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Browsing IIAP Publications by Title

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  • Dust reverberation mapping of Z229–15 
    Mandal, A. K; Rakshit, S; Stalin, C. S; Wylezalek, D; Patig, M. K; Sagar, R; Mathew, B; Muneer, S; Pal, I (Oxford University Press on behalf of the Royal Astronomical Society, 2021-03)
    We report results of the dust reverberation mapping (DRM) on the Seyfert 1 galaxy Z229–15 at z = 0.0273. Quasi-simultaneous photometric observations for a total of 48 epochs were acquired during the period 2017 July to ...
  • Dust scattered radiation in the galactic poles 
    Murthy, J; Henry, R. C; Overduin, James (Indian Academy of Sciences, 2023-12)
    We have modeled the diffuse background at the Galactic Poles in the far-ultraviolet (FUV: 1536 Å) and the near-ultraviolet (NUV: 2316 Å). The background is well-fit using a single-scattering dustmodel with an offset ...
  • Dust scattering from the taurus molecular cloud 
    Sathya Narayan; Murthy, J; Narayanankutty, K (Oxford University Press on behalf of the Royal Astronomical Society, 2017-04)
    We present an analysis of the diffuse ultraviolet emission near the Taurus Molecular Cloud based on observations made by the Galaxy Evolution Explorer. We used a Monte Carlo dust scattering model to show that about half ...
  • Dust-Alfvenic Shocklets in Dusty Plasmas 
    Shukla, P. K; Morfill, G. E; Krishan, V (IOP Publishing, 2004)
    We show that the Hall dust magnetohydrodynamic equations admit a non-stationary dust-Alfvénic shock solution in dusty plasmas. The dust-Alfvénic shocklet (DAS) occurs on a long temporal (dust gyroperiod) and spatial (dust ...
  • Dust-scattered Ultraviolet Halos around Bright Stars 
    Murthy, J; Conn Henry, R (IOP Publishing, 2011-06-10)
    We have discovered ultraviolet (UV) halos extending as far as 5° around four (of six) bright UV stars using data from the Galaxy Evolution Explorer satellite. These halos are due to scattering of the starlight from nearby ...
  • Dynamic Loading Assembly for Testing Actuators of Segmented Mirror Telescope 
    Prasanna Deshmukh; Parihar, P. S; Balasubramaniam, K. A; Mishra, Deepta Sundar; Mahesh, P. K (World Scientific Publishing Co., 2017-09)
    Upcoming large telescopes are based on Segmented Mirror Telescope (SMT) technology which uses small hexagonal mirror segments placed side by side to form the large monolithic surface. The segments alignment needs to be ...
  • Dynamic responses of sunspots to their ambient magnetic configuration 
    Bagare, S. P (Cambridge University Press, 2011-08)
    In our earlier study of a revisit of the classic Wilson Effect, it was found that a large proportion of sunspots do not display the geometric effect which is ascribed to a depression of the umbra. It was shown that the ...
  • The dynamical behaviour of a jet in an on-disk coronal hole observed with AIA/SDO 
    Chandrashekhar, K; Morton, R. J; Banerjee, D; Gupta, G. R (EDP Sciences, 2014-02)
    Aims. Extreme ultraviolet (EUV) jets situated in coronal holes are thought to play an important role in supplying heated material to the corona and solar wind. The multi-wavelength capabilities and high signal-to-noise ...
  • Dynamical Effects in Solar Photospheric Flux Tubes 
    Hasan, S. S (Kluwer Academic Publisher, 1996)
    The interaction of an intense flux tube, extending vertically through the photosphere, with p-modes in the ambient medium is modelled by solving the time dependent MHD equations in the thin flux tube approximation. It is ...
  • The Dynamical Evolution of a Star Cluster 
    Sunder, G. S; Kochhar, R. K (International Astronomical Union, 1987)
    Using the second order tensor virial equations and the equation for the rate of change of the kinetic energy tensor, the authors follow the dynamical evolution of a star cluster with anisotropic velocity distribution. They ...
