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Browsing IIAP Publications by Title

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  • HALL-MHD turbulence in the Solar atmosphere 
    Krishan, V; Mahajan, S. M (Springer, 2004-03)
    When the velocity field of a magneto-fluid is accorded an intrinsically equal status with the magnetic field, standard magnetohydrodynamics (MHD) must be replaced by the dispersive or Hall MHD which retains some crucial ...
  • Hall-MHD Turbulence in the Solar Wind 
    Krishan, V; Mahajan, S. M (The Royal Swedish Academy of Sciences, 2005)
    The solar wind is a great paradigm for investigating magnetohydrodynamic turbulence. It is shown that the frame work of Hall magnetohydrodynamics (HMHD), which can support three quadratic invariants and allows nonlinear ...
  • The Halo CME Event Of 23 October 1997 - Low-Frequency Radio Observations Of The Pre-Event Corona 
    Ramesh, R (Springer, 2000-09)
    We report low-frequency observations of an enhancement in the solar corona prior to the halo coronal mass ejection of 23 October 1997, with the Gauribidanur radioheliograph. The Sun was `quiet' and no radio bursts were ...
  • The Hamburg/ESO R-process Enhanced Star survey (HERES) VIII. The r+s star HE 1405 0822 
    Cui, W. Y; Sivarani, T; Christlieb, N (EDP Sciences, 2013-10)
    Aims. The aim of this study is a detailed abundance analysis of the newly discovered r-rich star HE 1405−0822, which has [Fe/H] = −2.40. This star shows enhancements of both r- and s-elements, [Ba/Fe] = + 1.95 and [Eu/Fe] ...
  • Hanle echelle spectrograph: design and performance 
    Sriram, S; Amit Kumar; Arun Surya; Sivarani, T; Giridhar, S; Kathiravan, S; Anand, M. N; Jones, D; Grobler, D; Jakobsson, R; Anantha, Ch; Athira Unni; Angchuk, D; Tsewang, D; Gyalson, T (SPIE-The International Society for Optical Engineering, 2018-07-06)
    Hanle echelle spectrograph (HESP) is a high resolution, bench mounted, fiber-fed spectrograph at visible wavelengths. The instrument was recently installed at the 2m Himalayan Chandra Telescope (HCT), located at Indian ...
  • The Hanle effect as diagnostic tool for turbulent magnetic fields 
    Anusha, L. S; Sampoorna, M; Frisch, H; Nagendra, K. N (Springer, 2010)
    The Hanle effect is calculated for a random magnetic field characterized by a finite correlation length and a probability density function of the magnetic field vector. It is shown that linear polarization is essentially ...
  • The hanle effect in a random magnetic field: dependence of the polarization on statistical properties of the magnetic field 
    Frisch, H; Anusha, L. S; Sampoorna, M; Nagendra, K. N (EDP Sciences, 2009-07)
    The Hanle effect is used to determine weak turbulent magnetic fields in the solar atmosphere, usually assuming that the angular distribution is isotropic, the magnetic field strength constant, and that micro-turbulence ...
  • The Hanle Effect with Angle Dependent Redistribution Functions 
    Frisch, H; Faurobert, M; Nagendra, K. N (Astronomical Society of the Pacific, 2001)
    Numerical work with the Hanle effect, taking into account Partial frequency Redistribution (PRD) effects has so far been studied with the approximation that frequency redistribution can be described by an angle-average ...
  • Hanle Effect with Angle-dependent Partial Frequency Redistribution in Threedimensional Media 
    Anusha, L. S (American Astronomical Society, 2023-06-01)
    There has been a constant improvement in the observational measurement of linear polarization in chromospheric spectral lines in the last three decades. However, modeling polarized profiles of these lines still remains ...
  • Hanle effect with angle-dependent partial redistribution 
    Nagendra, K. N; Frisch, H; Faurobert, M (The European Southern Observatory, 2002-11)
    The polarized line transfer equation for the Hanle effect is solved in the framework of an exact partial frequency redistribution (PRD) theory developed by Bommier (1997a,b). In that theory the effect of collisions on the ...
