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Browsing IIAP Publications by Title

Browsing IIAP Publications by Title

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  • 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 ...
  • Models of highly extended dust shells around R Coronae Borealis 
    Nagendra, K. N; Leung, C. M (Royal Astronomical Society, 1996-08)
    Radiation transport models are constructed for the dust shells of the hydrogen deficient supergiant star R Coronae Borealis (R CrB). IRAS observations of R CrB are used as constraints in selecting the model parameters. ...
  • Models of Highly Extended Dust Shells Around the Supergiants R Coronae Borealis and W Hydrae 
    Nagendra, K. N; Leung, C. M (American Astronomical Society, 1990)
  • Modern astronomy : startling facts 
    Sivaram, C; Arun, K (Ane Books, 2009)
    The year 2009 is being recognised as the international year of astronomy (IYA) to mark the four hundredth anniversary of the historical occasion in the year 1609 when Galileo Galilei used the then newly invented telescope ...
  • Modern optical astronomy: technology and impact of interferometry 
    Saha, S. K (The American Physical Society, 2002-04)
    The present ``state of the art'' and the path to future progress in high-spatial-resolution imaging interferometry is reviewed. The review begins with a treatment of the fundamentals of stellar optical interferometry, the ...

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