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Browsing IIAP Publications by Title

Browsing IIAP Publications by Title

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  • Modeling Dust Jets And Shells From Comet Hale-Bopp 
    Vasundhara, R; Chakraborty, P; Hänel, A; Heiser, E (Kluwer Academic Publishers, 1997-07)
    Persistent jet and shell structures from comet Hale-Bopp showing gradual changes in the shapes and orientations with aspect angle and solar illumination geometry indicate long lived active sources. A model to simulate the ...
  • Modeling of Jets from Comet Hale-Bopp (C/1995 O1): Observations from the Vainu Bappu Observatory 
    Vasundhara, R; Chakraborty, P (Academic Press, 1999-07)
    Jet and shell structures from Comet Hale-Bopp during the period October 1996 to October 1997 using data from the Vainu Bappu Observatory are modeled. Evolution of jet and shell structures during the period of observations ...
  • Modeling of polarization of radio pulsars 
    Gangadhara, R. T (Astronomical Society of the Pacific, 2009-09)
    We have generalized the coherent curvature radiation model to include the detailed geometry of the emission region in pulsar magnetosphere, and deduced the polarization state in terms the Stokes parameters. By considering ...
  • Modeling of short scale turbulence in the solar wind 
    Krishan, V; Mahajan, S. M (European Geosciences Union, 2005-01)
    The solar wind serves as a laboratory for investigating magnetohydrodynamic turbulence under conditions irreproducible on the terra firma. Here we show that the frame work of Hall magnetohydrodynamics (HMHD), which can ...
  • Modeling Repeatedly Flaring δ Sunspots 
    Chatterjee, Piyali; Hansteen, V; Carlsson, M (The American Physical Society, 2016-03)
    Active regions (ARs) appearing on the surface of the Sun are classified into α , β , γ , and δ by the rules of the Mount Wilson Observatory, California on the basis of their topological complexity. Amongst these, the δ ...
  • Modeling the Quantum Interference Signatures of the Ba II D2 4554 Å Line in the Second Solar spectrum 
    Smitha, H. N; Nagendra, K. N; Stenflo, J. O; Sampoorna, M (IOP Publishing, 2013-05-10)
    Quantum interference effects play a vital role in shaping the linear polarization profiles of solar spectral lines. The Ba II D2 line at 4554 Å is a prominent example, where the F-state interference effects due to the odd ...
  • Modeling the Subsurface Structure of Sunspots 
    Moradi, H; Baldner, C; Birch, A. C; Braun, D. C; Cameron, R. H; Duvall, T. L; Gizon, L; Haber, D; Hanasoge, S. M; Hindman, B. W; Jackiewicz, J; Khomenko, E; Komm, R; Rajaguru, S. P; Rempel, M; Roth, M; Schlichenmaier, R; Schunker, H; Spruit, H. C; Strassmeier, K. G; Thompson, M. J; Zharkov, S (Springer, 2010-11)
    While sunspots are easily observed at the solar surface, determining their subsurface structure is not trivial. There are two main hypotheses for the subsurface structure of sunspots: the monolithic model and the cluster ...
  • Modeling the Survival of Population III Stars to the Present Day 
    Dutta, Jayanta; Sur, Sharanya; Stacy, Athena; Bagla, Jasjeet Singh (IOP Publishing, 2020-09-20)
    Recent numerical simulations have suggested the probability of a fraction of the primordial stars being ejected from the cluster of their origin. We explore the possibility that some of these can remain on the main sequence ...
  • Modeling Uranian mutual event light curves 
    Vasundhara, R (Elsevier, 2008-11)
    Salient features of the analysis of the mutual event light curves of planetary satellites are presented. The need to carefully evaluate the flux contribution of the occulting/eclipsing satellite to the total flux is ...
  • Modelling dark matter halo spin using observations and simulations: application to UGC 5288 
    Ansar, Sioree; Kataria, Sandeep Kumar; Mousumi Das (Oxford University Press on behalf of Royal Astronomical Society, 2023-06)
