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Browsing by Author "Satya Narayanan, A"

Browsing by Author "Satya Narayanan, A"

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  • Interfacial hydromagnetic waves with shear and inclined magnetic fields 
    Satya Narayanan, A; Ramesh, R (Astronomical Society of India, 2002-09)
    The combined effect of non-parallel propagation, steady :flow and inclined magnetic field on the . propagation characteristics of hydromagnetic surface waves is examined. The fluid is assumed to be perfectly conducting ...
  • An introduction to waves and oscillations in the Sun 
    Satya Narayanan, A (Springer, 2013)
    Astrophysicists and others studying the Sun will find this expansive coverage of what we know about waves and oscillations in our nearest star an informative introduction to a hot contemporary topic. After a section ...
  • Kink oscillations in the solar corona 
    Satya Narayanan, A; Ramesh, R; Kathiravan, C; Ebenezer, E (Astronomical Society of the Pacific, 2004-12)
    The solar coronal plasma is highly structured in the magnetic field, density and temperature. This plays a crucial role in the theory of MHD oscillations. In this study, we model a coronal loop to be made up of a cylindrical ...
  • Low-frequency Observations of Polarized Emission from Long-lived Non-thermal Radio Sources in the Solar Corona 
    Ramesh, R; Kathiravan, C; Satya Narayanan, A (IOP Publishing, 2011-06-10)
    We report observations of circularly polarized emission from the solar corona at 77 MHz during the periods 2006 August 11-18, 2006 August 23-29, and 2007 May 16-22 in the minimum phase between the sunspot cycles 23 and 24. ...
  • Low-frequency radio observations of picoflare category energy releases in the solar atmosphere 
    Ramesh, R; Sasikumar Raja, K; Kathiravan, C; Satya Narayanan, A (IOP Publishing, 2013-01-10)
    We report low-frequency (80 MHz) radio observations of circularly polarized non-thermal type I radio bursts ("noise storms") in the solar corona whose estimated energy is ~1021 erg. These are the weakest energy release ...
  • Magnetoacoustic gravity surface waves with flows 
    Satya Narayanan, A (Astronomical Society of India, 2000)
    The effect of uniform flows on the characteristics of magneto acoustic-gravity surface waves at a single interface when both the magnetic field and the propagation vector are parallel to each other is studied. The region ...
  • Magnetohydrodynamic waves in the solar corona 
    Satya Narayanan, A; Ramesh, R (Anita Publications, 2005)
  • Metric observations of transient, quasi-periodic radio emission from the solar corona in association with a ``halo'' CME and an ``EIT wave'' event 
    Ramesh, R; Kathiravan, C; Satya Narayanan, A; Ebenezer, E (The European Southern Observatory, 2003-03)
    We present metric radio observations of quasi-periodic emission from the solar corona in close association with a ``halo'' CME and an ``EIT wave'' phenomenon. The radio event lasted for about 60 s. Its mean periodicity was ...
  • 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 ...
  • Non-parallel propagation of hydromagnetic surface waves in the presence of steady shear-flows 
    Joarder, P. S; Satya Narayanan, A (European Southern Observatory, 2000-07)
    The combined effect of non-parallel propagation and steady shear-flows on the properties of hydromagnetic surface waves is examined for two different orderings of physical parameters that are expected at the edge of a hot ...
  • Non-radial Oscillations in an Axisymmetric MHD Incompressible Fluid 
    Satya Narayanan, A (Indian Academy of Sciences, 2000-12)
    It is well known from Helioseismology that the Sun exhibits oscillations on a global scale, most of which are non_radial in nature. These oscillations help us to get a clear picture of the internal structure of the Sun as ...
  • On structure formation in the universe 
    Satya Narayanan, A (Springer, 1994-12)
    The formation of structures in the universe is one of the most challenging problems of cosmology. In this paper, an attempt to explain the formation of galaxies through the generation of vortices (with dissipation) in an ...
  • On the existence of interfacial waves with inclined magnetic fields 
    Satya Narayanan, A (European Southern Observatory, 1997-08)
    The dispersive characteristics of interfacial waves in low β plasma is studied. The condition for the existence of these waves is derived. It is assumed that the magnetic field and the propagation vector are inclined at ...
  • On the Rate of Change of Period for Accelerated Motion and Their Implications in Astrophysics 
    Rajamohan, R; Satya Narayanan, A (Progress in Physics, 2007-04)
    We have derived in this paper, the relationship that needs to be satisfied when length measurements are expressed in two different units. Interesting relationships emerge when the smaller of the two units chosen is a ...
  • Period-brightness relationship in chromospheric bright points 
    Kariyappa, R; Satya Narayanan, A; Dame, L (Astronomical Society of India, 2005-03)
    Chromospheric bright points are sites where intense heating takes place by 3-min period waves. A 35-min-long time series of photographic spectra obtained in CaII H-line on a quiet region at the center of the solar disk ...
  • Pressure structure of solar coronal loops. III 
    Sreedharan, T. D; Sasidharan, K; Satya Narayanan, A; Krishan, V (Springer Netherlands, 1992-12)
    The theory of ideal magnetohydrodynamic turbulence in cylindrical geometry is used to study the steady-state structure of a coronal loop. The pressure profile is derived from MHD equations by representing the velocity and ...
  • Rotating light house effect 
    Rajamohan, R; Satya Narayanan, A (Global Journals Inc., 2013-07)
    We clarify as to how a precession period appears in the analysis of periodic phenomenon in Astrophysics. The observed redshift that is related to this phenomenon is shown to be 2a/V = 2 / T, where ‘a’ is the relative ...
  • Seismology of the solar corona through observations of metric type IV radio burst emission 
    Ramesh, R; Kathiravan, C; Satya Narayanan, A (Anita Publications, 2004)
    We present metric radio observation of a transient. quasi-periodic type IV burst emission from the solar corona following the hard X-ray/H¦Á flare of November 23, 2000. The radio event lasted for about 121s, and the ...
  • Self organization in quasi two-dimensional hydrodynamic flows 
    Satya Narayanan, A (The Royal Swedish Academy of Sciences, 1993-06)
    The cascading characteristics of the invariants of 2D and 3D hydrodynamically turbulent media are well known. Analogous to the 2D case, here we set up a variational principle for the 3D case by invoking the differential ...
  • A simple model for coronal loops and their stability 
    Satya Narayanan, A (European Space Agency, 1999-12)

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