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Browsing IIAP Publications by Title

Browsing IIAP Publications by Title

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  • m-state Interference with Partial Frequency Redistribution for Polarized Line Formation in Arbitrary Magnetic Fields 
    Sampoorna, M (IOP Publishing, 2011-04-20)
    The present paper concerns the derivation of polarized partial frequency redistribution (PRD) matrices for scattering on a two-level atom in arbitrary magnetic fields. We generalize the classical theory of PRD that is ...
  • M.K.Vainu Bappu: father of modern astronomy in India 
    Babu, G. S. D (AP Akademi of Sciences, 2002)
  • The M31 pixel lensing plan campaign: macho lensing and self-lensing signals 
    Novati, S. C; Bozza, V; Bruni, I; Dall'Ora, M; Paolis, F. D; Dominik, M; Gualandi, R; Ingrosso, G; Jetzer, P; Mancini, L; Nucita, A; Safonova, M; Scarpetta, G; Sereno, M; Strafella, F; Subramaniam, A; Gould, A (IOP Publishing, 2014-03-10)
    We present the final analysis of the observational campaign carried out by the PLAN (Pixel Lensing Andromeda) collaboration to detect a dark matter signal in form of MACHOs through the microlensing effect. The campaign ...
  • M418: the low excitation PN around a WC1L star 
    Surendiranath, R; Kameswara Rao, N (International Astronomical Union, 1993)
  • A machine learning approach for classification of accretion states of black hole binaries 
    Sreehari, H; Nandi, Anuj (Oxford University Press on behalf of the Royal Astronomical Society, 2021-03)
    In this paper, we employ Machine Learning algorithms on multimission observations for the classification of accretion states of outbursting black hole X-ray binaries for the first time. Archival data from RXTE, Swift, MAXI, ...
  • Madras Observations of Biela's Comet 
    Pogson, N. R (John Wiley & Sons, Inc., 1874-08)
  • Madras observatory and the discovery of C/1831 A1 (The Great Comet of 1831) 
    Kapoor, R. C (Centre for Astronomy, James Cook University, 2011-07)
    In this paper we present excerpts from the records at the Indian Institute of Astrophysics Archives that show that T.G. Taylor, an astronomer at the Madras Observatory, was an independent discoverer of the Great Comet ...
  • Magnetic activities on active solar-type stars 
    Naik, S; Pandey, J. C; Naik, S; Savanov, I. S; Raj, A. (Societe Royale des Sciences de Liege, 2019-10)
    We present results obtained from the studies of magnetic activities on four solar-type stars (F-type star KIC 6791060, K-type star LO Peg, and two M-type planet-hosting stars K2–33 and EPIC 211901114) by using optical ...
  • Magnetic Activity and the Enhanced 5303 Ã Emission in Solar Active Regions 
    Ramesh, K. B; Nagabhushana, B. S; Varghese, B. A (Springer, 2001-03)
    Analysis of the intensity maps of Fexiv emission at λ=5303 Å obtained from the observations of ground-based coronagraphs during the sunspot minimum period 1985 and 1986 shows the persistent presence of localized strong ...
  • Magnetic activity in the photosphere of CoRoT-Exo-2a. Active longitudes and short-term spot cycle in a young Sun-like star 
    Lanza, A. F; Pagano, I; Leto, G; Messina, S; Aigrain, S; Alonso, R; Auvergne, M; Baglin, A; Barge, P; Bonomo, A. S; Boumier, P; Collier Cameron, A; Comparato, M; Cutispoto, G; de Medeiros, J. R; Foing, B; Kaiser, A; Moutou, C; Parihar, P. S; Silva-Valio, A; Weiss, W. W (EDP Sciences, 2009-01)
    Context: The space experiment CoRoT has recently detected transits by a hot Jupiter across the disc of an active G7V star (CoRoT-Exo-2a) that can be considered as a good proxy for the Sun at an age of approximately 0.5 ...
  • Magnetic and velocity properties of G-band bright points around a pore 
    Rangarajan, K. E; Sankarasubramanian, K; Nagaraju, K (Astronomical Society of the Pacific, 2009-06)
