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Browsing IIAP Publications by Title

Browsing IIAP Publications by Title

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  • Waves in the solar photosphere 
    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, ...
  • Waves in the sunspot penumbra 
    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 ...
  • Weak emission line [WELS] central stars of planetary nebulae are [WC]-PG1159 stars 
    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 ...
  • Weak G-band stars on the H-R diagram: clues to the origin of the Li anomaly 
    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 ...
  • The weakened and obliterated lines in the Sun-spot spectrum 
    Nagaraja, G (American Astronomical Society, 1907-10)
  • The WEBT campaign to observe AO 0235+16 in the 2003-2004 observing season. Results from radio-to-optical monitoring and XMM-Newton observations 
    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 ...
  • Westward ionospheric currents over the dip equator during geomagnetic disturbances 
    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 ...
  • What Can We Learn on the Structure and the Dynamics of the Solar Core with g Modes? 
    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 ...
  • What is Special About the Planck Mass? 
    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 ...
  • What's old and what's new about neutrinos 
    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 ...
  • When does the polar activity cycle start? 
    Makarov, V. I; Tlatov, A. G; Sivaraman, K. R (WILEY-VCH Verlag GmbH & Co., 2003-05)
  • When less is more: Are radio galaxies below the Fanaroff-Riley break more polarized on parsec scales? 
    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 ...
  • When The Sun Goes Out 
    Bappu, M. K. V (Indian Academy of Science, 2002-08)
  • Why are classical bulges more common in S0 galaxies than in spiral galaxies? 
    Mishra, P. K; Wadadekar, Y; Barway, Sudhanshu (Oxford University Press on behalf of the Royal Astronomical Society, 2018-07)
    In this paper, we try to understand why the classical bulge fraction observed in S0 galaxies is significantly higher than that in spiral galaxies. We carry out a comparative study of the bulge and global properties of a ...
  • Why Does the Sun Have Kilogauss Magnetic Fields? 
    Hasan, S. S; van Ballegooijen, A. A (Astronomical Society of the Pacific, 1998)
    Magnetic fields in the solar photosphere are concentrated in flux tubes with kilogauss field strength surrounded by nearly field-free plasma. Observations show that the flux tubes are located in convective downdrafts where ...
  • Why has Uranus toppled over? 
    Kochhar, R. K (Indian Academy of Sciences, 1989-10)
  • Why is geomagnetic activity during the ending years of a solar cycle well correlated to the maximum of the next cycle? 
    Gokhale, M. H (Indian Institute of Astrophysics, 1979-11)
    The two component nature of the solar activity cycle as resulting from the shock-transition model of the solar magnetic cycle, provides for a correlation between a measure of coronal hole formations during the ending years ...
  • Wide-band view of high-frequency quasi-periodic oscillations of GRS 1915+105 in ‘softer’ variability classes observed with AstroSat 
    Majumder, Seshadri; Sreehari, H; Aftab, Nafisa; Katoch, Tilak; Das, Santabrata; Nandi, Anuj (Oxford University Press on behalf of Royal Astronomical Society, 2022-05)
    We present a comprehensive temporal and spectral analysis of the ‘softer’ variability classes (i.e. θ, β, δ, ρ, κ, ω and γ ) of the source GRS 1915+105 observed by AstroSat during the 2016−2021 campaign. Wide-band (3−60 ...
  • Wide-field ultraviolet imager for astronomical transient studies 
    Mathew, J; Ambily, S; Prakash, A; Mayuresh, Sarpotdar; Nirmal, K; Sreejith, A. G; Safonova, M; Murthy, J; Brosch, N (Springer, 2018-04)
    Though the ultraviolet (UV) domain plays a vital role in the studies of astronomical transient events, the UV time-domain sky remains largely unexplored. We have designed a wide-field UV imager that can be flown on a range ...
  • Widened lines in sunspot spectra 
    Smith, C. M (Director Kodaikanal Observatory, 1904-11)

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