  • Dynamical evolution of x-ray bright points with hinode/XRT 
    Kariyappa, R; Varghese, B. A; DeLuca, E. E; van Ballegooijen, A. A (Springer, 2010)
    We analyzed a 7-h long time sequence of soft X-ray images obtained on 14 April 2007 from a quiet region using the X-Ray Telescope (XRT) onboard Hinode. The aim was to observe intensity oscillations in coronal XBPs of ...
  • Dynamical friction and the escape of a compact supermassive object shot from the center of a galaxy 
    Kapoor, R. C (D. Reidel Publishing Company, 1985-12)
    A numerical study has been made of the motion of a compact object consisting of a supermassive black hole with a dense cluster of stars around through a galaxy which has recoiled from the center of the latter as a result ...
  • Dynamical interplay of disc thickness and interstellar gas: Implication for the longevity of spiral density waves 
    Ghosh, S; Jog, Chanda J (EDP Sciences, 2022-02)
    A typical galactic disc has a finite thickness. In addition to stars, it also contains a finite amount of interstellar gas. Here, we investigate the physical impact of the finite thickness of a galactic disc on the disc ...
  • Dynamical phenomena in sunspots. I. Time dependent relaxation to equilibrium 
    Gangadhara, R. T; Hasan, S. S (European Southern Observatory, 1997-11)
    We have adapted a general purpose time-dependent 2-D code to study dynamical phenomena in sunspots. In the first part of our investigation, we numerically simulate the dynamical relaxation to equilibrium of a sunspot. ...
  • Dynamical Processes in Flux Tubes and their Role in Chromospheric Heating 
    Hasan, S. S (Indian Academy of Sciences, 2000-12)
    We model the dynamical interaction between magnetic flux tubes and granules in the solar photosphere which leads to the excitation of transverse (kink) and longitudinal (sausage) tube waves. The investigation is motivated ...
  • The DynaMICCS perspective. A mission for a complete and continuous view of the Sun dedicated to magnetism, space weather and space climate 
    Turck-Chieze, S; Lamy, P; Carr, C; Carton, P. H; Chevalier, A; Dandouras, I; Defise, J. M; Dewitte, S; Dudok de Wit, T; Halain, J. P; Hasan, S. S; Hochedez, J. F; Horbury, T; Levacher, P; Meissonier, M; Murphy, N; Rochus, P; Ruzmaikin, A; Schmutz, W; Thuillier, G; Vives, S (Springer Netherlands, 2009-03)
    The DynaMICCS mission is designed to probe and understand the dynamics of crucial regions of the Sun that determine solar variability, including the previously unexplored inner core, the radiative/convective zone interface ...
  • Dynamics and heating of the magnetic network on the Sun. Efficiency of mode transformation 
    Hasan, S. S; Ulmschneider, P (EDP Sciences, 2004-12)
  • Dynamics of accretion and winds in tidal disruption events 
    Mageshwaran, T; Mangalam, A (Elsevier B. V, 2021-02)
    We have constructed self-similar models of a time-dependent accretion disk in both sub and super-Eddington phases with wind outflows for tidal disruption events (TDEs). The physical input parameters are the black hole (BH) ...
  • Dynamics of charged particles in the radio emission region of pulsar magnetosphere 
    Thomas, R. M. C; Gangadhara, R. T (EDP Sciences, 2007-06)
    We consider the classical picture of three dimensional motion of charged particles in pulsar magnetosphere. We adopt a perturbative method to solve the equation of motion, and find the trajectory of particles as they move ...
  • Dynamics of coronal bright points as seen by Sun watcher using active pixel system detector and image processing (SWAP), atmospheric imaging assembly (AIA), and helioseismic and magnetic imager (HMI) 
    Chandrashekhar, K; Krishna Prasad, S; Banerjee, D; Ravindra, B; Seaton, D. B (Springer, 2013-08)
    The Sun Watcher using Active Pixel system detector and Image Processing (SWAP) onboard the PRoject for OnBoard Autonomy-2 (PROBA2) spacecraft provides images of the solar corona in EUV channel centered at 174 Å. These data, ...

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