    Dark matter (DM) halo properties are extensively studied in cosmological simulations but are very challenging to estimate from observations. The DM halo density profile of observed galaxies is modelled using multiple ...
  • Modelling dust scattering in our galaxy 
    Murthy, J (Oxford University Press on behalf of the Royal Astronomical Society, 2016-06)
    I have used Monte Carlo models with multiple scattering to predict the dust scattered light from our Galaxy and have compared the predictions with data in two ultraviolet bands from the Galaxy Evolution Explorer spacecraft. ...
  • Modelling high resolution Echelle spectrographs for calibrations: Hanle Echelle spectrograph, a case study 
    Anantha, Ch; Jones, D; Sivarani, T (Springer, 2015-06)
    We present a modelling scheme that predicts the centroids of spectral line features for a high resolution Echelle spectrograph to a high accuracy. Towards this, a computing scheme is used, whereby any astronomical spectrograph ...
  • Modelling of a solar coronal loop 
    Krishan, V (Cambridge University Press, 1996-12)
    Montgomery and co-workers have developed a framework to describe the steady state of a turbulent magnetofluid, without the usual recourse to linearization. Thus the magnetic and velocity fields emerge in their fully nonlinear ...
  • Modelling of dust scattering toward the Coalsack 
    Shalima, P; Murthy, J (Royal Astronomical Society, 2004-08)
    Murthy, Henry & Holberg discovered intense far-ultraviolet (FUV) (λλ912-1600) emission from the direction of the Coalsack molecular cloud 10 years ago. We have used their results in conjunction with a Monte Carlo model for ...
  • Modelling of Plasma Structures in the Solar Atmosphere 
    Krishan, V (Indian Institute of Astrophysics, Bangalore, 1984)
    A maximal helicity principle is proposed to study the stability of plasma structures in the solar atmosphere. This principle derives from the statistical treatment of the magnetohydrodynamical turbulence. The steady state ...
  • Modelling of Solar Coronal Oscillations 
    Krishan, V (Indian Institute of Astrophysics, Bangalore, 1997)
    The study of coronal osciallations is important since these oscillations could be responsible for the heating of the solar corona. Coronal structures are ex[ected to undergo three types of oscillations - non-compressional ...
  • Modelling the diffuse ultraviolet radiation observed by Dynamics Explorer 1 
    Shalima, P; Murthy, J; Fix, J. D (Wiley Blackwell, 2010-10)
    The Dynamics Explorer spacecraft, DE-1, has undertaken two sky surveys in the far-ultraviolet regime, covering a wide variety of Galactic latitudes. We have used a single scattering dust model to probe into the optical ...
  • Modelling the synchrotron light curves in recurrent novae V745 Scorpii and RS Ophiuchi 
    Kantharia, N. G; Dutta, P; Roy, N; Anupama, G. C; Chitale, A; Ishwara-Chandra, C; Prabhu, T. P; Ashok, N. M; Banerjee, D. P. K (Astronomical Society of India, 2015-02)
    In this paper, we present the synchrotron light curve at 610 MHz from the recurrent nova V745 Sco following its outburst on 6 February 2014. The system has been detected and periodically monitored with the Giant Metrewave ...
  • Models of Flux Tubes from Constrained Relaxation 
    Mangalam, A; Krishan, V (Indian Academy of Sciences, 2000-12)
    We study the relaxation of a compressible plasma to an equilibrium with flow. The constraints of conservation of mass, energy, angular momentum, cross-helicity and relative magnetic helicity are imposed. Equilibria ...
  • Models of force-free spheres and applications to solar active regions 
    Avijeet Prasad; Mangalam, A (Astronomical Society of India, 2013)
    Here we present a systematic study of force-free field equation for simple axisymmetric configurations in spherical geometry. The condition of separability of solutions in radial and angular variables leads to two classes ...

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