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Browsing IIAP Publications by Title

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  • Magnetic shear in flaring regions. I - Quantitative evaluation of the change in shear 
    Sivaraman, K. R; Rausaria, R. R; Aleem, S. M (Springer Netherlands, 1992-04)
    We have evaluated the shear angle of the neutral line of the non-potential magnetic field for one or two days prior to and after the flare event for 10 cases. We have used the Hagr filament positions to evaluate the shear ...
  • Magnetic Structure in Successively Erupting Active Regions: Comparison of Flare-Ribbons With Quasi-Separatrix Layers 
    Vemareddy, P (Frontiers, 2021-10)
    This paper studies the magnetic topology of successively erupting active regions (ARs) 11,429 and 12,371. Employing vector magnetic field observations from Helioseismic and Magnetic Imager, the pre-eruptive magnetic ...
  • Magnetic Transport on the Solar Atmosphere by Laminar and Turbulent Ambipolar Diffusion 
    Hiraki, Y; Krishan, V; Masuda, S (IOP Publishing, 2010-09-10)
    The lower solar atmosphere consists of partially ionized turbulent plasmas harboring velocity field, magnetic field, and current density fluctuations. The correlations among these small-scale fluctuations give rise to ...
  • Magnetic transport on the solar atmosphere by turbulent ambipolar diffusion 
    Krishan, V; Masuda, S (Anita Publications, 2008-12)
    The lower solar atmosphere consists of partially ionized turbulent plasmas harboring velocity field, magnetic field and current density fluctuations. The correlations amongst these small scale fluctuations give rise to ...
  • A magneto-hydrodynamic study of pre-flare loops 
    Hasan, S. S (Institute of Theoretical Astrophysics, 1979)
    The magnetohydrodynamic equilibrium and stability of a configuration which may apply to solar pre-flare loops is analyzed based on the following scenario: (1) the loops exist much prior to the flare and in equilibrium with ...
  • Magnetoacoustic wave propagation in off-limb polar regions 
    O'Shea, E; Banerjee, D; Doyle, J. G (EDP Sciences, 2006-02)
    Aims.To find evidence of magnetoacoustic waves in off-limb polar regions. Methods.Using temporal series data from the Coronal Diagnostic Spectrometer (CDS) on SOHO, we study oscillations found in radiant flux and velocity ...
  • Magnetoatmospheric oscillations in sunspot umbrae 
    Hasan, S. S (The American Astronomical Society, 1990-01)
    The nature of umbral oscillations is investigated using an empirical model for the sunspot umbra, based on the model of Maltby et al. (1986). Approximating the sunspot as a thick flux tube of circular cross section, the ...
  • Magnetohydrodynamic equilibrium and stability of pre-flare loops - Constant pitch field 
    Hasan, S. S (D. Reidel Publishing Co.,, 1980-08)
    The equilibrium and stability of a loop in which energy storage occurs prior to a solar flare is discussed. Working on the hypothesis, that the onset of the flare begins only after sufficient magnetic energy has been stored ...
  • Magnetohydrodynamic waves in open coronal structures 
    Banerjee, D; Krishna Prasad, S; Pant, V; McLaughlin, J. A; Antolin, P; Magyar, N; Ofman, L; Tian, H; Van Doorsselaere, T; De Moorte, I; Wang, T. J (Springer Nature B.V, 2021-10)
    Modern observatories have revealed the ubiquitous presence of magnetohydrodynamic waves in the solar corona. The propagating waves (in contrast to the standing waves) are usually originated in the lower solar atmosphere ...
  • Magnetohydrodynamic waves in the solar corona 
    Satya Narayanan, A; Ramesh, R (Anita Publications, 2005)
  • Magnetohydrostatic equilibrium in starspots: dependences on color (Teff) and surface gravity (g) 
    Rajaguru, S. P; Hasan, S. S (Cambridge University Press, 2011-08)
    Temperature contrasts and magnetic field strengths of sunspot umbrae broadly follow the thermal-magnetic relationship obtained from magnetohydrostatic equilibrium. Using a compilation of recent observations, especially in ...
  • Magnetorotational instability in accretion disks 
    Krishan, V; Mahajan, S. M (Springer Netherlands, 2008)
    Accretion disks are a basic and an ubiquitous construct of nature. We describe their formation, briefly and qualitatively, in diverse astrophysical situations. These systems, though controlled by the gravitational forces, ...
  • MAGSAT and Geodynamo 
    Singh, B. P (Indian Institute of Astrophysics, Bangalore, 1988)
    Accurate, uniform and global vector magnetic field data obtained by MAGSAT provided a high resolution model of the earth’s magnetic field. It became possible to separate the core and crustal parts in spherical harmonic ...
  • Making Good Use of Bad Weather: Finding Extremely Metal-Poor Stars in the Clouds 
    Placco, V. M; Beers, T. C; Rossi, S; Kennedy, C; Christlieb, N; Lee, Y. S; Sivarani, T (Astronomical Society of the Pacific, 2012-12)
    Current results are presented for a new survey effort to search for Extremely Metal-Poor (EMP) and Carbon Enhanced Metal-Poor (CEMP) stars from the Hamburg / ESO objective-prism survey (HES). These stars are important ...
  • Manifestations of short-period electric field fluctuations in the equatorial lower thermosphere 
    Sastri, J. H; Ramesh, K. B; Rao, J. V. S. V; Rao, D. R. K (The Royal Swedish Academy of Sciences, 1988-03)
    Measurements (90h) of phase path, P of lower F-region (~ 200km) reflections at normal incidence over Kodaikanal (dip 3.0°N) revealed the time rate of change of phase path, (Doppler frequency shift, Δf) to undergo ...
  • Many-body effects in hyperfine interactions in 205Pb+ 
    Sonjoy, M; Sahoo, B. K; Chaudhuri, R. K; Das, B. P; Mukherjee, D (EDP Sciences, 2007-03)
    Ab initio calculations have been carried out to study the magnetic dipole and electric quadrupole hyperfine structure constants of 205Pb+. Many-body effects have been considered to all orders using the relativistic ...
  • Many-body methods for atoms and molecules 
    Chaudhuri, R. K; Chattopadhyay, S. K (CRC Press, 2017)
  • Many-body theory of the electric dipole moment of atomic ytterbium 
    Dilip, A; Das, B. P; Perger, W. F; Samal, M. K; Geetha, K. P (Institute of Physics, 2001-08)
    The existence of the permanent electric dipole moment (EDM) of an atom implies the simultaneous violation of parity and time-reversal symmetries. Two experiments based on laser cooling have been proposed to search for the ...
  • Mapping distortion of detectors in UVIT onboard astroSat observatory 
    Girish, V; Tandon, S. N; Sriram, S; Amit Kumar; Postma, J (Springer, 2017-02)
    Ultraviolet Imaging Telescope (UVIT) is one of the payloads onboard AstroSat, India’s first multi-wavelength Astronomy mission. UVIT is primarily designed to make high resolution images in wide field, in three wavelength ...
  • Mapping extinction using GALEX and SDSS photometric observations 
    Preethi, K; Gudennavar, S. B; Murthy, J (American Institute of Physics, 2013-06)
    The primary objective of this work is to create an all sky extinction map of the Milky Way galaxy. We have cross-matched the Sloan Digital Sky Survey (SDSS data release 8) photometric observations with that of Galaxy ...

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