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Browsing IIAP Publications by Title

Browsing IIAP Publications by Title

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  • Metric-affine effects in crystallization processes of white dwarfs 
    Kalita, Surajit; Sarmah, Lupamudra; Wojnar, Aneta (2023-02-15)
    We analyze the effects of modified gravity on specific heats of electrons and ions, Debye temperature, crystallization process, and cooling mechanism in white dwarfs. We derive the Lane-Emden-Chandrasekhar equation and ...
  • MG II emission of Pop. 2 long-period Cepheids 
    Parthasarathy, M; Parsons, S. B (1984-12)
    The Population II Cepheid pulsational variables AL Vir (P = 10.3 days) and W Vir (P = 17.3 days) were observed with IUE at two phases each. Only low-dispersion mid-UV exposures were feasible, but were sufficient to show a ...
  • MHD Seismology of a loop-like filament tube by observed kink waves 
    Pant, V; Srivastava, A. K; Banerjee, D; Goossens, M; Chen, P.-F; Joshi, N. C; Zhou, Y.-H (IOP Publishing, 2015-10)
    We report and analyze observational evidence of global kink oscillations in a solar filament as observed in Hα by instruments administered by National Solar Observatory (NSO)/Global Oscillation Network Group (GONG). An ...
  • MHD waves at a tangential discontinuity with inclined magnetic fields and flows 
    Satya Narayanan, A; Pandey, V; Venkatakrishnan, P (European Solar Physics, 2008-09)
    Propagation of magnetohydrodynamic (MHD) waves in inhomo- geneous magnetic plasmas is interesting from space and astrophysical point of view. In this study, the combined effect of non-parallel propagation, steady flow and ...
  • MHD Waves in Coronal Holes 
    Banerjee, D; Krishna Prasad, S (John Wiley & Sons, Inc., 2015-05)
    Coronal holes are the dark patches in the solar corona associated with relatively cool, less dense plasma and unipolar fields. The fast component of the solar wind emanates from these regions. Several observations ...
  • MHD waves on the Sun 
    Hasan, S. S (Indian Association for the Cultivation of Science, 1992)
    Theoretical aspects of wave propagation in an atmosphere with a vertical magnetic field are reviewed. Starting from the ideal magneto hydrodynamic equations. The differential equations governing linear oscillations presented ...
  • Micro-fluctuations of fried's parameter (ro) 
    Saha, S. K; Yeswanth, L (Anita Publications, 2004)
    The atmospheric coherence is a highly variable parameter depending upon the high velocity wind. The size of the atmospheric coherence length widely known as, Fried's parameter, ro, has been computed during night at the ...
  • Microflares in accretion disks 
    Krishan, V; Ramadurai, S; Wiita, P. J (The European Southern Observatory, 2003-02)
    We have investigated the phenomenon of explosive chromospheric evaporation from an accretion disk as a mechanism for fast variability in accreting sources such as low mass X-ray binaries and active galactic nuclei. This ...
  • Microwave emission from late-type dwarf stars UV Ceti and YZ Canis Minoris 
    Kundu, M. R; Shevgaonkar, R. K (The University of Chicago Press, 1985-10-15)
    Simultaneous high-resolution observations of two late-type dwarf stars, UV Cet and YZ CMi, at 6 and 20 cm are presented. These observations put sufficient constraints on existing interpretations to conclude that the quiescent ...
  • Microwave Propagation and Troposphere: Eclipse Time Observation 
    Mishra, U; Sen, S; Sharma, S; Barbara, A. K; Devi, M (Indian Institute of Astrophysics, Bangalore, 1997)
    The effect of 24th October 1995 solar eclipse were studied on the reception of Latikor-Shillong and Nongpiur-Shillong links both operating at a frequency of 11GHz. The surface temperature, pressure and humidity were ...
  • Mid-infrared variability of γ-ray emitting blazars 
    Anjum, A; Stalin, C. S; Rakshit, S; Gudennavar, S. B; Durgapal, A (Oxford University Press on behalf of the Royal Astronomical Society, 2020-05)
    Using data from the Wide-field Infrared Survey Explorer, we studied the mid-infrared (mid-IR) 3.4 μm (W1-band) and 4.6 μm (W2-band) flux variability of γ-ray emitting blazars. Our sample consists of 460 flat spectrum radio ...
