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Browsing IIAP Publications by Title

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  • C. Ragoonatha Charry and variable star astronomy 
    Kameswara Rao, N; Vagiswari, A; Thakur, P; Birdie, C (Centre for Astronomy, 2009-11)
    C. Ragoonatha Charry, the First Assistant at Madras Observatory from 1864 to 1880, was not only a noted Indian observational astronomer but also someone who emphasized the need for incorporating modern observationally-based ...
  • C1XS results—first measurement of enhanced sodium on the lunar surface 
    Athiray, P. S; Narendranath, S; Sreekumar, P; Grande, M (Elsevier B.V, 2014-12)
    We describe the first unambiguous evidence of enhanced sodium on the lunar surface revealed by the Chandrayaan-1 X-ray Spectrometer (C1XS). The C1XS onboard the Chandrayaan-1 spacecraft was designed to map the surface ...
  • CA II K bright points and the solar cycle 
    Sivaraman, K. R (Springer, 1984-09)
    We have made number counts of the bright points that populate the interior of the Ca II network in the solar chromosphere for four solar cycles. We find that the number of these fine structures during the solar maximum ...
  • Ca II K Emission from the Solar Chromosphere 
    Sivaraman, K. R (Indian Institute of Astrophysics, Bangalore, 1986)
    The role of the Ca II K line as a reliable diagnostic of the chromospheric activity on the Sun is reviewed. The chromospheric structures seen in this line serve as good indicators of the photospheric magnetic structures ...
  • CA II K Line Profile of the Truly Quiet Sun 
    Sivaraman, K. R; Gupta, S. S; Kariyappa, R (Kluwer Academic Publishers, 1996-01)
    While evaluating the chromospheric variability (solar cycle related or any other) using the Ca II K line (λ3933.684 Å) as an indicator, an essential prerequisite is the knowledge of the profile of a truly quiet Sun in the ...
  • CA II K2V spectral features and their relation to small-scale photospheric magnetic fields 
    Sivaraman, K. R; Livingston, W. C (D. Reidel Publishing Co.,, 1982-10)
    Although the Ca ii K232 network is known to be cospatial with magnetic elements there has been doubt as to the magnetic origin of the fainter K2V points. We demonstrate that weak magnetic elements also lie at the roots of ...
  • The CA II triplet lines as diagnostics of luminosity, metallicity and chromospheric activity in cool stars 
    Mallik, S. G. V (European Southern Observatory, 1997-08)
    CCD spectra of the infrared triplet lines of ionized calcium at 8498, 8542, 8662 have been obtained at a spectral resolution of 0.4 Å in 146 stars brighter than V = +7.0 spanning a range in spectral types from F7 to M4 of ...
  • The CA II triplet lines in cool stars 
    Mallik, S. G. V (European Southern Observatory, 1994-02)
    Observations of the infrared triplet lines of ionized calcium are presented for 91 stars brighter than m_v_=+7.0 in the spectral range F8-M4 of all luminosity classes and over a range of metallicities [Fe/H] from -0.65 to ...
  • Calcium flocculi as an index of solar activity 
    Kuriyan, P. P (Government Observatory, Madras, 1967-12)
  • Calcium K-line profiles as a function of latitude and solar cycle phase 
    Singh, J (Kluwer Academic Publishers, 1990)
  • The calcium K-line profiles as function of latitude and solar cycle phase 
    Singh, J (Elsevier, 2002-05)
    We have monitored the Calcium K-line profiles on daily basis at all the latitudes while integrating the spectrum over the visible longitudes of the Sun by moving a 340 mm solar image at a uniform speed in the E-W direction. ...
  • Calculation of the electron-nucleus scalar-pseudoscalar interaction constant WS for YbF and BaF molecules: A perturbative approach 
    Nayak, M. K; Chaudhuri, R. K (The American Physical Society, 2008-07)
    The P,T -odd interaction constant, WS , for the ground state of YbF and BaF molecules are calculated using the second-order many-body perturbation theory (MBPT) via Z -vector technique. The interaction constant WS reported ...
  • Calibration of a Sky radiometer (Prede) using observations obtained from Hanle and Merak high-altitude stations in Ladakh 
    Shantikumar, N. S; Bagare, S. P; Rajendra, B. S; Campanelli, M; Khatri, P; Dorjey, N (Elsevier B.V, 2014-06-15)
    The present work was carried out to check the performance of a Prede Sky radiometer and the stability of the solar calibration constant (F0s) at two high altitude pristine stations, Hanle and Merak in Ladakh region during ...
  • 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 Calibration of the UVIT Detectors for the ASTROSAT Observatory 
    Leahy, Denis; Postma, J; Hutchings, J. B; Tandon, S. N (Cambridge University Press, 2018-08)
    The UVIT ultraviolet and visual band detectors and electronics for the ASTROSAT observatory were calibrated in the vacuum laboratory at the University of Calgary. This work was supported by the Canadian Space Agengy and ...
  • Calibration of VELC detectors on-board Aditya-L1 mission 
    Mishra, Shalabh; Sasikumar Raja, K; Sanal Krishnan, V. U; Venkata Suresh, Narra; Hegde, Bhavana; Utkarsha, D; Priyal, M; Pawan, Kumar; Natarajan, V; Prasad, B. R; Singh, J; Kamath, P. U; Kathiravan, S; Vishnu, T; Suresha; Savarimuthu, P; Desai, Jalshri H; Kumaran, Rajiv; Sagar, Shiv; Kumar, Sumit; Bamrah, Inderjeet Singh; Amit Kumar (Springer Nature, 2024-04)
    Aditya-L1 is the first Indian space mission to explore the Sun and solar atmosphere with seven multi-wavelength payloads, with Visible Emission Line Coronagraph (VELC) being the prime payload. It is an internally occulted ...
  • Calibration on the Sun for stellar magnetic fields 
    Sivaraman, K. R; Bagare, S. P; Gupta, S. S; Kariyappa, R (Springer, 1987-07)
    The intimate association between the surface magnetic fields and the Ca II K-line emission known to exist on the Sun, holds a promise for using this property to detect the presence of global magnetic fields on Sun-like ...
  • Can bars erode cuspy halos? 
    Kataria, Sandeep Kumar; Mousumi Das (Cambridge University Press, 2019-06)
    One of the major and widely known small scale problem with the Lambda CDM model of cosmology is the “core-cusp” problem. In this study we investigate whether this problem can be resolved using bar instabilities. We see ...
  • Can coronal magnetic structures be quasi-static? 
    Venkatakrishnan, P (Astronomical Society of the Pacific, 1994)

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