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Browsing by Author "Krishan, V"

Browsing by Author "Krishan, V"

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  • Absorption bursts in the radio emission from the sun at decameter wavelengths 
    Sastry, Ch. V; Subramanian, K. R; Krishan, V (Gordon and Breach Science Publishers, 1983)
    Some characteristics of sudden decreases in the observed radio emission from the sun at decameter wavelengths are presented, and possible interpretations are discussed. These 'absorption bursts' occurred during periods of ...
  • Absorption of Electromagnetic Waves in Astrophysical Plasmas 
    Gangadhara, R. T; Krishan, V (International Astronomical Union, 1990)
    We study parametric Decay Instabilities (PDI) using the kinetic description, in the homogeneous and unmagnetic plasmas. These instabilities cause anomalous absorption of the incident electromagnetic (e.m) radiations. The ...
  • Absorption of intense electromagnetic beams in a magnetoplasma 
    Gopalswamy, N; Krishan, V (Kluwer Academic Publishers, 1980-11)
    The multiphoton inverse bremsstrahlung absorption of two intense electromagnetic beams passing through a magnetized plasma is studied. The rate of absorption of electromagnetic energy by the electrons is calculated by ...
  • Absorption of radiation in the emission line regions 
    Krishan, V (Cambridge University Press, 1988)
    Inverse bremsstrahlung or the free-free absorption is believed to be the main mechanism of absorption of the nonthermal quasar radiation in the emission line regions. The absorption rate is found to change significantly ...
  • Acceleration and radiation processes around active galactic nuclei 
    Krishan, V (D. Reidel Publishing Co., 1985-10)
    It is proposed that the region containing fast particles, electrostatic and electromagnetic fields, around active galactic nuclei is responsible for generating electromagnetic emissions from γ-rays to radio waves. The ...
  • Acceleration of cometary plasma tails 
    Kundt, W; Krishan, V (Kluwer Academic Publishers, 1988-04)
    Cometary plasma tails are accelerated by the solar wind to ≈ half its velocity, corresponding to some 10/sup2 times the solar-wind momentum density. The authors corroborate Alfvén's (1957) "wind-sock" mechanism according ...
  • Activity dependence of solar supergranular fractal dimension 
    Paniveni, U; Krishan, V; Singh, J; Srikanth, R (Blackwell Publishing, 2010-02)
    We study the complexity of supergranular cells using the intensity patterns obtained at the Kodaikanal Solar Observatory during the solar maximum. Our data consist of visually identified supergranular cells, from which a ...
  • Alfvén vortices in nonuniform dusty magnetoplasmas 
    Shukla, P. K; Varma, R. K; Krishan, V; Mckenzie, J. F (The American Physical Society, 1993-01)
    The Alfvén waves are shown to be linearly coupled with finite-frequency convective cell modes in a nonuniform cold dusty magnetoplasma. The dynamics of weakly interacting finite-amplitude electromagnetic oscillations is ...
  • Alfvén-like mode in partially ionized solar atmosphere 
    Singh, K. A. P; Krishan, V (Elsevier, 2010-01)
    The partially ionized part of the solar atmosphere is investigated within the framework of a single-fluid magnetohydrodynamic (MHD) description including the non-ideal effects such as the Hall effect and the ambipolar ...
  • Alpha effect in partially ionized plasmas 
    Krishan, V; Gangadhara, R. T (Springer Netherlands, 2008)
    There are several astrophysical situations where one needs to study the dynamics of magnetic flux in partially ionized turbulent plasmas. In a partially ionized plasma the magnetic induction is subjected to the ambipolar ...
  • Ambipolar diffusion in the solar atmosphere 
    Chitre, S. M; Krishan, V (Royal Astronomical Society, 2001-05)
    The process of non-linear ambipolar diffusion in the region overlying the solar surface can be an effective mechanism for producing sharp magnetic structures and current sheets. These may be the sites responsible for the ...
  • Anomalous heating of quasar emission-line regions 
    Krishan, V (Royal Astronomical Society, 1987-06)
    It is shown that the non-thermal radio radiation from a quasar is intense enough to drive parametric instabilities in the fully ionized emission-line regions. These instabilities cause significant enhancement of the plasma ...
  • Astrophysical consequences of n-nmacr oscillations - (Reply) 
    Sivaram, C; Krishan, V (Nature Publishing Group, 1984-06)
  • Astrophysical consequences of neutron-antineutron oscillations 
    Krishan, V; Sivaram, C (Springer, 1982-10)
    Grand unified theories predict baryon number violating interactions and one of the implications of this is the possible existence of neutron-antineutron oscillations. The neutron-antineutron oscillations have been considered ...
  • Astrophysical plasmas and fluids 
    Krishan, V (Kluwer Academic Publishers, 1999)
    Life was simple when the dynamic, the spectral and the resolving powers of our instruments were small. One observed whole objects - planets, stars, sunspots, galaxies, often in rainbow colours. Then the revolution occurred: ...
  • Centrifugal acceleration of plasma in pulsar magnetosphere 
    Gangadhara, R. T; Krishan, V (Indian Academy of Sciences, 2003-12)
    We present a relativistic model for the centrifugal acceleration of plasma bunches and the coherent radio emission in pulsar magnetosphere. We find that rotation broadens the width of leading component compared to the width ...
  • Characteristics of synchrotron Čerenkov radiation 
    Pratap, R; Sasidharan, K; Krishan, V (The American physical Society, 1993-01)
    A diagrammatic technique has been worked out in the framework of nonequilibrium statistical mechanics as developed by Prigogine and co-workers to tackle the problem of radiation emission from a relativistic electron in an ...
  • Characterization of solar multi-scaling magnetic loop interactions 
    Rosa, R. K; Karlicky, M; Zanandrea, A; Sych, R. A; Hanumant, S. S; Krishan, V (American Institute of Physics, 2005-09)
    Solar magnetic loop structures can exist in a broad range of spatio-temporal scales and their mutual interactions are described by nonlinear processes of magnetic reconnection triggered as a secondary regime by a primary ...
  • Clustering of galaxies by inverse cascade in a turbulent medium 
    Krishan, V; Sivaram, C (Royal Astronomical Society, 1991-05)
    A definite physical mechanism based in inverse cascading is suggested which quite naturally yields a bottom-up hierarchical structure for galactic clustering. In this mechanism, nonlinear interactions between small fluid ...
  • Clustering of Galaxies by the Alpha-Effect 
    Krishan, V (Royal Astronomical Society, 1993-09-01)
    The development of large-scale flows from the stresses generated by small-scale flows in a Navier-Stokes system is studied in order to model the large-scale structure of the Universe. This process is an analogue of the ...

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