IIAP Publications: Recent submissions

  • Stigmatic mounting of holographic plane grating 
    Singh, M (Tipografia Baccini and Chiappi, 1977-10)
    A Stigmatic mounting of holographic plane has been proposed and its properties have been studied theoretically. In this mounting the observation is to be made about a normal direction and different regions of the spectrum ...
  • 100 years of photon-counting: the quest for the perfect eye 
    Morel, S; Saha, S. K (Anita Publications, 2005)
  • Comparative studies of dipole polarizabilities in Sr+ , Ba+ , and Ra+ and their applications to optical clocks 
    Sahoo, B. K; Timmermans, R. G. E; Das, B. P; Mukherjee, D (The American Physical Society, 2009-12)
    Static dipole polarizabilities are calculated in the ground and metastable states of Sr+, Ba+ and Ra+ using the relativistic coupled-cluster method. Trends of the electron correlation effects are investigated in these ...
  • The chemical composition and circumstellar environment of the variable star QY sge 
    Goswami, A; Kameswara Rao, N; Lambert, D. L (Astronomical Society of the Pacific, 2004)
    Chemical composition studies of the variable star QY Sge show abundance anomalies suggestive of the pattern exhibited by the warmer RV Tau variables. Abundance analysis indicates a near-solar atmosphere with highly condensable ...
  • Magnetic field induced metal-insulator transition in a one-dimensional chain: application to neutron star atmospheres 
    Chatterjee, S (Kluwer Academic Publishers, 1989-12)
    It is shown that, in the non-interacting limit, a one-dimensional metallic system has a transition to an insulating phase, in presence of external magnetic field H, if mu(B)H is greater than E(B), where mu(B) is the Bohr ...
  • Prolonged intranight optical quiescence of the classical BL Lac object PKS 0735+178 
    Goyal, A; Gopal-Krishna; Anupama, G. C; Sahu, D. K; Sagar, R; Britzen, S; Karazous, M; Aller, M. F; Aller, H. D (Astronomical Society of the Pacific, 2009-09)
    We report our extensive intranight optical monitoring of the well known low-energy peaked (LBL) BL Lac object PKS 0735+178. This long-term follow-up consists of R-band monitoring for a minimum duration of ˜ 4 hours, on 17 ...
  • Optical variability of radio-intermediate quasars 
    Goyal, Arti; Gopal-Krishna; Joshi, S; Sagar, R; Wiita, Paul J; Anupama, G. C; Sahu, D. K (Blackwell Publishing, 2010-02)
    We report the results of our intensive intranight optical monitoring of eight optically bright `radio-intermediate quasars' (RIQs) having flat or inverted radio spectra. The monitoring was carried out in R band on 25 nights ...
  • Daytime satellite radio scintillation and sporadic E near the magnetic equator 
    Rastogi, R. G; Deshpande, M. R; Murthy, B. S; Davies, K (American Geophysical Union, 1977-03)
    An investigation is conducted concerning the association between the daytime scintillations of ATS-6 signals received at Ootacamund and the ionograms at the nearby station Kodaikanal, India. The investigation shows that ...
  • On the effective temperature of sunspot umbrae using beryllium hydride isotopomer lines 
    Sangeetha, R; Sriramachandran, P; Bagare, S. P; Rajamanickam, N; Shanmugavel, R (Astronomical Observatory, Serbia, 2009-12)
    A search for fourteen bands of the visible and infrared systems of the beryllium hydride isotopomers, in addition to the previously identified bands A - X(0, 0; 1, 1; 2, 2) for BeH, A - X(0, 0; 1, 1; 2, 2) for BeD and A - ...
  • Identification of SrF molecular lines in the spectrum of sunspot umbra 
    Sriramachandran, P; Shanmugavel, R; Bagare, S. P; Rajamanickam, N (Springer, 2009-09)
    A high resolution spectrum of a sunspot umbra is used for identification of rotational lines due to (0, 0) band of the A 2Π–X 2Σ+ system and (0, 0), (1, 1), and (2, 2) bands of the B 2Σ+–X 2Σ+ system of the molecule ...
