IIAP Publications: Recent submissions

  • New identifications of YO and CeO in R Cygni 
    Murty, P. S (Gordon and Beach, Science Publishers, 1982)
    New molecular features due to YO and CeO arc reported present in the spectrum of pure S star R Cyg near minimum light. Of the nearly 60 unidentified features listed in the 4620-6420Å region, 10 with YO and II with CeO are ...
  • Stellar Chromospheres 
    Bappu, M. K. V (1977)
  • Constraints on dynamo action 
    Mangalam, A (Springer Netherlands, 2008)
    We discuss first geometrical constraints on dynamo action. Magnetic field decay is unavoidable under certain conditions of symmetry. These known results are encompassed by a calculation for flows described in terms of a ...
  • Millisecond pulsar emission altitude from relativistic phase shift: PSR J0437-4715 
    Gangadhara, R. T; Thomas, R. M. C (Springer Netherlands, 2008)
    We have analyzed the profile of the millisecond pulsar PSR J0437-4715 at 1440 MHz by fitting the Gaussians to pulse components, and identified its 11 emission components. We propose that they form a emission beam with 5 ...
  • Hybrid viscosity and magnetoviscous instability in hot, collisionless accretion disks 
    Subramanian, P; Becker, P. A; Kafatos, M. (Springer Netherlands, 2008)
    We aim to illustrate the role of hot protons in enhancing the magnetorotational instability (MRI) via the “hybrid” viscosity, which is due to the redirection of protons interacting with static magnetic field perturbations, ...
  • Polarization of coherent curvature radiation in pulsars 
    Thomas, R. M. C; Gangadhara, R. T (Springer Netherlands, 2008)
    We consider the coherent curvature radiation by relativistic plasma in pulsar magnetosphere. The radiation emitted by relativistic particle bunches is beamed in the direction of field line tangents. For the first time, we ...
  • Magnetorotational instability in accretion disks 
    Krishan, V; Mahajan, S. M (Springer Netherlands, 2008)
    Accretion disks are a basic and an ubiquitous construct of nature. We describe their formation, briefly and qualitatively, in diverse astrophysical situations. These systems, though controlled by the gravitational forces, ...
  • Alpha effect in partially ionized plasmas 
    Krishan, V; Gangadhara, R. T (Springer Netherlands, 2008)
    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 ...
  • Power spectra of the fluctuations in the solar wind 
    Krishan, V (Springer Netherlands, 2008)
    The power spectra of the velocity, the magnetic field and the density fluctuations and their inter-relationships are investigated in the turbulent solar wind using the dimensional approach of the Kolmogorovic type. While ...
  • Identification of new CeO features in the S star Pi Gruis 
    Murty, P. S (Gordon and Beach, Science Publishers, 1983)
    Spectrograms in the 6040-7300 A wavelength region of the S star Pi Gruis reveal the presence of new molecular features attributable to CeO. Measures of band heads compared reasonably well with the laboratory spectrum. The ...
  • Nonlinear jeans instability in an uniformly rotating gas 
    Chakrabarti, N; Pal, B; Krishan, V (Springer Netherlands, 2008)
    A nonlinear stability analysis of a uniformly rotating gas in a gravitational field has been performed. One dimensional non-linear equations have been solved by the double-Lagrangian transformation method. An explosive ...
  • Magnetic field generation from Alfven waves propagating along helical lines of force 
    Bera, B; Das, C; Chakraborty, B; Khan, M; Krishan, V; Bhattacharyya, B (Springer, 1992-07)
    A static induced magnetization of Alfven waves (IMAW) due to the inverse Faraday effect is defined and studied. The Alfven waves are assumed to propagate along helical lines of force of a force-free ambient magnetic field. ...
  • Star formation in blue compact dwarf galaxies: Mkn 104 and I Zw 97 
    Ramya, S; Sahu, D. K; Prabhu, T. P (Blackwell Publishing, 2009-06)
    Two blue compact dwarf galaxies, Mkn 104 and I Zw 97, are studied photometrically and spectroscopically. Mkn 104 is found to contain three distinct bright star-forming regions, whereas I Zw 97 is found to contain three ...
  • An atmosphere on Ganymede from its occultation of SAO 186800 on 7 June 1972 
    Carlson, R. W; Bhattacharyya, J. C; Smith, B. A; Johnson, T. V; Hidayat, B; Smith, S. A; Taylor, G. E; O'Leary, B; Brinkmann, R. T (The American Association for the Advancement of Science, 1973-09)
    On 7 June 1972 the third Jovian satellite Ganymede occulted the eighth-magnitude star SAO 186800. Successful photoelectric observations obtained at Lembang, Java (Indonesia), and Kavalur, India, show nonabrupt immersions ...
  • Solar asymmetry and sun-earth connections 
    Georgieva, K; Kirov, B; Javaraiah, J (European Space Agency, 2003-09)
    The effect of solar activity on climate depends on the North-South solar activity asymmetry: the correlation between solar activity and a number of meteorological elements has opposite signs for predominantly more active ...
  • Short-term variations in solar rotation rate and solar wind parameters 
    Georgieva, K; Javaraiah, J; Kirov, B; Atanasov, D (European Space Agency, 2002-12)
    The components of the interplanetary magnetic field (IMF) at the Earth's orbit are described by the model of Parker [1958]. In it, the solar rotation rate is assumed constant. In the present paper we compare in-situ ...
  • Depth dependence of the periodicities in solar differential rotation 
    Javaraiah, J (European Space Agency, 1998-10)
    Earlier, we showed existence of `20 yr' periodicity in the variations of the differential rotation coefficient B determined from Greenwich sunspot group data during 1879-1976 (Javaraiah and Gokhale, 1995). Recently, we ...
  • Solar differential rotation and properties of magnetic clouds 
    Georgieva, K; Kirov, B; Gavruseva, E; Javaraiah, J (European Space Agency, 2005-12)
    The most geoeffective solar drivers are magnetic clouds - a subclass of coronal mass ejections (CME's) distinguished by the smooth rotation of the magnetic field inside the structure. The portion of CME's that are magnetic ...
  • 22-year periodicity in solar rotation, solar wind parameters and earth rotation 
    Kirov, B; Georgieva, K; Javaraiah, J (European Space Agency, 2002-12)
    It is generally accepted that the annual variation in the Earth's rotation rate is fully determined by large-scale seasonal changes in atmospheric circulation, while the decadal changes in Earth's rotation have been shown ...
  • Council report on solar activity in 1939: Prominences 
    Narayan, A. L (Royal Astronomical Society, 1940-02)

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