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Browsing by Author "Krishan, V"

Browsing by Author "Krishan, V"

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  • Description of accretion induced outflows from ultra-luminous sources to under-luminous AGNs 
    Ghosh, Shubhrangshu; Mukhopadhyay, Banibrata; Krishan, V; Khan, Manoranjan (Elsevier, 2010-01)
    We study the energetics of the accretion-induced outflow and then plausible jet around black holes/compact objects using a newly developed disc-outflow coupled model. Inter-connecting dynamics of outflow and accretion ...
  • Detection of Short-Period Coronal Oscillations during the Total Solar Eclipse of 24 October, 1995 
    Singh, J; Cowsik, R; Raveendran, A. V; Bagare, S. P; Saxena, A. K; Sundararaman, K; Krishan, V; Naidu, N; Samson, J. P. A; Gabriel, F (Springer, 1997-02)
    An experiment to search for short-period oscillations in the solar corona was conducted during the total solar eclipse of 1995 October 24 at Kalpi, India. The intensity in the continuum, centred around 5500 Å and with a ...
  • Different representations of a partially ionized plasma 
    Krishan, V (Indian Academy of Sciences, 2022-12)
    It is economical to devise ways and means to simplify a multi-species particle system. A partially ionized plasma consisting of electrons, ions and neutral particles can be described as a three-fluid, a two-fluid or a ...
  • Direct generation of electromagnetic radiation from a beam-plasma system 
    Krishan, V (Institute of Physics, 1980-02)
    A possible mechanism for the direct generation of electromagnetic modes of frequencies near the electron plasma frequency, is suggested. The spatial variation of the interplanetary magnetic field seems to play an essential ...
  • Do Flat Rotation Curves Include Non-Keplerian Motions? 
    Krishan, V (Astronomical Society of India, 1997)
    In an earlier paper (Prabhu and Krishan 1994) a model of the flat rotation curves of galaxies has been given. This model attempts to explain the rotation curves without invoking dark matter, instead it depends on certain ...
  • Dust-Alfvenic Shocklets in Dusty Plasmas 
    Shukla, P. K; Morfill, G. E; Krishan, V (IOP Publishing, 2004)
    We show that the Hall dust magnetohydrodynamic equations admit a non-stationary dust-Alfvénic shock solution in dusty plasmas. The dust-Alfvénic shocklet (DAS) occurs on a long temporal (dust gyroperiod) and spatial (dust ...
  • Dynamics of magnetic and velocity fields in coronal loops 
    Krishan, V; Berger, M; Priest, E. R (National Solar Observatory, 1988-07)
    The coronal loop plasma is represented by a superposition of the three lowest order Chandrasekhar-Kendall modes. The temporal evolution of the velocity and magnetic field in each of these mode is determined using ideal MHD ...
  • Effect of beam-plasma instabilities on accretion disk flares 
    Krishan, V; Wiita, P. J; Ramadurai, S (European Southern Observatory, 2000-04)
    We show that a certain class of flare models for variability from accretion disk coronae are subject to beam-plasma instabilities. These instabilities can prevent significant direct acceleration and greatly reduce the ...
  • Effect of radiative cooling on collapsing charged grains 
    Pandey, B. P; Krishan, V; Roy, M (Indian Academy of Sciences, 2001-01)
    The effect of the radiative cooling of electrons on the gravitational collapse of cold dust grains with fluctuating electric charge is investigated. We find that the radiative cooling as well as the charge fluctuations, ...
  • Effect of radiative cooling on molecular cloud collapse 
    Pandey, B. P; Krishan, V (IEEE-Institute of Electrical and Electronics Engineers, 2001-04)
    The effect of the radiative cooling of electrons on the gravitational collapse of molecular clouds consisting of neutral particles along with electrons, ions, and electrically charged dust grains with fluctuating charge ...
  • Electromagnetic radiation in a helical magnetic field 
    Krishan, V (1984)
    Electromagnetic radiation spectrum is studied in a helical magnetic field since such magnetic field configurations may be present in cosmic objects. It is shown that, by a proper choice of the spatial period of the magnetic ...
  • Electrostatic oscillations in the presence of grain-charge perturbations in dusty plasmas 
    Varma, R. K; Shukla, P. K; Krishan, V (The American Physical Society, 1993-05)
    The properties of electrostatic oscillations and instability phenomena are studied, accounting for the time-dependent variation of the grain electric charge due to wave motions in an unmagnetized dusty plasma. It is found ...
  • Emission mechanism of extragalactic X-ray and radio sources 
    Krishan, V (Gordon and Breach Science Publishers, 1983)
    An alternative way of looking at the process of comptonization and the roles of the microwave background radiation density and of the ambient magnetic field in the generation of X-rays on the galactic scale is suggested. ...
  • Equilibrium structures in partially ionized rotating plasmas within Hall magnetohydrodynamics 
    Krishan, V; Yoshida, Z (American Institute of Physics, 2006-09)
    The formation of equilibrium structures in partially ionized rotating plasmas, consisting of electrons, ions, and neutral molecules, including the Hall effect, is studied in order to diagnose the possible velocity and the ...
  • Evidence of Plasma Resonance Instability from Observations of Solar Decimetric Fine Structures 
    Fernandes, F. C. R; Sawant, H. S; Cecatto, J. R; Krishan, V; Karlicky, M; Rosa, R. R (Sociedade Brasileira de Física, 2003-03)
    The solar radio emissions in the decimetric frequency range (above 1000 MHz) are very rich in temporal and/or spectral fine structures. The Brazilian Solar Spectroscope (BSS) at INPE started operating in 1998. Since then, ...
  • Exact nonlinear solution for the Hall Alfvén wave in partially ionized plasmas 
    Krishan, V; Furukawa, M; Mahajan, S. M (Cambridge University Press, 2006-12)
    It is shown that the exact nonlinear solution for the Hall–Alfvén waves can be obtained in a uniformly rotating weakly ionized plasma such as those which exist in various types of accretion disks. In addition this piece ...
  • Exact solution of the incompressible Hall magnetohydrodynamics 
    Mahajan, S. M; Krishan, V (Royal Astronomical Society, 2005-05)
    The Alfvén wave is known to be an exact solution of the ideal magnetohydrodynamics (MHD), and this has found use in modelling astrophysical turbulence. In this paper we show that the Hall MHD also submits itself to an exact ...
  • Excitation of high-m tearing modes at the solar flare site 
    Krishan, V (D. Reidel Publishing Company, 1982-10)
    It is shown that high-m drift tearing modes can be excited under the conditions prevalent at the solar flare sites. Since the growth rate of the high-m tearing modes is larger than that for low-m macroscopic tearing modes ...
  • The extraterrestrial Raman-scattering 
    Krishan, V (Indian Academy of Sciences, 1993-03-10)
    The diagnostic potential of the Raman scattering of the electro-magnetic radiation has been realized in an all embracing manner in terrestrial phenomena. Our knowledge of the remote reaches of the universe comes almost ...
  • Faraday rotation versus stimulated Raman scattering in intense sources 
    Gangadhara, R. T; Krishan, V (Astronomical Society of India, 1993)
    A coherent plasma process such as the stimulated Raman scattering plays significant role in bringing about the changes in polarization characteristics of radiation. It is found that some of the observed polarization ...

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