, Colette; Sato, Bun’ei; Schlawin, Evertt; Sengupta, S; Sivarani, T; Skidmore, Warren; Vasisht, Gautam; Yasui, Chikako; Zhang, Hui (SPIE-The International Society for Optical Engineering, 2023-10)
    HISPEC is a new, high-resolution near-infrared spectrograph being designed for the W.M. Keck II telescope. By offering single-shot, R 100,000 spectroscopy between 0.98 – 2.5 µm, HISPEC will enable spectroscopy of transiting ...
  • Do Hα Stokes V Profiles Probe the Chromospheric Magnetic Field? An Observational Perspective 
    Mathur, Harsh; Nagaraju, K; Joshi, Jayant; de la Cruz Rodriguez, Jaime (American Astronomical Society, 2023-03-20)
    We investigated the diagnostic potential of the Stokes V profile of the Hα line to probe the chromospheric line-ofsight (LOS) magnetic field (BLOS) by comparing the BLOS inferred from the weak field approximation (WFA) ...
  • Fast Iterative Techniques for Polarized Radiative Transfer in Spherically Symmetric Moving Media 
    Megha, A; Sampoorna, M; Nagendra, K. N; Anusha, L. S; Sankarasubramanian, K (IOP Publishing, 2020-11-01)
    For a more precise modeling of polarized spectral lines formed in extended and expanding stellar atmospheres, the solution of the radiative transfer equation for the Stokes vectors must be obtained in a spherical geometry ...
  • High precision full stokes spectropolarimetry of the sun as a star instrument design aspects 
    Souvik Bose (Indian Institute of Astrophysics, 2016-07)
    The sun is very interesting particularly because it is very dynamic. The magnetic field plays a major role in governing dynamics of the sun. Many interesting features like sunspots, flares, prominences, and Coronal Mass ...
  • Influence of Thomson Electron Scattering Redistribution on Spectral Line Polarization Formed in Spherically Symmetric Extended and Expanding Atmospheres 
    Sampoorna, M; Megha, A; Supriya, H. D (American Astronomical Society, 2022-09-20)
    Scattering of line photons by ambient electrons in thermal motion in the stellar atmosphere modifies the wings of both intensity and linear polarization profiles of the spectral lines. The aim of the present paper is to ...
  • Polarization of Rotationally Oblate Self-luminous Exoplanets with Anisotropic Atmospheres 
    Chakrabarty, Aritra; Sengupta, S; Marley, Mark S (American Astronomical Society, 2022-03-01)
    The young self-luminous giant exoplanets are expected to be oblate in shape, owing to the high rotational speeds observed for some objects. Similar to the case of brown dwarfs, the thermal emission from these planets should ...
  • Solar coronal magnetic fields and sensitivity requirements for spectropolarimetry channel of VELC onboard Aditya-L1 
    Sasikumar Raja, K; Venkata Suresh, Narra; Singh, J; Prasad, B. R (Elsevier, 2022-01-01)
    Understanding solar coronal magnetic fields is crucial to address the long-standing mysteries of the solar corona and solar wind. Although routine photospheric magnetic fields (MFs) are available for decades, coronal MFs ...
  • Solar Radio Spectro-polarimeter (50–500 MHz). I. Design, Development, and Characterization of a Cross-polarized, Log-periodic Dipole Antenna 
    Kumari, Anshu; Gireesh, G. V. S; Kathiravan, C; Mugundhan, V; Barve, Indrajit V; Ramesh, R; Monstein, C (American Astronomical Society, 2023-12-01)
    The Zeeman effect has been routinely used to image and quantify the solar photospheric magnetic field (B). Such a direct measuring technique is not yet available for the corona (Lin et al. 2004). Since almost all ...
  • Spectropolarimetry of an active region at the photosphere and chromosphere 
    Nagaraju, K; Sankarasubramanian, K; Rangarajan, K. E (Astronomical Society of the Pacific, 2009-06)
    Initial results on the simultaneous spectropolarimetric observations of an active region at the photosphere and chromosphere are presented. For this purpose, the Fe I line at λ6569 and the H I at λ6563 (Hα) are used. ...
  • Spectropolarimetry package for visible emission line coronagraph (VELC) on board Aditya-L1 mission 
    Venkata Suresh, Narra; Prasad, B. R; Singh, J (Springer, 2022-02)
    One of the unique features of Visible Emission Line Coronagraph (VELC) on board Aditya-L1 mission is spectropolarimetric observations in coronal emission line centred at 10747 Å. Spectropolarimetric observations at 10747 ...

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