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  • 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 solar abundance of iron 
    Sinha, K; Sanwal, B. B (Astronomical Society of India, 1992)
    The MACKKL photospheric model and the latest oscillator strengths are used to obtain a solar abundance of iron close to the meteoritic value N(Fe) = 7.51 +/- 0.01. This helps to eliminate the discrepancy between photospheric ...
  • On the Solar Limb Darkening in the Wings of Some Atomic Hydrogen Lines 
    Bondal, K. R; Gaur, V. P; Pande, M. C (Astronomical Society of Indian, 1987-03)
    The centre-to-limb behaviour of the first four lines of the Balmer, Paschen, and Brackett series of atomic hydrogen at selected distances from the line centre, i.e. at delta lamda = 5, 10, 20 and 30 A has been theoretically ...
  • On the solar oscillator strength of SiH^{+} 
    Trivedi, C; Sinha, K (Astronomical Society of India, 1997)
    Rather contrasting values of the oscillator strengths for the (0,0) band of SiH+ molecules for the A 1II - X1 capital sigma+ transition have been reported in the literature. We investigate these with the help of a new set ...
  • 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 stability of the hypothetical quintet system of TW Draconis 
    Abhyankar, K. D; Bhatia, R. K; Devadas Rao, P (Astronomical Society of India, 1985-09)
    Aarseth`s NBODY 1 code is used to study the stability of the quintet system of DW Draconis postulated by Abhyankar & Panchatsaram (1984). It is found that the observed (O - C) curve based on the ephemeris by Tremko & Kreiner ...
  • 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 temperature distribuiton along a solar flare loop 
    Narain, Udit (Astronomical Society of India, 1983-03)
    We have obtained expressions for temperature distribution along a solar flare in the presence of a source of continued heating in constant cross section and line dipole geometries under nonstatic conditions. The quantitative ...
  • 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 total eclipse of the sun, on december the 11th, 1871, as visible in the Madras presidency 
    Ragoonatha Chary, C (Royal Astronomical Society, 1871)

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