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Browsing IIAP Publications by Title

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  • Forward modeling of propagating slow waves in coronal loops and their frequency-dependent damping 
    Mandal, Sudip; Magyar, N; Yuan, D; Van Doorsselaere, T; Banerjee, D (IOP Publishing, 2016-03)
    Propagating slow waves in coronal loops exhibit a damping that depends upon the frequency of the waves. In this study we aim to investigate the relationship of the damping length ( L d ) with the frequency of the ...
  • Forward modeling of standing slow modes in flaring coronal loops 
    Yuan, D; Van Doorsselaere, T; Banerjee, D; Antolin, P (IOP Publishing, 2015-07-01)
    Standing slow-mode waves in hot flaring loops are exclusively observed in spectrometers and are used to diagnose the magnetic field strength and temperature of the loop structure. Owing to the lack of spatial information, ...
  • Forward-scattering Hanle effect in the solar Ca i 4227 Å line 
    Frisch, H; Anusha, L. S; Bianda, M; Holzreuter, R; Nagendra, K. N; Ramelli, R; Sampoorna, M; Smitha, H. N; Stenflo, J. O (Cambridge University Press, 2012-06)
    High sensitivity spectropolarimetric observations of the four Stokes parameters of the solar Ca i 4227 Å line have been performed in October 2010 at IRSOL with the ZIMPOL polarimeter, near the disk center, outside an active ...
  • Four hundredth anniversary of Kepler’s supernova 
    Vishwanath, P. R (Indian Academy of Sciences, 2004-10)
  • Four years of starspot evolution on an active F-type ultra-fast rotator KIC 6791060 
    Karmakar, Subhajeet; Pandey, J. C; Savanov, Igor S; Raj, A; Dmitrienko, E. S; Pakhomov, Yurij; Sahu, D. K (Cambridge University Press, 2018-02)
    Using the data obtained from Kepler satellite, we have analyzed an F-type ultra-fast rotator KIC 6791060. We derive a rotational period of 0.34365±0.00004 d. Multiple periodicity with a period separation of ∼0.00016 d was ...
  • Four-component relativistic state-specific multireference perturbation theory with a simplified treatment of static correlation 
    Ghosh, A; Sinha Ray, Suvonil; Chaudhuri, R. K; Chattopadhyay, Sudip (American Chemical Society, 2017-02-23)
    The relativistic multireference (MR) perturbative approach is one of the most successful tools for the description of computationally demanding molecular systems of heavy elements. We present here the ground state dissociation ...
  • Four-component relativistic state-specific multireference perturbation theory with a simplified treatment of static correlation 
    Ghosh, A; Sinha Ray, Suvonil; Chaudhuri, R. K; Chattopadhyay, Sudip (American Chemical Society, 2017-02-23)
    The relativistic multireference (MR) perturbative approach is one of the most successful tools for the description of computationally demanding molecular systems of heavy elements. We present here the ground state dissociation ...
  • FPGA Based ASM implementation for CCD Camera Controller 
    Srinivasan, R; Anupama, K; Suneeta; Saha, S. K; Rao, A (MacMillan Publishers Ind. Ltd, 2009)
    A general purpose CCD controller that can address any CCD, has been developed at the Indian Institute of Astrophysics. It is based on a Digital Signal Processor (DSP) chip, Motorola DSP 56002 for implementing essential ...
  • FR Cnc revisited: photometry, polarimetry and spectroscopy 
    Golovin, A; Galvez-Ortiz, M. C; Hernan-Obispo, M; Andreev, M; Barnes, J. R; Montes, D; Pavlenko, E; Pandey, J. C; Martinez-Arnaiz, R; Medhi, B. J; Parihar, P. S; Henden, A; Sergeev, A; Zaitsev, S. V; Karpov, N (Wiley-Blackwell, 2012-03)
    This paper is part of a multiwavelength study aimed at using complementary photometric, polarimetric and spectroscopic data to achieve an understanding of the activity process in late-type stars. Here, we present the ...
  • Fractal structure of solar supergranulation 
    Paniveni, U; Krishan, V; Singh, J; Srikanth, R (European Space Agency, 2005-12)
    We employ fractal analysis to study the complexity of supergranulation structure using the solar and Heliospheric Observatory (SOHO) dopplergrams. Our data consist of 200 visually selected Supergranular cells, for which ...
