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Browsing IIAP Publications by Title

Browsing IIAP Publications by Title

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  • On the rotational temperature of AlH in Sunspots 
    Karthikeyan, B; Rajamanickam, N; Bagare, S. P (Springer, 2010-07)
    A search has been carried out for the presence of rotational lines of two bands of the (0, 0) and (1, 1) A 1Π – X 1Σ+ system of the AlH molecule in the high resolution Fourier Transform Spectra of sunspots observed at the ...
  • On the saturation of the refractive index structure function. I - Enhanced hopes for long baseline optical interferometry 
    Venkatakrishnan, P; Chatterjee, S (Royal Astronomical Society, 1987-01)
    The Kolomogorov- Obukhov law for the refractive index structure function is shown to be only an approximation valid in the inertial sub range of turbulence. The inclusion of saturation effects for larger separations leads ...
  • On the saturation of the refractive index structure function. II - Influence of the correlation length on astronomical 'seeing' 
    Venkatakrishnan, P (Royal Astronomical Society, 1987-12)
    A physical length scale in the wavefront corresponding to the parameter (r/sub0/) characterizing the loss in detail in a long exposure image is identified, and the influence of the correlation scale of turbulence as r/sub ...
  • On the Scarcity of Dense Cores (n>105 cm−3 ) in High-latitude Planck Galactic Cold Clumps 
    Xu, Fengwei; Wang, Ke; Liu, Tie; Eden, David; Liu, Xunchuan; Juvela, Mika; He, Jinhua; Johnstone, Doug; Goldsmith, Paul; Garay, Guido; Wu, Yuefang; Archana Soam; Traficante, Alessio; Ristorcelli, Isabelle; Falgarone, Edith; Chen, Huei-Ru Vivien; Hirano, Naomi; Doi, Yasuo; Kwon, Woojin; White, Glenn J; Whitworth, Anthony; Sanhueza, Patricio; Rawlings, Mark G; Alina, Dana; Ren, Zhiyuan; Lee, Chang Won; Tatematsu, Kenichi; Zhang, Chuan-Peng; Zhou, Jianjun; Lai, Shih-Ping; Ward-Thompson, Derek; Liu, Sheng-Yuan; Gu, Qilao; Chakali, Eswaraiah; Zhu, Lei; Mardones, Diego; Toth, L. Viktor (American Astronomical Society, 2024-03-01)
    High-latitude (|b| > 30°) molecular clouds have virial parameters that exceed 1, but whether these clouds can form stars has not been studied systematically. Using JCMT SCUBA-2 archival data, we surveyed 70 fields that ...
  • On the scattering of light by a periodic structure in the presence of randomness II. On the detection of weak periodicities 
    Chatterjee, S; Vani, V. C (Taylor & Francis LTD, 2003-04)
    Light scattering by a rough grating is examined in the context of detecting a hidden periodic part. We make use of the fact that differentiated signals enhance the structures contained in the signal so that these derivatives ...
  • On the search for BF, BH and BS molecular lines in sunspot spectra 
    Karthikeyan, B; Bagare, S. P; Rajamanickam, N; Raja, V (Elsevier, 2009-02)
    A search has been carried out for the presence of rotational lines of boron containing diatomic molecules BF, BH and BS in the high resolution Fourier Transform Spectra of sunspots observed at the National Solar Observatory ...
  • On the Sensitivity of Partial Redistribution Scattering Polarization Profiles to Various Atmospheric Parameters 
    Sampoorna, M; Trujillo Bueno, J; Landi Degl'Innocenti, E (IOP Publishing, 2010-10)
    This paper presents a detailed study of the scattering polarization profiles formed under partial frequency redistribution (PRD) in two thermal models of the solar atmosphere. Particular attention is given to understanding ...
  • On the simultaneous existence of eastward and westward flowing equatorial electrojet currents 
    Rastogi, R. G (Indian Academy of Sciences, 1975-02)
    Experimental data on daily variations in the geomagnetic field are analyzed for evidence of counterflowing electrojets. In particular, the disappearance of the q type of Es layer (Es-q) and the appearance of blanketing-type ...
  • On the slow-down of the millisecond pulsar PSR 1937 + 214 
    Sivaram, C; Kochhar, R. K (Springer, 1984-01)
