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Browsing IIAP Publications by Title

Browsing IIAP Publications by Title

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  • Vigeesh, G; Hasan, S. S; Steiner, O (European Southern Observatory, 2009-12)
    Aims. We investigate wave propagation and energy transport in magnetic elements, which are representatives of small scale magnetic flux concentrations in the magnetic network on the Sun. This is a continuation of earlier ...
  • Hasan, S. S; van Ballegooijen, A; Steiner, O (Cambridge University Press, 2008-05)
    This investigation is a continuation of earlier work on the dynamics of the magnetic network. In a previous calculation (Hasan et al. 2005), we examined the response of a single flux tube to transverse motions of its ...
  • Hasan, S. S (International Astronomical Union, 1990)
    Wave propagation in sunspot umbrae is analyzed; the stratification in a typical umbra is approximated by a model atmosphere, extending vertically from a depth of a few thousand kilometers below the photosphere, to the ...
  • Hasan, S. S; Vigeesh, G; van Ballegooijen, A. A (Cambridge University Press, 2006)
    Hasan et al. (2005) have recently presented 2-D dynamical calculations on wave propagation in in the magnetic network of the Sun. The latter is idealized as consisting of non-potential flux tubes in the quiet solar ...
  • Saxena, A. K; Lancelot, J. P (SPIE-The International Society for Optical Engineering, 1990)
    The use of crossed Babinet Compensator (B. C.) combination as simple and effective device for wavefront sensing and evaluation has been described. This method can be utilized for on line evaluation of the wavefront or the ...
  • Nirmal, K; Sridharan, R; Sriram, S; Ambily, S; Mathew, J; Mayuresh, Sarpotdar; Murthy, J; Binukumar, G; Safonova, M (SPIE-The International Society for Optical Engineering, 2018-07-06)
    Spatial Heterodyne Spectroscopy (SHS) is a relatively novel interferometric technique similar to Fourier transform spectroscopy and shares design similarities with a Michelson Interferometer. An Imaging detector is used ...
  • 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 ...
  • Pandey, B. P; Vranjes, J; Krishan, V (Blackwell Synergy, 2008-05)
    The solar photosphere is a partially ionized medium with collisions between electrons, various metallic ions and neutral hydrogen playing an important role in the momentum and energy transport in the medium. Furthermore, ...
  • Antia, H. M; Chitre, S. M; Gokhale, M. H (Springer, 1978-11)
    Sunspot theory is discussed with reference to the role played by the spot magnetic field in influencing the mode of energy transport. Consideration is given to the stability of a plane parallel polytropic fluid layer with ...
  • Parthasarathy, M; Acker, A; Stenholm, B (European Southern Observatory, 1998-01)
    The characteristics of the spectra of weak emission line stars (WELS) are found to be very similar to that of [WC]-PG1159 and PG1159 objects. On the basis of the spectra we find 31 WELS central stars of planetary nebulae ...
  • Palacios, A; Parthasarathy, M; Bharat Kumar, Y; Jasniewicz, G (EDP Sciences, 2012-02)
    Aims. Weak G-band (WGB) stars are a rare class of cool luminous stars that present a strong depletion in carbon, but also lithium abundance anomalies that have been little explored in the literature since the first discovery ...
  • Nagaraja, G (American Astronomical Society, 1907-10)
  • Raiteri, C. M; Villata, M; Ibrahimov, M. A; Larionov, V. M; Kadler, M; Aller, H. D; Aller, M. F; Kovalev, Y. Y; Lanteri, L; Nilsson, K; Papadakis, I. E; Pursimo, T; Romero, G. E; Teräsranta, H; Tornikoski, M; Arkharov, A. A; Barnaby, D; Berdyugin, A; Böttcher, M; Byckling, K; Carini, M. T; Carosati, D; Cellone, S. A; Ciprini, S; Combi, J. A; Crapanzano, S; Crowe, R; di Paola, A; Dolci, M; Fuhrmann, L; Gu, M; Hagen-Thorn, V. A; Hakala, P; Impellizzeri, V; Jorstad, S; Kerp, J; Kimeridze, G. N; Kovalev, Yu. A; Kraus, A; Krichbaum, T. P; Kurtanidze, O. M; Lähteenmäki, A; Lindfors, E; Mingaliev, M. G; Nesci, R; Nikolashvili, M. G; Ohlert, J; Orio, M; Ostorero, L; Pasanen, M; Pati, A. K; Poteet, C; Ros, E; Ros, J. A; Shastri, P; Sigua, L. A; Sillanpää, A; Smith, N; Takalo, L. O; Tosti, G.; Vasileva, A; Wagner, S. J; Walters, R; Webb, J. R; Wills, W; Witzel, A; Xilouris, E (EDP Sciences, 2005-07)
    A multiwavelength campaign to observe the BL Lac object AO 0235+16 (z=0.94) was set up by the Whole Earth Blazar Telescope (WEBT) collaboration during the observing seasons 2003-2004 and 2004-2005, involving radio, near-IR ...
  • Rastogi, R. G (The American Geophysical Union, 1975-04)
    During geomagnetic disturbed periods, the q type of sporadic E layer near the dip equator is shown to disappear with maximum error of five minutes during the period when the difference of the geomagnetic H field between ...
  • Mathur, S; Eff-Darwich, A; García, R. A; Jimenez-Reyes, S. J; Korzennik, S. G; Turck-Chieze, S (Astronomical Society of the Pacific, 2009-12)
    The detection of the signature of dipole gravity modes has opened the path to study the solar inner radiative zone. Indeed, g modes should be the best probes to infer the properties of the solar nuclear core that represents ...
  • Sivaram, C (South Asian Publishers Pvt Ltd, 2008-06)
    Planck introduced his famous units of mass, length and time a hundred years ago. The many interesting facets of the Planck mass and length are explored. The Planck mass ubiquitously occurs in astrophysics, cosmology, quantum ...
  • Cowsik, R (Indian Academy of Sciences, 1998-09-25)
    To save the laws of conservation of energy, linear and angular momentum, Pauli suggested the possible existence of an elementary particle possessing ito electric charge and very little mass called the neutrino, which was ...
  • Makarov, V. I; Tlatov, A. G; Sivaraman, K. R (WILEY-VCH Verlag GmbH & Co., 2003-05)
  • Kharb, P; Shastri, P; Gabuzda, D. C (IOP Publishing, 2005-10-20)
    We present images showing the first detections of polarizations on parsec scales in the nuclei of four Fanaroof-Riley type I (low-luminosity) radio galaxies. Observations with Very long Baseline Interferomatry at lamda 3.6 ...
  • Bappu, M. K. V (Indian Academy of Science, 2002-08)

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