  • The Hanle effect with partial frequency redistribution. Construction of a frequency-dependent polarization matrix and numerical solution by a PALI method 
    Sampoorna, M; Nagendra, K. N; Frisch, H (Elsevier, 2008-09)
    The polarized approximate lambda iteration (PALI) technique developed for the weak field Hanle effect relies on the decomposition of the Stokes parameters I, Q and U into six cylindrically symmetrical components. It has ...
  • Hanle-Zeeman Redistribution Matrix. I. Classical Theory Expressions in the Laboratory Frame 
    Sampoorna, M; Nagendra, K. N; Stenflo, J. O (University of Chicago Press, 2007-07)
    Polarized scattering in spectral lines is governed by a 4×4 matrix that describes how the Stokes vector is scattered and redistributed in frequency and direction. Here we develop the theory for this redistribution matrix ...
  • Hanle-Zeeman Redistribution Matrix. II. Comparison of Classical and Quantum Electrodynamic Approaches 
    Sampoorna, M; Nagendra, K. N; Stenflo, J. O (University of Chicago Press, 2007-12)
    The Hanle-Zeeman redistribution matrix accounts for the intricately coupled correlations in frequency, angle, and polarization between the incoming and outgoing radiation and embodies the physics of the scattering process. ...
  • Hanle-Zeeman Redistribution Matrix. III. Solution of the Polarized Line Formation Problem 
    Sampoorna, M; Nagendra, K. N; Stenflo, J. O (The American Astronomical Society, 2008-05)
    The polarized radiative transfer equation is solved numerically, taking into account both the Zeeman absorption matrix and the Hanle-Zeeman redistribution matrix, to obtain line profiles for arbitrary magnetic field ...
  • Hanle-Zeeman Scattering Matrix for Magnetic Dipole Transitions 
    Megha, A; Sampoorna, M; Nagendra, K. N; Sankarasubramanian, K (IOP Publishing, 2017-07)
    The polarization of the light that is scattered by the coronal ions is influenced by the anisotropic illumination from the photosphere and the magnetic field structuring in the solar corona. The properties of the coronal ...
  • 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 ...
  • Hard X-ray characteristics of solar flares using electron Monte-Carlo calculations and beamed thick target model 
    Rausaria, R. R (Springer Netherlands, 1992-08)
    The experimental results of X-ray bursts with spectral characteristics, spatial distribution, fast time variations, polarization, and directivity measurements carried out with Intercosmos, PVO/ISEE-3 spacecrafts, imaging ...
  • Hard X-ray flux variations in AGN from NuSTAR 
    Priyanka Rani; Stalin, C. S (Astronomical Society of India, 2015-04)
    We present here our results on the hour like time scale Xray flux variations in a sample of active galactic nuclei using data from the Nuclear Spectroscopic Telescope Array (NuSTAR). We find that in the 3−79 keV band, ...
  • Hard-Core Bosons in a Zig-Zag Optical Superlattice 
    Dhar, A; Mishra, T; Pai, R. V; Mukerjee, S; Das, B. P (American Physical Society, 2013-11-21)
    We study a system of hard-core bosons at half-filling in a one-dimensional optical superlattice. The bosons are allowed to hop to nearest- and next-nearest-neighbor sites. We obtain the ground-state phase diagram as a ...
  • Harmonically related decimetric fine structures 
    Sawant, H. S; Fernandes, F. C. R; Karlický, M; Mészárosová, H; Krishan, V; Cecatto, J. R; Madsen, F. R. H; Andrade, M. C (Elsevier B.V., 2006-02)
    We report rare events, above 1000 MHz, in which emission at the fundamental and at second harmonic frequencies show nearly identical fine structures. These high resolution observations are obtained from the Brazilian Solar ...

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