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Browsing IIAP Publications by Title

Browsing IIAP Publications by Title

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  • FPGA Based ASM implementation for CCD Camera Controller 
    Srinivasan, R; Anupama, K; Suneeta; Saha, S. K; Rao, A (MacMillan Publishers Ind. Ltd, 2009)
    A general purpose CCD controller that can address any CCD, has been developed at the Indian Institute of Astrophysics. It is based on a Digital Signal Processor (DSP) chip, Motorola DSP 56002 for implementing essential ...
  • FR Cnc revisited: photometry, polarimetry and spectroscopy 
    Golovin, A; Galvez-Ortiz, M. C; Hernan-Obispo, M; Andreev, M; Barnes, J. R; Montes, D; Pavlenko, E; Pandey, J. C; Martinez-Arnaiz, R; Medhi, B. J; Parihar, P. S; Henden, A; Sergeev, A; Zaitsev, S. V; Karpov, N (Wiley-Blackwell, 2012-03)
    This paper is part of a multiwavelength study aimed at using complementary photometric, polarimetric and spectroscopic data to achieve an understanding of the activity process in late-type stars. Here, we present the ...
  • Fractal structure of solar supergranulation 
    Paniveni, U; Krishan, V; Singh, J; Srikanth, R (European Space Agency, 2005-12)
    We employ fractal analysis to study the complexity of supergranulation structure using the solar and Heliospheric Observatory (SOHO) dopplergrams. Our data consist of 200 visually selected Supergranular cells, for which ...
  • Fraction of broad absorption line quasars in different radio morphologies 
    Nair, A; Vivek, M (Oxford University Press on behalf of Royal Astronomical Society, 2022-04)
    In this study, we investigated the orientation model of Broad Absorption Line (BAL) quasars using a sample of sources that are common in Sloan Digital Sky Survey (SDSS) Data Release (DR)-16 quasar catalogue and Very Large ...
  • Franck-Condon factors and /r-centroids for a number of band systems of the astrophysical molecule AlF 
    Kumar, K. B; Rajamanickam, N; Bagare, S. P; Gomez, F. M; Gonzalez, L. J. J. (Elsevier, 2003-10)
    Franck-Condon factors and /r-centroids, which are very closely related to transition probabilities, have been evaluated by the more reliable numerical integration procedure for the bands of B1Σ+-X1Σ+, C1Σ+-X1Σ+, c3Σ+-b3Σ+, ...
  • Franck-Condon factors and r-centroids for certain band systems of astrophysical molecules SrF and ScF 
    Ramachandran, P. S; Rajamanickam, N; Bagare, S. P; Kumar, B. C (Springer, 2005-01)
    The Franck-Condon factors and r-centroids, which are very closely related to vibrational transition probabilities, have been evaluated by the more reliable numerical integration procedure for the bands of B 2∑+ X 2∑+, F ...
  • French astronomers in India during the 17th - 19th centuries 
    Kochhar, R. K (British Astronomical Society, 1991-04)
    The contributions made by French astronomers from India are reviewed. The French were more successful on the scientific front than on the colonial. The first telescopic discovery from India was made by a French Jesuit ...
  • Frenet-Serret description of gyroscopic precession 
    Iyer, B. R; Vishveshwara, C. V (The American Physical Society, 1993)
    The phenomenon of gyroscopic precession is studied within the framework of the Frenet-Serret formalism adapted to quasi-Killing trajectories. Its relation to the congruence vorticity is highlighted with particular reference ...
  • Frequency and time profiles of metric wave isolated Type I solar noise storm bursts at high spectral and temporal resolution 
    Sundaram, G. A. S; Subramanian, K. R (Royal Astronomical Society, 2005-05)
    Type I noise storms constitute a sizeable fraction of the active Solar radio emission component. Observations of isolated instances of such bursts, in the swept-frequency mode at metric wavelengths, have remained sparse, ...
  • The frequency drift and time splitting of decameter solar radio bursts 
    Sastry, Ch. V (Gordon and Breach, Science Publishers Ltd., 1972-05)
    The frequency drift and time splitting of solar radio bursts are observed with a multi-channel radiometer and a polarimeter at frequencies around 25 MHz. It is found that a majority of noise storm bursts have drift ...
  • Frequency response of magnetic flux sheaths 
    Venkatakrishnan, P (D. Reidel Publishing Co., 1979-08)
