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Browsing IIAP Publications by Title

Browsing IIAP Publications by Title

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  • Solar-Cycle Characteristics in Kodaikanal Sunspot Area: North-South Asymmetry, Phase Distribution and Gnevyshev Gap 
    Ravindra, B; Chowdhury, Partha; Javaraiah, J (Springer Nature, 2021-01)
    Solar activity is asymmetric in the two hemispheres in almost all cycles. This asymmetry is observed both in cycle amplitude and period. We have used about 90 years of sunspot-area data from the Kodaikanal Solar Observatory ...
  • Solar-Cycle-Related Variations in the Solar Differential Rotation and Meridional Flow: A Comparison 
    Javaraiah, J; Ulrich, R. K (Springer, 2006-09)
    We have analysed a large set of sunspot group data (1874 2004) and find that the meridional flow strongly varies with the phase of the solar cycle, and the variation is quite different in the northern and the southern ...
  • Solar-like oscillations in HD 181420: data analysis of 156 days of CoRoT data 
    Barban, C; Deheuvels, S; Baudin, F; Appourchaux, T; Auvergne, M; Ballot, J; Boumier, P; Chaplin, W. J; Garcia, R. A; Gaulme, P; Michel, E; Mosser, B; Regulo, C; Roxburgh, I. W; Verner, G; Baglin, A; Catala, C; Samadi, R; Bruntt, H; Elsworth, Y; Mathur, S (EDP Sciences, 2009-10)
    Context. The estimate of solar-like oscillation properties, such as their frequencies, amplitudes and lifetimes, is challenging because of their low amplitudes and will benefit from long and uninterrupted observing runs. ...
  • Solar-like oscillations in low-luminosity red giants: first results from Kepler 
    Bedding, T. R; Huber, D; Stello, D; Elsworth, Y. P; Hekker, S; Kallinger, T; Mathur, S; Mosser, B; Preston, H. L; Ballot, J; Barban, C; Broomhall, A. M; Buzasi, D. L; Chaplin, W. J; Garcia, R. A; Gruberbauer, M; Hale, S. J; De Ridder, J; Frandsen, S; Borucki, W. J; Brown, T; Christensen-Dalsgaard, J; Gilliland, R. L; Jenkins, J. M; Kjeldsen, H; Koch, D; Belkacem, K; Bildsten, L; Bruntt, H; Campante, T. L; Deheuvels, S; Derekas, A; Dupret, M. A; Goupil, M. J; Hatzes, A; Houdek, G; Ireland, M. J; Jiang, C; Karoff, C; Kiss, L. L; Lebreton, Y; Miglio, A; Montalban, J; Noels, A; Roxburgh, I. W; Sangaralingam, V; Stevens, I. R; Suran, M. D; Tarrant, N. J; Weiss, A (IOP Publishing, 2010-04)
    We have measured solar-like oscillations in red giants using time-series photometry from the first 34 days of science operations of the Kepler Mission. The light curves, obtained with 30-minute sampling, reveal clear ...
  • Solar-like oscillations with low amplitude in the CoRoT target HD 181906 
    Garcia, R. A; Regulo, C; Samadi, R; Ballot, J; Barban, C; Benomar, O; Chaplin, W. J; Gaulme, P; Appourchaux, T; Mathur, S; Mosser, B; Toutain, T; Verner, G. A; Auvergne, M; Baglin, A; Baudin, F; Boumier, P; Bruntt, H; Catala, C; Deheuvels, S; Elsworth, Y; Jimenez-Reyes, S. J; Michel, E; Perez Hernandez, F; Roxburgh, I. W; Salabert, D (EDP Sciences, 2009-10)
    Context: The F8 star HD 181906 (effective temperature ~6300K) was observed for 156 days by the CoRoT satellite during the first long run in the centre direction. Analysis of the data reveals a spectrum of solar-like acoustic ...
  • The solar-neutrino problem 
    de Sabbata, V; Sivaram, C (Springer, 1991-10)
    The problem of solar neutrinos is discussed in the case of a large magnetic field in the innermost region of the core (<0.05 R/sub/ sun) and of neutrinos with magnetic moment. Some predictions are made as regards experiments ...
  • SoLEXS - A low energy X-ray spectrometer for solar coronal studies 
    Sankarasubramanian, K; Ramadevi, M. C; Bug, M; Umapath, C. N; Seetha, S; Sreekumar, P; Kumar (Astronomical Society of India, 2011)
    A Solar Low-energy X-ray Spectrometer (SoLEXS), a high spectral resolution (≤ 250 eV at 5.9 keV) instrument with soft X-ray energy coverage (≤ 1.5 keV), is being proposed as an additional payload on-board Aditya-1. The ...
  • Solution of radiative transfer equation in spherically symmetric media with spherical harmonic approximation 
