IIA Institutional Repository: Recent submissions

  • A Statistical Study on the Frequency-dependent Damping of the Slow-mode Waves in Polar Plumes and Interplumes 
    Mandal, Sudip; Krishna Prasad, S; Banerjee, D (IOP Publishing, 2018-02)
    We perform a statistical study on the frequency-dependent damping of slow waves propagating along polar plumes and interplumes in the solar corona. Analysis of a large sample of extreme ultraviolet imaging data with ...
  • Evolution of time concept in physics and in philosophy 
    Sivaram, C; Arun, K; Kiren, O. V (Science Publications, 2015-07)
    What is ‘time’? This is a question that has perplexed many aphysicist and philosophers alike. The perception of the passage of timeappears ingrained in all biological systems where growth, evolution anddecay of objects, ...
  • Primary Mirror Active Control System Simulation of Prototype Segmented Mirror Telescope 
    Prasanna Deshmukh; Mishra, Deepta Sundar; Parihar, P. S; Vedashree (IEEE, 2017-01)
    The upcoming large astronomical telescopes are trending towards the Segmented Mirror Telescope (SMT) technology, initially developed at the W M Keck Observatory in Hawaii, where two largest SMTs in the world are in use. ...
  • A soft actuator for prototype segmented mirror telescope 
    Prasanna, Deshmukh; Parihar, P. S; Mishra, Deepta Sundar; Prakash, Ajin; Kemkar, P. M. M (SPIE-The International Society for Optical Engineering, 2016-07)
    The Segmented Mirror Telescopes (SMT) are built using small hexagonal mirror segments placed side by side to form a monolithic primary mirror of very large size. The effective figure of such a segmented primary mirror is ...
  • Optical and Near-infrared Study of Nova V2676 Oph 2012 
    Raj, A; Das, R. K; Walter, F. M (IOP Publishing, 2017-02-01)
    We present optical spectrophotometric and near-infrared (NIR) photometric observations of the nova V2676 Oph covering the period from 2012 March 29 through 2015 May 8. The optical spectra and photometry of the nova have ...
  • Prospect for UV observations from the Moon. II. Instrumental design of an ultraviolet imager LUCI 
    Mathew, J; Prakash, A; Mayuresh, Sarpotdar; Sreejith, A. G; Nirmal, K; Ambily, S; Safonova, M; Murthy, J; Brosch, N (Springer, 2017-02)
    We present a design for a near-ultraviolet (NUV) imaging instrument which may be flown on a range of available platforms, including high-altitude balloons, nanosatellites, or space missions. Although all current UV space ...
  • Photometric metallicity map of the large magellanic cloud 
    Choudhury, Samyaday; Subramaniam, A; Cole, A. A (Oxford University Press on behalf of the Royal Astronomical Society, 2016-01)
    We have estimated a metallicity map of the Large Magellanic Cloud (LMC) using the Mag- ellanic Cloud Photometric Survey (MCPS) and Optical Gravitational Lensing Experiment (OGLE III) photometric data. This is a first of ...
  • Solar coronal magnetic fields derived using seismology techniques applied to omnipresent sunspot waves 
    Jess, D. B; Reznikova, V. E; Ryans, R. S. I; Christian, D. J; Keys, P. H; Mathioudakis, M; Mackay, D. H; Krishna Prasad, S; Banerjee, D; Grant, S. D. T; Yau, S; Diamond, C (Nature Publishing Group, 2016-02)
    Sunspots on the surface of the Sun are the observational signatures of intense manifestations of tightly packed magnetic field lines, with near-vertical field strengths exceeding 6,000 G in extreme cases. It is well accepted ...
  • A Global galactic dynamo with a corona constrained by relative helicity 
    Avijeet Prasad; Mangalam, A (IOP Publishing, 2016-01)
    We present a model for a global axisymmetric turbulent dynamo operating in a galaxy with a corona that treats the parameters of turbulence driven by supernovae and by magneto-rotational instability under a common ...
  • NuSTAR, Swift, and GROND observations of the flaring MeV blazar PMN J0641-0320 
    Ajello, M; Ghisellini, G; Paliya, Vaidehi S; Kocevski, D; Tagliaferri, G; Madejski, G; Rau, A; Schady, P; Greiner, J; Massaro, F; Balokovic, M; Buhler, R; Giomi, M; Marcotulli, L; D'Ammando, F; Stern, D; Boggs, S. E; Christensen, F. E; Craig, W. W; Hailey, C. J; Harrison, F. A; Zhang, W. W (IOP Publishing, 2016-07-20)
    MeV blazars are a sub-population of the blazar family, exhibiting larger-than-average jet powers, accretion luminosities, and black hole masses. Because of their extremely hard X-ray continua, these objects are best studied ...
