IIA Institutional Repository

Browsing by Author "Krishan, V"

Browsing by Author "Krishan, V"

Sort by: Order: Results:

  • Coherent Plasma Processes and the Continuum Emission in Active Galactic Nuclei 
    Krishan, V; Wiita, P. J (Royal Astronomical Society, 1990-10)
    Stimulated Raman scattering processes appear to be able to produce the typical electromagnetic continuum of an active galactic nucleus (AGN). Seed photons beat through Raman forward-scattering to create Langmuir plasma ...
  • Collective acceleration in solar flares 
    Barletta, W; Gershtein, S. S; Krishan, V; Reiser, M; Sessler, A. M; Xie, M (The Royal Swedish Academy of Sciences, 1994)
    Solar flare data are examined with an eye to seeing if they suggest collective acceleration of ions. That, in fact, seems to be the case. The collective acceleration mechanism of Gershtein is reviewed and the possibilities ...
  • Comment on Two-Dimensional Steady-State Pressure Structure in a Coronal Loop 
    Krishan, V (Kluwer Academic Publishers, 1991-07)
  • Compton cross sections in highly dense plasmas 
    Krishan, V (Astronomical Society of India, 2002)
    The properties of the electromagnetic radiation undergo a fundamental change in the presence of a medium in general and a plasma in particular. Specially the dispersion relation is modified in a way that in a plasma, the ...
  • Compton Scattering, Pair Annihilation, and Pair Production in a Plasma 
    Krishan, V (International Astronomical Union, 2000)
    The square of the four-momentum of a photon in vacuum is zero. However, in an unmagnetized plasma, it is equal to the square of the plasma frequency. Further, the electron-photon coupling vertex is modified in a plasma to ...
  • Conductivity of an ion-acoustically turbulent plasma 
    Krishan, V (D.Reidel Publishing Co.,, 1978-09)
    Three different mechanisms are suggested for the non-linear saturation of the ion-acoustic instability. These include the indirect wave-particle interaction, the scattering on density fluctuations and the effects of energy ...
  • Continuum radiation due to collective plasma process in quasars 
    Gangadhara, R. T; Krishan, V (Indian Association for the Cultivation of Science, 1992)
  • Contribution of turbulence to Tully-Fisher relation 
    Prabhu, R. D; Krishan, V (Astronomical Society of India, 1996)
    We have proposed a model for the flat rotaion curves of spiral galaxies in an earlier paper of ours (Prabhu & Krishan 1994). We could resolve the galactic velocity field for the outer regions into a turbulent and a gravity ...
  • Coronal Loops 
    Krishan, V (Indian Institute of Astrophysics, Bangalore, 1986)
    The statistical treatment of the magnetohydrodynamically turbulent plasma is used to study the steady state configuration of the coronal loops. The stability of the plasma system is defined in terms of certain invariants ...
  • Curiosity, ambition and foolhardiness 
    Krishan, V (Indian Academy of Sciences, 2008)
  • Cylindrical Hall – MHD Waves: A Nonlinear Solution 
    Krishan, V; Varghese, B. A (Springer Netherlands, 2008-01)
    The exact nonlinear cylindrical solution for incompressible Hall – magnetohydrodynamic (HMHD) waves, including dissipation, essentially from electron – neutral collisions, is obtained in a uniformly rotating, weakly ionized ...
  • 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 ...

Search DSpace

Browse

My Account