    There are indications that less than 10/sup-3 of the spin-down energy of the millisecond pulsar PSR 1937+214 emerges as electromagnetic radiation. The implications of this result are discussed. The surface magnetic field ...
  • On the spark spectra of lead 
    Rao, A. S (Government Observatory, Madras, 1930-12-22)
  • On the Spectral Curvature of VHE Blazar 1ES 1011 + 496: Effect of Spatial Particle Diffusion 
    Sinha, A; Sahayanathan, S; Acharya, B. S; Anupama, G. C; Chitnis, V. R; Singh, B. B (IOP Publishing, 2017-02-10)
    The American Astronomical Society, find out more The Institute of Physics, find out more On the Spectral Curvature of VHE Blazar 1ES 1011+496: Effect of Spatial Particle Diffusion Atreyee Sinha1, S. ...
  • On the stability of helical velocity and magnetic fields 
    Kochhar, R. K (D. Reidel Publishing Company, 1978-05)
    In this paper we study the stability of an infinitely conducting, incompressible, inviscid infinite cylinder with non-parallel helical velocity and magnetic field. It is shown that the system is stable if the energy in the ...
  • On the statistical detection of propagating waves in polar coronal holes 
    Gupta, G. R; O'Shea, E; Banerjee, D; Popescu, M; Doyle, J. G (EDP Sciences, 2009-01)
    Context. Waves are important to the study of dynamical processes in coronal holes and the acceleration of the fast solar wind. A spectral time series was taken with the SUMER spectrometer on-board SoHO on 20 October 1996. ...
  • On the survivability of cosmological quark nuggets 
    Bhattacharjee, P (World Scientific, 1994)
    The question of survivability of quark nuggets against the process of baryon evaporation from their surfaces is discussed within the context of a dynamical model, namely, the chromoelectric flux-tube fission model of baryan ...
  • On the tidal disruption of a spherical galaxy 
    Namboodiri, P. M. S; Kochhar, R. K (Blackwell Publishing, 1991-12)
    The disruption of a satellite galaxy as it undergoes collision with a massive perturber is investigated by numerical simulations. The models are restricted by a constant pericentric distance. The disruption of the satellite ...
  • On the triggering of a spotless double-ribbon flare 
    Rausaria, R. R; Aleem, S. M; Sundararaman, K (Springer Netherlands, 1992-11)
    We have studied the evolution of the double-ribbon, spotless flare of 21 February, 1992, using Kodaikanal Hagr and Kf1 observations. The analysis of the data shows that the Hagr filament underwent a large change in shear ...
  • On the usefulness of existing solar wind models for pulsar timing corrections 
    Tiburzi, C; Verbiest, J. P. W; Shaifullah, G. M; Janssen, G. H; Anderson, J. M; Horneffer, A; Kunsemoller, J; Ostowski, S; Donner, J. Y; Kramer, M; Anshu Kumari; Porayko, N. K; Zucca, P; Ciardi, B; Dettmar, R.J; Griebmeier, J.M; Hoeft, M; Serylak, M (Oxford University Press on behalf of the Royal Astronomical Society, 2019-07)
    Dispersive delays due to the solar wind introduce excess noise in high-precision pulsar timing experiments, and must be removed in order to achieve the accuracy needed to detect, e.g., low-frequency gravitational waves. ...
  • On the Variability of the Solar Mean Magnetic Field: Contributions from Various Magnetic Features on the Surface of the Sun 
    Souvik Bose; Nagaraju, K (IOP Publishing, 2018-07-20)
    The solar mean magnetic field (SMMF) is referred to as the disk-averaged line-of-sight (LOS) magnetic field that also reflects the polarity imbalance of the magnetic field on the Sun. The origin of the SMMF has been debated ...
  • On the Variation in the Volumetric Evolution of CMEs from the Inner to Outer Corona 
    Majumdar, Satabdwa; Patel, Ritesh; Pant, Vaibhav (American Astronomical Society, 2022-04-10)
    Some of the major challenges faced in understanding the early evolution of coronal mass ejections (CMEs) are due to the limited observations in the inner corona (<3 R⊙) and the plane-of-sky measurements. In this work, we ...
  • On the visual light curve of RT. Eridani 
    Bappu, M. K. V (Indian Academy of Sciences, 1946-07)

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