IIAP Publications: Recent submissions

  • Modeling of polarization of radio pulsars 
    Gangadhara, R. T (Astronomical Society of the Pacific, 2009-09)
    We have generalized the coherent curvature radiation model to include the detailed geometry of the emission region in pulsar magnetosphere, and deduced the polarization state in terms the Stokes parameters. By considering ...
  • Circular polarization in pulsars due to curvature radiation 
    Gangadhara, R. T (Institute of Physics, 2010-02-10)
    The beamed radio emission from relativistic plasma (particles or bunches), constrained to move along the curved trajectories, occurs in the direction of velocity. We have generalized the coherent curvature radiation model ...
  • The Carter constant and Petrov classification of the Vaidya-Einstein-Kerr spacetime 
    Ramachandra, B. S (Springer, 2009-12)
    The existence of the Carter constant in the Vaidya–Einstein–Kerr (VEK) spacetime and its relation to the Petrov type is investigated. This spacetime is an example of a black hole in an asymptotically non-flat background. ...
  • Interplanetary magnetic field and equatorial ionosphere 
    Sastri, J. H (European Geophysical Society, 1980-06)
    Relationships between events in the interplanetary magnetic field and the equatorial ionosphere are investigated. Simultaneous data showing sudden northward transitions of the interplanetary magnetic field and nighttime ...
  • Relativistic coupled cluster (RCC) computation of the electric dipole moment enhancement factor of francium due to the violation of time reversal symmetry 
    Mukherjee, D; Sahoo, B. K; Nataraj, H. S; Das, B. P (American Chemical Society, 2009-11)
    A relativistic many-body theory for the electric dipole moment (EDM) of paramagnetic atoms arising from the electric dipole moment of the electron is presented and implemented. The relativistic coupled-cluster method with ...
  • Extrapolating SMBH correlations down the mass scale: the case for IMBHs in globular clusters 
    Safonova, M; Shastri, P (Springer, 2010-01)
    Empirical evidence for both stellar mass black holes (M (aEuro cent)< 10(2) M (aS (TM))) and supermassive black holes (SMBHs, M (aEuro cent)> 10(5) M (aS (TM))) is well established. Moreover, every galaxy with a bulge ...
  • Gamma-ray source observations with the HAGAR telescope system at Hanle in the Himalayas 
    Britto, R. J; Acharya, B. S; Chitnis, V. R; Cowsik, R; Dorji, N; Duhan, S. K; Gothe, K. S; Kamath, P. U; Mahesh, P. K; Nagesh, B. K; Naidu, A; Parmar, N. K; Prabhu, T. P; Rao, S. K; Saha, L; Saleem, F; Saxena, A. K; Sharma, S. K; Shukla, A; Singh, B. B; Srinivasan, R; Srinivasulu, G; Sudersanan, P. V; Tsewang, D; Upadhya, S. S; Vishwanath, P. R (Societe Francaise d’Astronomie et dAstrophysique, 2009-11)
    We have observed Crab nebula using the recently commissioned wavefront sampling high alti- tude (4270 m) array, HAGAR, at Hanle in the Ladakh region of the Himalayas. Regular source observations have begun with the ...
  • On the relationship between geomagnetic activity and spread-F configurations at Kodaikanal 
    Sastri, J. H; Sasidharan, K (European Geophysical Society, 1980-06)
    A study is made of the seasonal and sunspot cycle trends in the effect of geomagnetic activity on the nocturnal occurrence of spread-F configurations at Kodaikanal (Geo. Mag. Lat. 0.60 N, dip 3.50 N), using ionogram data ...
  • Onset of equatorial spread-f 
    Sastri, J. H; Murthy, B. S (European Geophysical Society, 1978)
  • Extreme-energy cosmic rays: hints to new physics beyond the standard model? 
    Bhattacharjee, P; Sigl, G (Springer, 2001)
    The observed extreme energy cosmic ray (EECR) events above 10(20) eV are difficult to explain within tile standard scenario of origin of cosmic rays in which charged particles are accelerated in magnetized shocks in powerful ...
  • High abnormal rotation rates of sunspots and flare productivity 
    Suryanarayana, G. S (Elsevier, 2010-03)
    Solar activity, such as flares and CMEs, affect the interplanetary medium, and Earth’s atmosphere. Therefore, to understand the Space Weather, we need to understand the mechanisms of solar activity. Towards this end, we ...
  • Solar cycle variations of coronal neutral lines and polar regions activity 
    Makarov, V. I; Makarova, V. V; Koutchmy, S; Sivaraman, K. R (National Solar Observatory, 1988-07)
  • The development of technology for vacuum ultraviolet plane grating monochromator to be used with XUV synchrotron source of INDUS I 
    Saxena, A. K; Cowsik, R (SPIE The International Society for Optical Engineering., 1997)
    The plane grating monochromator is to be used with the 480MeV (lambda(c)=61 Angstrom) consists of a, plane grating, plane minor (500mmx50mm) and an ellipsoidal mirror (300mmx50mm, & semi-major axis 39935.7mm, semi-minor ...
  • 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 ...
  • Production of the active galactic nuclei continuum via coherent plasma processes 
    Krishan, V (Cambridge University Press, 1988)
    It appears possible to explain both the typical continuum electromagnetic spectrum and the relativistic velocities of electrons in the region of an active galactic nucleus (AGN) around a supermassive black hole (SMBH) by ...
  • A fresh look at the seismic spectrum of HD49933: analysis of 180 days of CoRoT photometry 
    Benomar, O; Baudin, F; Campante, T. L; Chaplin, W. J; García, R. A; Gaulme, P; Toutain, T; Verner, G. A; Appourchaux, T; Ballot, J; Barban, C; Elsworth, Y; Mathur, S; Mosser, B; Régulo, C; Roxburgh, I. W; Auvergne, M; Baglin, A; Catala, C; Michel, E; Samadi, R (EDP Sciences, 2009-11)
    Context. Solar-like oscillations have now been observed in several stars, thanks to ground-based spectroscopic observations and space-borne photometry. CoRoT, which has been in orbit since December 2006, has observed the ...
  • Long-term variations in the mean meridional motion of the sunspot groups 
    Javaraiah, J (EDP Sciences, 2010-01)
    Aims. We seek the long-term variations close to the length of a solar cycle in the mean meridional motion of sunspot groups (a proxy of the meridional plasma flow). Methods. Using the largest set of available reliable ...
  • Recovery of quiescent novae 
    Kamath, U. S (Astronomical Society of the Pacific, 2009)
    An observational program of recovery and study of quiescent novae is being carried out at the 2m Himalayan Chandra Telescope (HCT) of the Indian Institute of Astrophysics (IIA) since 2004. Some results from this survey are ...
  • A Turbulent model of the solar granulation 
    Krishan, V (World Scientific Publishing Company, 1995)
    The turbulent nature of the motions on the solar photosphere is being emphasized more and more by the high resolution quality observations. The processes of inverse cascade of energy in a turbulent medium are being ...
  • Equatorial irregularity belt and its movement during a magnetic storm 
    Vats, H. O; Chandra, H; Deshpande, M. R; Rastogi, R. G; Murthy, B. S; Janve, A. V; Rai, R. K; Singh, M; Gurm, H. S; Jain, A. R (Nature Publishing Group, 1978-03)
    GEOSTATIONARY satellites are able to monitor amplitude, phase, plane of polarisation (Faraday rotation) and group retardation of radio waves passing through the ionosphere with improved temporal resolution, although some ...

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