  • Mid-infrared variations of R Coronae Borealis stars 
    Kameswara Rao, N; Lambert, D. L (Oxford University Press on behalf of the Royal Astronomical Society, 2015-03-11)
    Mid-infrared (IR) photometry of R Coronae Borealis stars obtained from various satellites from Infrared Astronomical Satellite (IRAS) to Wide-field Infrared Survey Explorer (WISE) has been utilized in studying the ...
  • Mid-term periodicities in solar radio emission corresponding to sunspot number during solar cycle 23 
    Aroori, Mahender; Vemareddy, P; Chowdhury, Partha; Yellaiah, G (Springer, 2021-03)
    We present a systematic time-series analysis of solar radio emission in nine different frequencies to compare with that of daily sunspot number (SSN) during Solar Cycle 23 (1996-2009). Owing to the contribution from quiet-sun ...
  • Mid-term quasi-periodicities in the CaII-K plage index of the Sun and their implications 
    Chowdhury, P; Gokhale, M. H; Singh, J; Moon, Y.-J (Springer, 2016-02)
    We present results of the fast Fourier transform (FFT), the MEM analysis, and the wavelet analysis (WA), of the temporal variation of the monthly disk integrated “CaII-K plage-area and enhanced network (EN) area” hereafter ...
  • Mid-ultraviolet and optical photometry of helium stars 
    Kilambi, G. C; Nagar, P; Kameswara Rao, N (Indian Academy of Sciences, 1992-06)
    Mid-ultraviolet and optical photometric analysis of helium stars are presented. A linear relation exists between the effective temperature derived from model atmospheres and (1965-V)0 index. The effective temperatures ...
  • Migration of solar polar crown filaments in the past 100 years 
    Xu, Yan; Banerjee, D; Chatterjee, Subhamoy; Potzi, Werner; Wang, Ziran; Ruan, Xindi; Jing, Ju; Wang, Haimin (IOP Publishing, 2021-03-01)
    Polar crown filaments (PCFs) are formed above the polarity inversion line, which separates unipolar polar fields and the nearest dispersed fields. They are important features in studying solar polar fields and their cyclical ...
  • Mildly Active Nuclei of Galaxies 
    Prabhu, T. P (Indian Academy of Sciences, 1985)
    Milder forms of activity in the nuclear regions of galaxies are reviewed. Three classes of activity are identified, namely starbursts, high-excitation emission-line and low-ionization emission-line nuclei. Sérsic perinuclear ...
  • The Milky Way Tomography with SDSS. III. Stellar Kinematics 
    Bond, N. A; Ivezić, Z; Sesar, B; Jurić, M; Munn, J. A; Kowalski, A; Loebman, S; Roškar, R; Beers, T. C; Dalcanton, J; Rockosi, C. M; Yanny, B; Newberg, H. J; Prieto, C. A; Wilhelm, R; Lee, Y. S; Sivarani, T; Majewski, S. R; Norris, J. E; Bailer-Jones, C. A. L; Fiorentin, P. R; Schlegel, D; Uomoto, A; Lupton, R. H; Knapp, G. R; Gunn, J. E; Covey, K. R; Smith, J. A; Miknaitis, G; Doi, M; Tanaka, M; Fukugita, M; Kent, S; Finkbeiner, D; Quinn, T. R; Hawley, S; Anderson, S; Kiuchi, F; Chen, A; Bushong, J; Sohi, H; Haggard, D; Kimball, A; McGurk, R; Barentine, J; Brewington, H; Harvanek, M; Kleinman, S; Krzesinski, J; Long, D; Nitta, A; Snedden, S; Lee, B; Pier, J. R; Harris, H; Brinkmann, J; Schneider, D. P (IOP Publishing, 2010-06-10)
    We study Milky Way kinematics using a sample of 18.8 million main-sequence stars with r < 20 and proper-motion measurements derived from Sloan Digital Sky Survey (SDSS) and POSS astrometry, including ~170,000 stars with ...
  • Milliarcsec-scale radio structure of a matched sample of Seyfert 1 and Seyfert 2 galaxies 
    Lal, D. V; Shastri, P; Gabuzda, D. C (EDP Sciences, 2004-10)
    We have obtained mas-scale resolution very long baseline interferometry (VLBI) images of a sample of Seyfert 1 and Seyfert 2 galaxies at 5 GHz (wavelength, lamda = 6 cm). The Seyferts of the two types were chosen to be ...
  • Millisecond pulsar emission altitude from relativistic phase shift: PSR J0437-4715 
    Gangadhara, R. T; Thomas, R. M. C (Springer Netherlands, 2008)
    We have analyzed the profile of the millisecond pulsar PSR J0437-4715 at 1440 MHz by fitting the Gaussians to pulse components, and identified its 11 emission components. We propose that they form a emission beam with 5 ...

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