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Browsing Publications of Astronomical Society of India by Subject "Magnetic field"

Browsing Publications of Astronomical Society of India by Subject "Magnetic field"

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  • Dynamics of Limb Flare and Associated Primary and Secondary Post Flare Loops 
    Uddin, W; Joshi, B; Chandra, R; Joshi, A (Astronomical Society of India, 2003)
    In this paper we present the analysis of M 1.8 class (GOES SXR) limb flare and associated post flare loops of 2 May, 2001 which erupted on the west limb in NOAA 9433 (N15, W88). The flare started at around 00:32 UT from a ...
  • Effect of a magnetic field on solar oscillation frequencies 
    Antia, H. M; Chitre, S. M (Astronomical Society of India, 2000)
  • Evolution of sunspots seen in molecular lines. I 
    Sinha, K; Tripathi, B. M (Astronomical Society of India, 1991)
    Equivalent-width calculations are conducted for lines of C2, MgH, and TiO relevant to photospheric and sunspot model atmospheres to determine the effects of magnetic field strength on line intensities. Sunspot models with ...
  • Evolution of the magnetic field in accreting neutron stars 
    Konar, S (Astronomical Society of India, 2000)
    There has been sufficient observational indication suggesting a causal connection between the binary history of neutron stars and the evolution of their magnetic field. In particular, it is believed that the generation of ...
  • Geometrical constriants on pulsar emission II 
    Kapoor, R. C; Shukre, C. S (Astronomical Society of India, 1999)
  • Large scale galactic magnetic fields : Need for a new theory of generation 
    Varma, R. K; Pandey, B. P (Astronomical Society of India, 1996)
  • Long-period oscillations of the sun's interior 
    Davila, J. M; Chitre, S. M (Astronomical Society of India, 1996)
    The long-period modes of a differentially rotating, solar-type star are consided. Two modes are found. The non-axisymmetric modes are Rossby waves, also known as r-modes, with the Coriolis force as the dominant restoring ...
  • Magnetic Field Geometry of 3C111 on pc-scales 
    Kharb, P; Gabuzda, D; Shastri, P (Astronomical Society of India, 2003)
    Multi-epoch Very Long Baseline Polarimetric observations of the Broad Line Radio galaxy 3C111 performed at 8 and 43 GHz after a large millimetre outburst, reveal rapidly evolving parsec-scale radioo structure and the ...
  • Non-linear stability of a self-gravitating fluid column in the presence of a magnetic field 
    Trehan, S. K (Astronomical Society of India, 1990)
    The amplitude modulation of a progressive wave in the presence of an axial magnetic field is examined for a self-gravitating cylinder. Zero-order, first-order, and higher-order solutions are obtained. The nonlinear cutoff ...
  • Of Neutrinos and Magnetars 
    Konar, S (Astronomical Society of India, 2003)
  • On the epochs of polarity reversals of the polar magnetic field of the sun during 1870-1982 
    Makarov, V. I; Sivaraman, K. R (Astronomical Society of Indian, 1986-09)
    The H-alpha synoptic charts for the 1904-1982 period and data on the polar prominences for the 1870-1905 period are used to investigate the polarity reversal of the polar magnetic field on the sun for 11 solar cycles. Good ...
  • On the unusual surge of 1991 November 16 
    Bondal, K. R; Gaur, V. P; Joshi, A; Uddin, W; Pande, M. C (Astronomical Society of India, 1994)
    An unusually 'long' surge of 'short' duration occurred in the NW region of the sun's limb on 1991 November 16, around 04 15 UT. Time-lapse photographic observations employing a Halle H-alpha filter having a 0.5/0.7 A ...
  • Periodicities in the Sun's "Torsional MHD oscillations" and planetary configurations 
    Javaraiah, J (Astronomical Society of India, 1996)
    Recently, we studied the rotaion of sunspot gruoups during 1879-1976 and detected ~ 22-yr and a few more other periods 'even' and 'odd' parity torsional oscillations of the Sun (Javaraiah & Gokhale 1995a, b). In the present ...
  • Quiet Sun Chromospheric Network Magnetic Field 
    Ravindra, B (Astronomical Society of India, 2003)
    The 3-D structure of quiet Sun chromospheric network magnetic field is studied by comparing the observed and computed chromospheric magnetograms. The comparison shows that the best correlation occurs at 1800 km above the ...
  • Steady parts of rotation and magnetic field in the sun's convective envelope 
    Hiremath, K. M; Gokhale, M. H (Astronomical Society of India, 1996)
    We use the full set of Chandrasekhar's (1956) MHD equations for determining the steady parts of rotation and poloidal as well as toroidal magnetic field, in the Sun's convective envelope assuming incompressibility. The ...
  • Twisted surge of 1981 December 25 
    Verma, V. K (Astronomical Society of India, 1983-03)
    Photographic observations and the morphological behaviour of the surge prominence of importance class 1 recorded with the 0.7 A passband H-alpha filter on 1981 December 25 have been described. The surge was recorded both ...

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