IIAP Publications: Recent submissions

  • The far-infrared (IRAS) excess in luminous F-G stars 
    Pottasch, S. R; Parthasarathy, M (European Southern Observatory, 1988-03)
    The far-infrared IRAS excesses are found in ten luminous F-G stars. The far-IR fluxes from these stars are due to large amounts of dust around them. The far-IR flux distribution, far-IR luminosities and dust masses are ...
  • Geomagnetic disturbances associated with disappearing solar filaments 
    Sastri, J. H; Ramesh, K. B; Rao, J. V. S. V (Springer, 1985-07)
    To gain insight into the origin of enhanced geomagnetic activity that is recently reported to follow the 'disparition brusque' (DB) of quiescent solar filaments, a study is made of the interplanetary plasma and magnetic ...
  • Polarimetric observations of the RV Tauri star AR Puppis 
    Raveendran, A. V; Kameswara Rao, N (European Southern Observatory, 1988-03)
    UBVRI polarimetry of AR Pup is presented. Large variations are seen both in the amount and direction of polarization. On one occasion, the polarization in U was found to be as high as 14.6 percent. Polarization level ...
  • Manifestations of short-period electric field fluctuations in the equatorial lower thermosphere 
    Sastri, J. H; Ramesh, K. B; Rao, J. V. S. V; Rao, D. R. K (The Royal Swedish Academy of Sciences, 1988-03)
    Measurements (90h) of phase path, P of lower F-region (~ 200km) reflections at normal incidence over Kodaikanal (dip 3.0°N) revealed the time rate of change of phase path, (Doppler frequency shift, Δf) to undergo ...
  • Solar wind flow associated with stream-free sector boundaries at 1 AU 
    Sastri, J. H (Kluwer Academic Publishers, 1987-09)
    The correlations between the plasma characteristics of the solar wind flow in the vicinity (± 12 hr) of stream-free sector boundaries near Earth are examined using the composite data base of interplanetary plasma for the ...
  • Reappraisal of cis effect in 1,2-dihaloethenes: An improved virtual orbital multireference approach 
    Chaudhuri, R. K; Hammond, J. R; Freed, K. F; Chattopadhyay, S; Mahapatra, U. S (American Institute of Physics, 2008-08)
    Computed relative stabilities for isomers of 1,2-difluoroethene and 1,2-dichloroethene isomers are compared with predictions based on chemical hardness (η) and electrophilicity (ш) using the principles of maximum hardness ...
  • Transition probability parameters for the band systems G, H and I-B of astrophysical molecule PO 
    Rajamanickam, N; Balachandra Kumar, K; Shanmugavel, R; Sriramachandran, P; Nagarajan, K; Bagare, S. P (Springer, 2003-06)
    The transition probability parameters, Franck - Condon factors and r-centroids, have been evaluated by the more reliable numerical integration procedure for the bands of G, H and I-B systems of astrophysical molecule PO, ...
  • 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, ...
  • Photometry and low resolution spectroscopy of hot post-AGB candidates 
    Gauba, G; Parthasarathy, M; Kumar, B; Yadav, R. K. S; Sagar, R (The European Southern Observatory, 2003-06)
    We have obtained Johnson U, B, V and Cousins R, I photometry and low resolution spectra of a small sample of hot post-AGB candidates. Using the present data in combination with JHK data from 2MASS, infrared data from the ...
  • Variations in Oscillation Frequencies From Minimum to Maximum of Solar Activity 
    Jain, K; Bhatnagar, A (Springer, 2003-04)
    The temporal variation in intermediate-degree-mode frequencies is analysed using helioseismic data which cover the minimum to the maximum phase of the current solar cycle. To study the variation in detail, the measured ...
  • Light-induced absorption in photorefractive BaTiO3 crystals 
    Banyal, R. K; Prasad, B. R (American Institute of Physics, 2003-06-15)
    We present the experimental results on the measurement of temporal and steady-state light-induced absorption change in undoped and rhodium-doped barium titanate (Rh:BaTiO3) crystals at different wavelengths and intensities. ...
  • Squeezing of a coupled state of two spinors 
    Devi, A. R. U; Mallesh, K. S; Sbaih, M. A. A; Nalini, K. B; Ramachandran, G (Institute of Physics Publishing Ltd., 2003-05-16)
    The notion of spin squeezing involves a reduction in the uncertainty of a component of the spin vector vecS below a certain limit. This aspect has been studied earlier (Mallesh et al 2000a <A article="0305-4470/33/4/310">J. ...
  • What is Special About the Planck Mass? 
    Sivaram, C (South Asian Publishers Pvt Ltd, 2008-06)
    Planck introduced his famous units of mass, length and time a hundred years ago. The many interesting facets of the Planck mass and length are explored. The Planck mass ubiquitously occurs in astrophysics, cosmology, quantum ...
  • Measurement of Kodaikanal white-light images - VI. Variation of Rotation Rate with Age of Sunspot Groups 
    Sivaraman, K. R; Sivaraman, H; Gupta, S. S; Howard, R. F (Springer, 2003-05)
    We find from an analysis of the Kodaikanal sunspot group data that the rotation rates of spot groups increase with their age when the rotation rates are computed after sorting the spot groups life-span-wise. We confirm ...
  • Global magnetospheric-ionospheric oscillations initiated by a solar wind pressure impulse 
    Huang, C. S; Foster, J. C; Reeves, G. D; Watermann, J; Sastri, J. H; Yumoto, K; Song, P (American Geophysical Union, 2003-06-10)
    We present simultaneous observations of long-period (~1 hour) global magnetospheric-ionospheric oscillations with multiple spacecraft and ground-based instruments. These oscillations occurred following a major increase in ...
  • Duration of Polar Activity Cycles and Their Relation to Sunspot Activity 
    Makarov, V. I; Tlatov, A. G; Sivaraman, K. R (Springer, 2003-05)
    We have defined the duration of polar magnetic activity as the time interval between two successive polar reversals. The epochs of the polarity reversals of the magnetic field at the poles of the Sun have been determined ...
  • When does the polar activity cycle start? 
    Makarov, V. I; Tlatov, A. G; Sivaraman, K. R (WILEY-VCH Verlag GmbH & Co., 2003-05)
  • Photon polarization in np fusion 
    Ramachandran, G; Deepak, P. N; Kumar, S. P (Institute of Physics Publishing Ltd., 2003-06)
    A model-independent irreducible tensor formalism is developed to discuss photon polarization in np fusion. It is shown that photon polarization arising out of the interference of the dominant isovector M1 amplitude at ...
  • The relaxation time in spherical galaxy simulations 
    Namboodiri, P. M. S (International Astronomical Union, 2003)
    The relaxation time of a spherical galaxy with various density distributions has been evaluated using numerical simulations. The results indicate that the relaxation time is weakly dependent on the density of the galaxies ...
  • Influence of correlation effects on the magnetic dipole hyperfine interaction in the low-lying states of Ca+ 
    Sahoo, B. K; Chaudhuri, R. K; Das, B. P; Majumder, S; Merlitz, H; Mahapatra, U. S; Mukherjee, D (Institute of Physics Publishing Ltd., 2003-05-28)
    The relativistic coupled cluster theory is employed to calculate the hyperfine structure of the 2S 1/2, 2P 1/2, 2P 3/2, 2D 3/2 and 2D 5/2 states of singly ionized calcium. The importance of correlation effects is highlighted. ...

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