    When a sound wave is incident on a magnetic flux sheath, it causes fluctuations in the mean magnetic field of the sheath. We have calculated the space-average of the longitudinal component of these fluctuations and plotted ...
  • Frequency shifts and line broadening of radiation from rotating neutron stars 
    Kapoor, R. C; Datta, B (The Royal Astronomical Society, 1984-08)
    The frequency shifts and line broadening of radiation from the surface of rapidly rotating neutron stars are calculated using a rotationally perturbed interior spherical metric and a representative choice of the equation ...
  • Frequency-dependent core shifts and parameter estimation for the blazar 3C 454.3 
    Mohan, Prashanth; Agarwal, A; Mangalam, A; Gupta, A. C; Wiita, P. J; Volvach, A. E; Aller, M. F; Aller, H. D; Gu, M. F; Lahteenmaki, A; Tornikoski, M; Volvach, L. N (Oxford University Press on behalf of the Royal Astronomical Society, 2015-09-11)
    We study the core shift effect in the parsec-scale jet of the blazar 3C 454.3 using the 4.8– 36.8 GHz radio light curves obtained from three decades of continuous monitoring. From a piecewise Gaussian fit to each flare, ...
  • Frequency-Dependent Damping in Propagating Slow Magneto-Acoustic Waves 
    Krishna Prasad, S; Banerjee, D; Doorsselaere, T. V (IOP Publishing, 2014-07-10)
    Propagating slow magneto-acoustic waves are often observed in polar plumes and active region fan loops. The observed periodicities of these waves range from a few minutes to a few tens of minutes and their amplitudes were ...
  • Frequency-Dependent Lg Attenuation in the Indian Platform 
    Mitra, S; Priestley, K; Gaur, V. K; Rai, S. S (Seismological Society of America, 2006-12)
    We use seismograms from regional earthquakes recorded on digital seismographs in peninsular India to determine the frequency-dependent Q of Lg for the Indian platform. We measure Lg attenuation by determining the decay of ...
  • A fresh look at the seismic spectrum of HD49933: analysis of 180 days of CoRoT photometry 
    Benomar, O; Baudin, F; Campante, T. L; Chaplin, W. J; García, R. A; Gaulme, P; Toutain, T; Verner, G. A; Appourchaux, T; Ballot, J; Barban, C; Elsworth, Y; Mathur, S; Mosser, B; Régulo, C; Roxburgh, I. W; Auvergne, M; Baglin, A; Catala, C; Michel, E; Samadi, R (EDP Sciences, 2009-11)
    Context. Solar-like oscillations have now been observed in several stars, thanks to ground-based spectroscopic observations and space-borne photometry. CoRoT, which has been in orbit since December 2006, has observed the ...
  • From maximum force to the field equations of general relativity and implications 
    Kenath, Arun; Schiller, Christoph; Sivaram, C (World Scientific Publishing, 2022-10-15)
    There are at least two ways to deduce Einstein’s field equations from the principle of maximum force c4/4G or from the equivalent principle of maximum power c5/4G . Tests in gravitational wave astronomy, cosmology, and ...
  • From nearby low luminosity AGN to High Redshift Radio Galaxies: science interests with square kilometre array 
    Kharb, P; Lal, D. V; Singh, V; Bagchi, J; Ishwara-Chandra, C. H; Hota, A; Konar, C; Wadadekar, Yogesh; Shastri, P; Mousumi Das; Baliyan, K; Nath, B. B; M. Pandey-Pommier (Springer, 2016-12)
    We present detailed science cases that a large fraction of the Indian AGN community is interested in pursuing with the upcoming Square Kilometre Array (SKA). These interests range from understanding low luminosity active ...
  • From the margins to the mainstream: Nobel celebrates exoplanets! 
    Puravankara, Manoj; Banyal, R. K; Narang, Mayank (Indian Physics Association, 2019-12)
    This year’s Physics Nobel Prize was jointly awarded to three scientists. Phillip James Peebles from Princeton University, USA, received one half of the prize for his seminal work on physical cosmology, and other half was ...
  • Full non-LTE spectral line formation II. Two-distribution radiation transfer with coherent scattering in the atom’s frame 
    Paletou, F; Sampoorna, M; Peymirat, C (EDP Sciences, 2023-03)
    In this article we discuss a method for obtaining a numerical solution to the so-called full nonlocal thermodynamic equilibrium (nonLTE) radiation transfer problem. More specifically, the usual numerical iterative methods ...

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