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  • VHE gamma-ray astronomy experiments in India - Imaging cerenkov technique 
    Bhat, C. L; Kaul, R. K (Astronomical Society of India, 2002)
    The recent advances in the field of very high energy (VHE) or TeV gamma-ray astronomy, culminating in the unambiguous detection of several galactic and extragalactic sources, owes itself largely to the successful exploitation ...
  • VHE gamma-ray observation of Crab Nebula with HAGAR telescope array 
    Singh, B. B; Britto, R. J; Chitnis, V. R; Shukla, A; Saha, L; Sinha, A; Acharya, B. S; Vishwanath, P. R; Anupama, G. C; Bhattacharjee, P; Gothe, K .S; Nagesh, B. K; Prabhu, T. P; Rao, S. K; Srinivasan, R; Upadhya, S. S (Springer, 2019-12)
    HAGAR is a system of seven Non-imaging Atmospheric Cherenkov Telescopes located at Hanle in the Ladakh region of the Indian Himalay as at an altitude of 4270 meters amsl . Since 2008, we have observed the Crab Nebula to ...
  • VI CCD photometry of metal-rich globular clusters: NGC 6528 
    Richtler, T; Grebel, E. K; Subramaniam, A; Sagar, R (European Southern Observatory, 1998-01)
    We present CCD photometry in V and I for the metal-rich globular cluster NGC 6528. A comparison with previous photometry reveals discrepancies of the order 0.1 to 0.2 mag in V, emphasizing the need for independent photometry. ...
  • Vibration-rotation bands of SiH and MgH in sunspot spectra 
    Sinha, K; Joshi, G. C (Astronomical Society of India, 1982-12)
    We have calculated the equivalent widths of the vibration-rotation bands of SiH and MgH molecules for a possible detection in the sunspot spectrum. Five different models were utilized and the results obtained with and ...
  • Vibration-rotation spectrum of CIO and its role in the stratosphere 
    Murty, P. S (American Meteorological Society, 1979-10)
    The possible role in the stratosphere of vibrationally excited chlorine monoxide molecules in the ground electronic state is examined. An infrared vibration-rotation emission spectrum of chlorine monoxide is expected to ...
  • Video recording of the flash spectrum during the total solar eclipse October 24, 1995 
    Trivedi, P; Guruprasad, R; Radhakrishnan, R. S (Indian Institute of Astrophysics, Bangalore, 1997)
    Flash spectra were recorded at video rate from Behind, Madhya Pradesh A holographic transmission grating, was used in front of a CCD video camera. Using a. solar Image of 0 5mm diameter, the spectrum on the CCD was recorded ...
  • A viewpoint on moderate size solar telescope 
    Bhatnagar, A (Astronomical Society of India, 1998)
  • Vinnai Thandi Parpoma (Documentary) 
    Doordarshan Kendra, National, Podhigai,Chennai (2009-12-26)
  • Vintage maps in IIA archives 
    Birdie, C; Vagiswari, A (Indian Institute of Astrophysics, 2008-06)
  • The violent hard X-ray variability of MRK 421 observed by Nustar in 2013 April 
    Paliya, Vaidehi S; Bottcher, M; Diltz, C; Stalin, C. S; Sahayanathan, S; Ravikumar, C. D (IOP Publishing, 2015-10-01)
    The well-studied blazar Markarian 421 (Mrk 421, z = 0.031) was the subject of an intensive multi-wavelength campaign when it flared in 2013 April. The recorded X-ray and very high-energy (E > 100 GeV) γ-ray fluxes are the ...
  • Violet absorption edges of C IV lines in Wolf-Rayet spectra: possible superposition with diffuse interstellar bands at 5780 Å and 5797 Å 
    Giridhar, S; Bappu, M. K. V (Indian Institute of Astrophysics, 1978)
    It is shown that the violet edges normally seen in Wolf-Rayet stars around 5800Å are principally due to displaced C IV absorption. The diffuse interstellar bands are seldom of comparable strength and can be seen separately ...
  • Virtual Observatory-India: information support for remote users 
    Vagiswari, Alladi; Birdie, C; Nirupama Bawdekar; Ajit, Khembhavi; Geetha Sheshadri (U.S.Naval Observatory, 2003)
    A Virtual Observatory (VO) seeks to provide a single virtual platform which will provide astronomers easy access to large astronomical data over many different wavelengths. The data are gathered from space-based missions ...
  • Viscous damping of Alfven surface waves in the solar atmosphere 
    Rathinavelu, G. D; Sivaraman, M; Narayanan, A. S (MAIK Nauka, 2009-12)
    The dispersion relation for the propagation of viscous Alfven surface waves along viscous plasma plasma interface has been derived. Two modes of Alfven surface waves are found to propagate with their characteristics depend ...
  • Viscous damping of Alfven surface waves with steady flows 
    Rathinavelu, G. D; Sivaraman, M; Satya Narayanan, A (Springer, 2010)
    The dispersion relation of Alfvén Surface Waves propagating along the moving viscous plasma–vacuum interface has been derived and solved numerically. The plasma layer is below while the upper layer is assumed to be vacuum. ...
  • Viscous damping of Alfvén surface waves at a magnetic interface 
    Rathinavelu, G. D; Sivaraman, M; Satya Narayanan, A (IOP Publishing, 2010-02)
    The dispersion relation for the propagation of viscous Alfvén surface waves along viscous plasma-plasma interface has been derived. Two modes of Alfvén surface waves are found to propagate with their characteristics depend ...
  • 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, ...
  • The visible emission spectrum of diatomic barium iodide 
    Rao, M. L. P; Rao, D. V. K; Rao, P. T; Murty, P. S (1977)
    High resolution spectrograms of the visible emission spectrum of diatomic barium iodide, excited in a radio-frequency discharge source, reveal the presence of two intense sequences of head-less bands in the region 5330-5620Å. ...
  • Visible spectrum of Pi/sup1 Gruis - Identification of new E/sup1 Pi-X/sup1 Sigma/sup+/ and 1 Sigma/sup+ - X/sup1 Sigma/sup+ bands of ZrO 
    Murty, P. S (American Astronomical Society, 1982-09)
    New molecular features identified with the e 1H-X + and ` +-X ` + transitions of ZrO, in the 5840-7210 A spectral region of the S star ` Gru, are presented. The measured band positions are in accord with the laboratory and ...
  • VLA observations of extreme hydrogen deficient stars 
    Kameswara Rao, N; Venugopal, V. R; Patnaik, A (Indian Academy of Sciences, 1985-09)
    Observations at 2 and 6 cm have been obtained for six hydrogen-deficient stars R CrB, HD 160641, BD -9 deg 4395, V 348 Sgr, MV Sgr, and Upsilon Sgr by means of the National Radio Astronomy Observatory's Very Large Array ...
  • VLA observations of solar active regions at 6 and 20 CM 
    Alissandrakis, C. E; Kundu, M. R; Shevgaonkar, R. K (The European Southern Observatory, 1991-11)
    High-resolution observations are presented of two active regions at 6 and 20 cm over a period of 5 days, together with H-alpha and photospheric magnetic fields. The large-scale emission at 20 cm is associated with the ...

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