  • Projection methods for line radiative transfer in spherical media 
    Anusha, L. S; Nagendra, K. N (Societa Astronomica Italiana, 2009)
    An efficient numerical method called the Preconditioned Bi-Conjugate Gradient (Pre-BiCG) method is presented for the solution of radiative transfer equation in spherical geometry. A variant of this method called Stabilized ...
  • Optical identification of XMM sources in the Canada-France-Hawaii telescope legacy survey 
    Stalin, C. S; Petitjean, P; Srianand, R; Fox, A. J; Coppolani, F; Schwope, A (Blackwell Publishing, 2010-01)
    We present optical spectroscopic identifications of X-ray sources in similar to 3 deg2 of the XMM-Large Scale Structure survey (XMM-LSS), also covered by the Canada-France-Hawaii Telescope Legacy Survey (CFHTLS), obtained ...
  • Polarization : proving ground for methods in radiative transfer 
    Nagendra, K. N; Anusha, L. S; Sampoorna, M (Societa Astronomica Italiana, 2009)
    Polarization of solar lines arises due to illumination of radiating atom by anisotropic (limb darkened/brightened) radiation. Modelling the polarized spectra of the Sun and stars requires solution of the line radiative ...
  • Development of sunshield panels for passive radiant cooler on board meteorological instruments of ISRO 
    Madhu Prasad; Akkimaradi, B. S; Santram; Selvan, T; Subramanya; Rastogi, S. C; Badrinarayana, K; Bhandari, D. R; Sugumar, M; Mallesh, B; Rajam, K. S; Indira Rajgopalan; Grips, V. K. W; Balaraju, J. N; Saxena, A. K; Ismail Jabilullah, R; Viswanathan, M; Shanbhog, G (2009)
    Radiant cooler is used to cool the infrared and water vapour detectors of meteorological payload. It consists of patch (cold stage) on which detector is mounted, intermediate cooling stage radiator, vacuum housing to enclose ...
  • Solar activity 
    Das, A. K (Royal Astronomical Society, 1956)
  • Annual wave in the world-wide F-region ionization 
    Bhargava, B. N (Manager of Publications Civil Lines Delhi, 1959)
    An analysis of squares of noon median F2 layer critical frequencies for a 3-year period has been made in order to derive the latitude variation of the annual effect in the electron densities and its relation to average F2 ...
  • Wave propagation in the magnetic network on the Sun 
    Hasan, S. S; Vigeesh, G; van Ballegooijen, A. A (Cambridge University Press, 2006)
    Hasan et al. (2005) have recently presented 2-D dynamical calculations on wave propagation in in the magnetic network of the Sun. The latter is idealized as consisting of non-potential flux tubes in the quiet solar ...
  • Wave propagation and energy transport in the magnetic network of the Sun 
    Vigeesh, G; Hasan, S. S; Steiner, O (European Southern Observatory, 2009-12)
    Aims. We investigate wave propagation and energy transport in magnetic elements, which are representatives of small scale magnetic flux concentrations in the magnetic network on the Sun. This is a continuation of earlier ...
  • Alfven waves in a gravitational field with flows 
    Satya Narayanan, A; Kathiravan, C; Ramesh, R (Cambridge University Press, 2009-03)
    The gravitational stratification effect on magnetohydrodynamic waves at a single interface in the solar atmosphere has been studied in the penumbral region of the sunspot recently. The existence of slow and fast magneto ...
  • Sudden commencements and impulses in Kodaikanal magnetograms - their hourly frequency 
    Murthy, B. S (Manager of Publications Civil Lines Delhi, 1959-04)
    The diurnal variation in the frequencies of sudden commencements (SCs) and sudden impulses (SIs) at Kodaikanal (10.2°N, 77.5°E) is analysed from the data for the period 1949-1957. The hourly frequency curve of SCs and SIs ...

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