    Peraiah, A (Indian Institute of Astrophysics, 1979-11)
    A numerical method for obtaining solution of radiative transfer equation in spherically symmetric media with spherical harmonic approximation is presented. The angle derivative is approximated by an orthonormal polynomial ...
  • Solution of radiative transfer equation with spherical-symmetry in partially scattering medium 
    Peraiah, A; Varghese, B. A (D. Reidel Publishing Co., 1985-01)
    The authors have solved the equation of radiative transfer in spherical symmetry with scattering and absorbing medium. They have set the albedo for single scattering to be equal to 0.5. They have set the Planck function ...
  • Some aspects of MOND and its consequences for cosmology 
    Sivaram, C (Springer, 1994-05)
    Some consequences of MOND (Modification of Newtonian dynamics) proposed as an alternative hypothesis to dark matter for various astrophysical situations is discussed. The ubiquitous occurrence of the fundamental acceleration ...
  • Some aspects of polarized line formation in magneto-turbulent media 
    Sampoorna, M; Frisch, H; Nagendra, K. N (Elsevier B. V., 2008-05)
    Observations and numerical simulations of magneto-convection show a highly variable solar magnetic field. Using a statistical approach, we analyze the effects of random magnetic fields on Stokes profiles of spectral lines. ...
  • Some Aspects of Rayleigh and Mie Scattering in the Atmosphere Over Pune 
    Devara, P. C. S; Raj, P. E (Indian Institute of Astrophysics, Bangalore, 1991)
    Computations of aerosol mixing ratio [( Na + Nm)/Nm] have been made using the aerosol number density (Na) estimated from the laser radar (lidar) observations carried out at the IITM, Pune and air molecular number density ...
  • Some aspects of rotational and magnetic energies for a hierarchy of celestial objects 
    Sivaram, C; Arun, K (Springer, 2012-02)
    Celestial objects, from earth like planets to clusters of galaxies, possess angular momentum and magnetic fields. Here we compare the rotational and magnetic energies of a whole range of these celestial objects together ...
  • Some aspects of the solution of vector transfer equation in a magnetized medium 
    Nagendra, K. N; Peraiah, A (Kluwer Academic Publishers, 1985-12)
    A simplification of the numerical method of solving the vector transfer equation, given earlier by Nagendra and Peraiah (1985), is described for problems which involve only absorption. This makes it possible to attempt to ...
  • Some characteristics of sunspot activity within a cycle 
    Ramanathan, A. S; Natarajan, V (The Observatory, 1965-10)
  • Some comments on the two prism tunnelling experiment 
    Unnikrishnan, C. S; Murthy, S. A (Elsevier B.V, 1996-09)
    We show that the two prism tunnelling experiment of Mizobuchi and Ohtake [Phys. Lett. A 168 (1992) 1] does not verify the quantum optical prediction due to insufficient statistical precision in the anticoincidence measurement. ...
  • Some Consequences of a Universal Tension Arising from Dark Energy for Structures from Atomic Nuclei to Galaxy Clusters 
    Sivaram, C; Arun, K; Kiren, O. V (Bentham Open, 2013-11-29)
    In recent work, a new cosmological paradigm implied a mass-radius relation, suggesting a universal tension related to the background dark energy (cosmological constant), leading to an energy per unit area that holds for ...
  • Some consequences of mond 
    Sivaram, C (World Scientific, 1995)
  • Some consequences of quadratic gravity for the early universe 
    Sivaram, C; Campanelli, M (Springer Netherlands, 1992-06)
    The hypothesis that gravity at very high energies and, hence, around the Planck epoch in the early universe is described by an action quadratic in the curvature, asymptotically free in the coupling is explored. It is shown ...
  • Some constraints on quasar progenitors and quasar evolution 
    Sivaram, C (International Astronomical Union, 1986)

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