  • A search for QPOs in the lazar OJ287: preliminary results from the 2015/2016 observing campaign 
    Zola, S; Valtonen, M; Bhatta, G; Goyal, A; Debski, B; Baran, A; Krzesinski, J; Siwak, M; Ciprini, S; Gopakumar, A; Jermak, H; Nilsson, K; Reichart, D; Matsumoto, K; Sadakane, K; Gazeas, K; Kidger, M; Piirola, V; Alicavus, F; Baliyan, K. S; Berdyugin, A; Boyd, D; Campas Torrent, M; Campos, F; Carrillo G-mez, J; Caton, D. B; Chavushyan, V; Dalessio, J; Dimitrov, D; Drozdz, M; Er, H; Erdem, A; Escartin Perez, A; Fallah Ramazani, V; Filippenko, A. V; Garcia, F; Gomez Pinilla, F; Maheswar, G; Haislip, J. B; Harmanen, J; Hudec, R; Hurst, G; Ivarsen, K. M; Jelinek, M; Joshi, A; Kagitan, M; Kaur, N; Keel, W. C; LaCluyze, A. P; Lee, B. C; Lindfors, E; Lozano de Haro, J; Moore, J. P; Mugrauer, M; Naves Nogues, R; Neely, A. W; Nelson, R. H; Ogloza, W; Okano, S; Pandey, J. C; Perri, M; Pihajoki, P; Poyner, G; Provencal, J; Pursimo, T; Raj, A; 29 others (Molecular Diversity Preservation International, 2016-12)
    We analyse the light curve in the R band of the blazar OJ287, gathered during the 2015/2016 observing season. We did a search for quasi-periodic oscillations (QPOs) using several methods over a wide range of timescales. ...
  • A Hard gamma-ray flare from 3C 279 in 2013 December 
    Paliya, Vaidehi S; Diltz, Chris; Bottcher, Markus; Stalin, C. S; Buckley, David (IOP Publishing, 2016-01)
    The blazar 3C 279 exhibited twin γ -ray fl ares of similar intensity in 2013 December and 2014 April. In this work, we present a detailed multi-wavelength analysis of the 2013 December fl aring event. Multi-frequency ...
  • Black Holes in Our Universe: Do they Inch up the Mass Ladder? 
    Shastri, P (Indian Academy of Sciences, 2017-03)
    Current technologies have enabled glimpses at the many facets of black holes, which we know to be plentiful in our cosmos. A panoramic view of the evidence for them is presented here across the large range of masses that ...
  • A butterfly diagram and carrington maps for century-long Ca II K spectroheliograms from the Kodaikanal Observatory 
    Chatterjee, Subhamoy; Banerjee, D; Ravindra, B (IOP Publishing, 2016-08-10)
    The century-long (1907–2007) Ca II K spectroheliograms from the Kodaikanal Solar Observatory (KSO) are calibrated, processed, and analyzed to follow the evolution of the bright on-disc structures called plages, possible ...
  • Diagnostics of a coronal hole and the adjacent quiet sun by the hinode/EUV Imaging Spectrometer (EIS) 
    Kayshap, P; Banerjee, D; Srivastava, A. K (Springer, 2015-10)
    A comparison between a coronal hole (CH) and the adjacent quiet Sun (QS) has been performed using the spectroscopic diagnostics of the Hinode/EUV Imaging Spectrometer (EIS). Based on spectral signatures, we identify the ...
  • Meridional circulation in the solar convection zone: time-distance helioseismic inferences from four years of HMI/SDO observations 
    Rajaguru, S. P; Antia, H. M (IOP Publishing, 2015-11-10)
    We present and discuss results from time–distance helioseismic measurements of meridional circulation (MC) in the solar convection zone using 4 yr of Doppler velocity observations by the Helioseismic and Magnetic Imager ...
  • Full-disk synoptic observations of the chromosphere using Hα telescope at the Kodaikanal Observatory 
    Ravindra, B; Prabhu, K; Rangarajan, K. E; Bagare, S. P; Singh, J; Kemkar, P. M. M; Thulasidharen, K. C; Gabriel, F; Selvendran, R (IOP Publishing, 2016-08)
    This paper reports on the installation and observations of a new solar telescope installed on 2014 October 7 at the Kodaikanal Observatory. The telescope is a refractive type equipped with a tunable Lyot Hα filter. A CCD ...
  • Simulating charge transport to understand the spectral response of swept charge devices 
    Athiray, P. S; Sreekumar, P; Narendranath, S; Gow, J. P. D (EDP Sciences, 2015-11)
    Context. Swept Charge Devices (SCD) are novel X-ray detectors optimized for improved spectral performance without any demand for active cooling. The Chandrayaan-1 X-ray Spectrometer (C1XS) experiment onboard the Chandrayaan-1 ...
  • Analysis of sudden variations in photospheric magnetic fields during a large flare and their influences in the solar atmosphere 
    Brajesh, Kumar; Raja Bayanna, A; Venkatakrishnan, P; Kuchandy Mathew, S (IOP Publishing, 2016-08)
    The solar active region NOAA 11719 produced a large two-ribbon flare on 2013 April 11. We have investigated sudden variations in the photospheric magnetic fields in this active region during the flare by employing magnetograms ...
  • Revealing the nature of star forming blue early-type galaxies at low redshift 
    George, K; Zingade, K (EDP Sciences, 2015-11)
    Context. Star forming early-type galaxies with blue optical colours at low redshift can be used to test our current understanding of galaxy formation and evolution. Aims. We want to reveal the fuel and triggering mechanism ...

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