    Physical properties of G-band bright points (GBPs) surrounding a pore are studied using observations spanning from photosphere to chromosphere. The magnetic field strengths obtained in these bright points are of the order ...
  • Magnetic dipole hyperfine interactions in 137Ba+ and the accuracies of the neutral weak interaction matrix elements 
    Sahoo, B. K; Gopakumar, G; Chaudhuri, R. K; Das, B. P; Merlitz, H; Mahapatra, U. S; Mukherjee, D (The American Physical Society, 2003-10)
    The relativistic coupled-cluster method is applied to calculate the magnetic dipole hyperfine constant “A” of the 6s1/2, 6p1/2, 6p3/2, and 5d3/2 states of singly ionized barium. After the inclusion of two-body correlation ...
  • The magnetic disturbance field at kodaikanal 
    Thiruvengadathan, A (The Manager Government of India Press, Simla, 1956-10)
    The magnetic disturbance field at Kodaikanal has been studied, using the data for the period March 1950 to February 1954. As far as the horizontal magnetic field is concerned, it is found that the form of the disturbance ...
  • Magnetic Field and Plasma Diagnostics for Solar Coronal Mass Ejections: A Case Study Using the Forward Modeling Approach 
    Liu, X; Tian, H; Torok, T; Gibson, S; Yang, Z; Li, W; Samanta, T (Springer Nature B.V., 2023-10)
    The proposed COronal Solar Magnetism Observatory (COSMO) Large Coronagraph (LC) will provide unique observations to study coronal mass ejections (CMEs) with its ability to diagnose the magnetic field and plasma properties ...
  • 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. ...
  • Magnetic Field Geometry in `Red' and `Blue' BL Lacs 
    Kharb, P; Gabuzda, D. C; Shastri, P (Springer, 2003-10)
    We compare the systematics of the magnetic field geometry in the `red' low-energy peaked BL Lacs (LBLs) and `blue' high-energy peaked BL Lacs (HBLs) using VLBI polarimetric images. The LBLs are primarily `radio-selected' ...
  • The magnetic field geometry of small solar wind flux ropes inferred from their twist distribution 
    Yu, W; Farrugia, C. J; Lugaz, N; Galvin, A. B; Mostl, C; Paulson, K; Vemareddy, P (Springer, 2018-12)
    This work extends recent efforts on the force-free modeling of large flux ropetype structures (magnetic clouds, MCs) to much smaller spatial scales. We first select small flux ropes (SFRs) by eye whose duration is unambiguous ...
  • Magnetic field geometry of the broad line radio galaxy 3C111 
    Kharb, P; Gabuzda, D. C; Alef, W; Preuss, E; Shastri, P (Elsevier, 2003-10)
    Very Long Baseline Polarimetric observations of the Broad Line Radio galaxy 3C111 performed in July and September of 1996 at 8 and 43 GHz reveal rapidly evolving parsec-scale radio structure after a large millimetre outburst. ...
  • Magnetic field gradient and flare: study of a small flare in NOAA 8038 
    Mathew, S. K; Ambastha, A (Springer, 2000-11)
    Active region NOAA 8038 was observed from 10 to 13 May, 1997 using the USO solar video magnetograph. During this period, the active region was mostly inactive, and gave rise to only a single notable flare of 1N/C1.3 class ...
  • The Magnetic Field in the Milky Way Filamentary Bone G47 
    Stephens, Ian W; Myers, Philip C; Zucker, Catherine; Jackson, James M; Andersson, B.-G; Smith, Rowan; Archana Soam; Battersby, Cara; Sanhueza, Patricio; Hogge, Taylor; Smith, Howard A; Novak, Giles; Sadavoy, Sarah; Pillai, Thushara G.S; Li, Zhi-Yun; Looney, Leslie W; Sugitani, Koji; Coude, Simon; Guzman, Andres; Goodman, Alyssa; Kusune, Takayoshi; Santos, Fabio P; Zuckerman, Leah; Encalada, Frankie (IOP Publishing, 2022-02-10)
    Star formation primarily occurs in filaments where magnetic fields are expected to be dynamically important. The largest and densest filaments trace the spiral structure within galaxies. Over a dozen of these dense (∼104 ...

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