  • Fraction of broad absorption line quasars in different radio morphologies 
    Nair, A; Vivek, M (Oxford University Press on behalf of Royal Astronomical Society, 2022-04)
    In this study, we investigated the orientation model of Broad Absorption Line (BAL) quasars using a sample of sources that are common in Sloan Digital Sky Survey (SDSS) Data Release (DR)-16 quasar catalogue and Very Large ...
  • Franck-Condon factors and /r-centroids for a number of band systems of the astrophysical molecule AlF 
    Kumar, K. B; Rajamanickam, N; Bagare, S. P; Gomez, F. M; Gonzalez, L. J. J. (Elsevier, 2003-10)
    Franck-Condon factors and /r-centroids, which are very closely related to transition probabilities, have been evaluated by the more reliable numerical integration procedure for the bands of B1Σ+-X1Σ+, C1Σ+-X1Σ+, c3Σ+-b3Σ+, ...
  • Franck-Condon factors and r-centroids for certain band systems of astrophysical molecules SrF and ScF 
    Ramachandran, P. S; Rajamanickam, N; Bagare, S. P; Kumar, B. C (Springer, 2005-01)
    The Franck-Condon factors and r-centroids, which are very closely related to vibrational transition probabilities, have been evaluated by the more reliable numerical integration procedure for the bands of B 2∑+ X 2∑+, F ...
  • French astronomers in India during the 17th - 19th centuries 
    Kochhar, R. K (British Astronomical Society, 1991-04)
    The contributions made by French astronomers from India are reviewed. The French were more successful on the scientific front than on the colonial. The first telescopic discovery from India was made by a French Jesuit ...
  • Frenet-Serret description of gyroscopic precession 
    Iyer, B. R; Vishveshwara, C. V (The American Physical Society, 1993)
    The phenomenon of gyroscopic precession is studied within the framework of the Frenet-Serret formalism adapted to quasi-Killing trajectories. Its relation to the congruence vorticity is highlighted with particular reference ...
  • Frequency and time profiles of metric wave isolated Type I solar noise storm bursts at high spectral and temporal resolution 
    Sundaram, G. A. S; Subramanian, K. R (Royal Astronomical Society, 2005-05)
    Type I noise storms constitute a sizeable fraction of the active Solar radio emission component. Observations of isolated instances of such bursts, in the swept-frequency mode at metric wavelengths, have remained sparse, ...
  • The frequency drift and time splitting of decameter solar radio bursts 
    Sastry, Ch. V (Gordon and Breach, Science Publishers Ltd., 1972-05)
    The frequency drift and time splitting of solar radio bursts are observed with a multi-channel radiometer and a polarimeter at frequencies around 25 MHz. It is found that a majority of noise storm bursts have drift ...
  • Frequency response of magnetic flux sheaths 
    Venkatakrishnan, P (D. Reidel Publishing Co., 1979-08)
    When a sound wave is incident on a magnetic flux sheath, it causes fluctuations in the mean magnetic field of the sheath. We have calculated the space-average of the longitudinal component of these fluctuations and plotted ...
  • Frequency shifts and line broadening of radiation from rotating neutron stars 
    Kapoor, R. C; Datta, B (The Royal Astronomical Society, 1984-08)
    The frequency shifts and line broadening of radiation from the surface of rapidly rotating neutron stars are calculated using a rotationally perturbed interior spherical metric and a representative choice of the equation ...
  • Frequency-dependent core shifts and parameter estimation for the blazar 3C 454.3 
    Mohan, Prashanth; Agarwal, A; Mangalam, A; Gupta, A. C; Wiita, P. J; Volvach, A. E; Aller, M. F; Aller, H. D; Gu, M. F; Lahteenmaki, A; Tornikoski, M; Volvach, L. N (Oxford University Press on behalf of the Royal Astronomical Society, 2015-09-11)
    We study the core shift effect in the parsec-scale jet of the blazar 3C 454.3 using the 4.8– 36.8 GHz radio light curves obtained from three decades of continuous monitoring. From a piecewise Gaussian fit to each flare, ...

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