IIAP Publications: Recent submissions

  • Noise reduction in the centroiding of laser guide star spot pattern using thresholded Zernike reconstructor 
    Vyas, A; Roopashree, M. B; Prasad, B. R (SPIE--The International Society for Optical Engineering., 2010-07)
    Centroiding inaccuracies contribute to most of the wavefront reconstruction error in a Shack Hartmann sensor based adaptive optics system. These errors primarily occur due to the presence of photon noise, readout noise, ...
  • Radio observations of weak energy releases in the solar corona 
    Ramesh, R; Kathiravan, C; Barve, Indrajit V; Beeharry, G. K; Rajasekara, G. N (IOP Science, 2010-08-10)
    We report observations of weak, circularly polarized, structureless type III bursts from the solar corona in the absence of Hα/X-ray flares and other related activity, during the minimum between the sunspot cycles 23 and ...
  • Phase variability of Sq (H) on normal quiet days in the equatorial electrojet region 
    Sastri, J. H (Royal Astronomical Society, 1982-10)
    From a study of ‘abnormal quiet days’ (AQDs) at equatorial latitudes it was found earlier (Sastri) that the occurrence of an abnormal Sq(H) phase confined to the equatorial electrojet belt is closely associated with the ...
  • Physical process at super-high energies 
    Datta, B (Einstein Foundation International, 1983)
  • Two-wave mixing and light-induced absorption dynamics in photorefractive BaTiO3 crystals 
    Banyal, R. K; Prasad, B. R (Indian Institute of Science, 2003-08)
    Steady-state and temporal measurements of TWM and LIA have been carried out in PR BaTiO3 crystals at different wavelengths and intensities of laser light. The observed behavior is interpreted in terms of two-center charge ...
  • Alfred Wegener –From Continental Drift to Plate Tectonics 
    Saigeetha, A. J; Banyal, R. K (Indian Academy of Sciences, 2005-06)
  • A new probable Be Star Alpha Leo 
    Singh, M (Konkoly Observatory, 1982-08-16)
  • Magnetic transport on the solar atmosphere by turbulent ambipolar diffusion 
    Krishan, V; Masuda, S (Anita Publications, 2008-12)
    The lower solar atmosphere consists of partially ionized turbulent plasmas harboring velocity field, magnetic field and current density fluctuations. The correlations amongst these small scale fluctuations give rise to ...
  • The hydrogen-deficient irregular variable star V348 SGR 
    Kameswara Rao, N; Nandy, K (1984-07)
    The distribution of the reddening material around V 348 Sgr was studied using the IUE low resolution spectra. The nebula surrounding the star has a reddening of E(B-V) = 0.3 caused mainly by the foreground interstellar ...
  • Rotation and H-alpha emission activity in F8-G3 dwarfs 
    Mekkaden, M. V (Kluwer Academic Publishers, 1985-12)
    The dependence of H-alpha emission strength on rotational period and spectral type in late-type stars is studied using published data. The emission strength shows strong correlation with rotation irrespective of age and ...
  • Evolution of coronal helicity in a twisted emerging active region 
    Ravindra, B; Longcope, D. W (Springer, 2010)
    Active-region magnetic fields are believed to be generated near the shear layer of the convection zone by dynamo processes. These magnetic fields are concentrated into fluxtubes, which rise, due to buoyancy, through the ...
  • Long-term variations in meridional flows 
    Javaraiah, J (Springer, 2010)
    Using sunspot group data from Greenwich and from the Solar Optical Observation Network during 1879–2008, we find that the mean meridional motion of the observed spot groups varies considerably on a time scale of about 10–20 ...
  • Low-frequency radio observations of coronal magnetic fields 
    Ramesh, R; Sonnett, S. M; Kathiravan, C (Springer, 2010)
    We report observations of circularly polarized noise storm emission from the solar corona at 77 and 109MHz during the period 11–18 August 2006 (Carrington Rotation 2046) with the recently commissioned East-West one-dimensional ...
  • Waves in polar coronal holes 
    Banerjee, D (Springer, 2010)
    The fast solar wind originates from polar coronal holes. Recent observations from SoHO suggest that the solar wind is flowing from funnel-shaped magnetic fields anchored in the lanes of the magnetic network at the solar ...
  • Stability of cool flux tubes in the solar chromosphere Linear analysis 
    Hasan, S. S; Kneer, F (EDP Sciences, 1986-04)
    The linear stability of cool flux tubes in the solar chromosphere which are initially in radiative equilibrium is examined. Owing to the presence of carbon monoxide, there exists a narrow region near the temperature minimum ...
  • Equilibrium structure of solar magnetic flux tubes: Energy transport with multistream radiative transfer 
    Hasan, S. S; Kalkofen, W (The American Astronomical Society, 1994-11)
    We examine the equilibrium structure of vertical intense magnetic flux tubes on the Sun. Assuming cylindrical geometry, we solve the magnetohydrostatic equations in the thin flux-tube approximation, allowing for energy ...
  • Mode classification and wave propagation in a magnetically structured medium 
    Hasan, S. S; Sobouti, Y (Blackwell, 1987-09)
    The authors examine the structure of motions that can occur in a vertical magnetic flux tube with a rectangular cross-section. A polytropic stratification is assumed in the vertical direction. The authors use a gauged ...
  • NLST: India's National Large Solar Telescope 
    Hasan, S. S; Soltau, D; Kärcher, H; Süß, M; Berkefeld, T (Wiley-Blackwell, 2010-06)
    This article introduces the new Indian 2 m telescope which has been designed by MT Mechatronics in a detailed conceptual design study for the Indian Institute of Astrophysics, Bangalore. We describe the background of the ...
  • Republication of: radial movement in sunspots 
    Hasan, S. S (Springer, 2010)
    Displacements of the lines of hydrogen and calcium in the neighbourhood of sunspots, indicating violent motions in the line of sight, is a common characteristic of spot disturbances. Such phenomena are frequently observed ...
  • Spectropolarimetry with the NLST 
    Sankarasubramanian, K; Hasan, S. S; Rangarajan, K. E (Springer, 2010)
    India’s National Large Solar Telescope (NLST) will provide opportunities to observe the Sun with high spatial, spectral, and polarimetric resolution. The large aperture also enables high-cadence spectropolarimetry with ...

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