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Browsing IIAP Publications by Title

Browsing IIAP Publications by Title

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  • Namboodiri, P. M. S (2006-01)
    Galaxies interact in a multitude of ways with their environment. Such interactions can alter the morphological type of galaxies, trigger star formation and even produce active galactic nuclei. During the past three decades ...
  • Golap, K; Issur, N. H; Somanah, R; Dodson, R; Modgekar, M; Sachdev, S; Shankar, N. Udaya; Sastry, Ch. V (Springer Netherlands, 1995-06)
    The Mauritius Radiotelescope (MRT) is a T-shaped array of helical antennas with a 2048 m EW arm and a 890 m South arm. The primary objective of the telescope is to produce a sky survey in the declination zone -15° to -65° ...
  • Sivaram, C; de Sabbata, Venzo (Kluwer Academic Publishers, 1991-02)
    The maximum acceleration at the Planck epoch is shown to be related to the maximum magnetic field and curvature as well as temperature in that era. Spin-torsion effects at that epoch also lead to same value.
  • Shevgaonkar, R. K (European Southern Observatory, 1986-07)
    An application of the Maximum Entropy Method (MEM) to the closure data is described. It is shown that although the basic principle of the method is to obtain a brightness distribution which has highest entropy, the closure ...
  • Shevgaonkar, R. K (European Southern Observatory, 1986-07)
    An application of the Maximum Entropy Method (MEM) to the closure data is described. It is shown that although the basic principle of the method is to obtain a brightness distribution which has highest entropy, the closure ...
  • Shevgaonkar, R. K (The European Southern Observatory, 1987-04)
    A simple maximum entropy method algorithm for deconvolving polarized images obtained from synthesis observations has been described here. A general purpose Fortran program is also developed. it demonstrated that although ...
  • Paradkar, B. S; Chitre, S. M; Krishan, V (Oxford University Press on behalf of the Royal Astronomical Society, 2019-09)
    A non-linear α − Ω dynamo in the partially ionized turbulent plasma in the presence of sub-surface velocity shear is studied with mean-field electrodynamics. Such a dynamo is probably operational in the near-surface region ...
  • Dhar, A; Singh, Manpreet; Rai, R. V; Das, B. P (American Physical Society, 2011-09)
    We analyze the various phases exhibited by a system of ultracold bosons in a periodic optical superlattice using the mean-field decoupling approximation. We investigate for a wide range of commensurate and incommensurate ...
  • Krishan, V; Gangadhara, R. T (Blackwell Publishing, 2008-04)
    There are several astrophysical situations where one needs to study the dynamics of magnetic flux in partially ionized turbulent plasmas. In a partially ionized plasma, the magnetic induction is subjected to the ambipolar ...
  • Shastri, P (Indian Academy of Sciences, 2008)
  • Lal, M; Bose, S; Ghosh, A. B (Indian Institute of Astrophysics, Bangalore, 1997)
    Direct solar irradiance between 1200 and 1700 nm have been measured using ground-based IR spectroradiometer during October 24, 1995, solar eclipse over Delhi (28.7 degree N, 77.2 degree E, 220 MSL), India. The irradiance ...
  • Sridharan, R; Ravindra, B; Prabhu, K (Springer, 2019-01)
    We extend our modified parameter search method (Sridharan, Dashora, and Venkatakrishnan, Solar Phys.222, 35, 2004) of estimating the Fried parameter (r0) from long exposure images to the images obtained from the Hα-telescope ...
  • Priyanka Rani; Stalin, C. S (Indian Academy of Sciences, 2018-02)
    Precise measurement of the coronal properties of Active Galactic Nuclei (AGN) requires the availability of high signal-to-noise ratio data covering a wide range of X-ray energies. The Nuclear Spectroscopic Telescope Array ...
  • Sujatha, N. V; Murthy, J; Shalima, P (University of Chicago Press, 2007-08)
    We have used FUSE and Voyager observations of dust-scattered starlight in the neighborhood of the Coalsack Nebula to derive the optical constants of the dust grains. The albedo is consistent with a value of 0.28 ± 0.04, ...
  • Pandya, T. P; Saxena, A. K (American Institute of Physics, 1979-03)
    A theory for determining one-dimensional ray deflections with the help of distorted Babinet fringes has been developed. An approach for investigating two-dimensional ray deflections has been presented. Applications of the ...
  • Sankarasubramanian, K; Samson, J. P. A; Venkatakrishnan, P (Kluwer Academic Publishers, 1999)
    The measurement of the instrumental polarization for any obliquely reflecting telescope is necessary to measure the polarization state of the input beam precisely. To find out the instrumental polarization of the reflecting ...
  • Howard, R. F; Gupta, S. S; Sivaraman, K. R (Kluwer Academic Publishers, 1999-05)
    Sunspot umbral positions and areas were measured for 82years (1906-1987) of daily, full-disk photoheliogram observations at the Kodaikanal station of the Indian Institute of Astrophysics. The measurement technique and ...
  • Gupta, S. S; Sivaraman, K. R; Howard, R. F (Kluwer Academic Publishers, 1999-09)
    The Kodaikanal sunspot data set covering the interval 1906-1987 is analyzed for differential rotation of sunspots of different sizes. As is known, smaller sunspots rotate faster than larger sunspots, and this result is ...
  • Sivaraman, K. R; Gupta, S. S; Howard, R. F (Kluwer Academic Publishers, 1999-10)
    The Kodaikanal sunspot data set, covering the interval 1906-1987, is used in conjunction with the similar Mount Wilson sunspot data set, covering the interval 1917-1985, to examine characteristics of sunspot group axial ...
  • Sivaraman, K. R; Sivaraman, H; Gupta, S. S; Howard, R. F (Springer, 2003-05)
    We find from an analysis of the Kodaikanal sunspot group data that the rotation rates of spot groups increase with their age when the rotation rates are computed after sorting the spot groups life-span-wise. We confirm ...

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