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  • On the estimation of the amount of heating for solar coronal loops 
    Chandra, Suresh; Narain, Udit (Astronomical Society of India, 1982-03)
    In the present investigation the amount of heating for some coronal magnetic loops and kernels has been investigated in a general way in line-dipole and point-dipole geometries. This investigation differs from that of ...
  • On the EUV Line Diagnostics From N III Solar Ion 
    Gupta, A. K; Mohan, A; Dwivedi, B. N (Astronomical Society of India, 1997)
    We present new calculations for N III ion for diagnostics of solar plasma. The atomic model comprising the first 15 energy levels is considered for evaluating the line emissivities as a function of electron density and ...
  • On the evaluation of magnetic shear from H-alpha pictures 
    Venkatakrishnan, P (Kluwer Academic Publishers, 1993-01-10)
    It is shown that pre-flare activity in H-alpha filaments is unrelated to changes in magnetic shear. Changes in the shear angle are found to be related to either redeployment of the sources of magnetic flux relative to the ...
  • On the evolution of irradiated turbulent clouds: a comparative study between modes of triggered star formation 
    Anathpindika, S; Bhatt, H. C (Wiley-Blackwell, 2012-12)
    Gas within molecular clouds (MCs) is turbulent and unevenly distributed. Interstellar shocks such as those driven by strong fluxes of ionizing radiation (IR) profoundly affect MCs. While small dense MCs exposed to a strong ...
  • On the existence of interfacial waves with inclined magnetic fields 
    Satya Narayanan, A (European Southern Observatory, 1997-08)
    The dispersive characteristics of interfacial waves in low β plasma is studied. The condition for the existence of these waves is derived. It is assumed that the magnetic field and the propagation vector are inclined at ...
  • On the flare induced high-frequency global waves in the sun 
    Kumar, B; Mathur, S; García, R. A; Venkatakrishnan, P (Institute of Physics, 2010-03-01)
    Recently, Karoff & Kjeldsen presented evidence of strong correlation between the energy in the high-frequency part (5.3 < ν < 8.3 mHz) of the acoustic spectrum of the Sun and the solar X-ray flux. They have used disk-integrated ...
  • On the formation of a helmet streamer on January 24, 1992 at the south-west limb 
    Singh, J; Sakurai, T; Ichimoto, K; Hiei, E (Astronomical Society of India, 2000)
    We have analysed the soft X-ray images of the sun obtained with the YOHKOH satellite, white light coronal images observed at Mauna Loa and H-alpha pictures of the sun taken at Mitaka and Kodaikanal to study helmet streamers. ...
  • On the Formation of Bridges and Tails in Interacting Galaxies - II 
    Namboodiri, P. M. S; Kochhar, R. K; Alladin, S. M (Astronomical Society of Indian, 1987-12)
  • On the formation of tails and bridges in interacting galaxies 
    Namboodiri, P. M. S; Kochhar, R. K (Astronomical Society of India, 1985-12)
    Interacting galaxies produce peculiar feature like tails, bridges, and counterarms of various sizes and shapes. Numerical experiments have been performed to investigate as to how the formation of tails and bridges depends ...
  • On the Fractal Structure of Solar Supergranulation 
    Paniveni, U; Krishan, V; Singh, J; Srikanth, R (Springer, 2005-10)
    We employ fractal analysis to study the complexity of supergranulation structure using the Solar and Heliospheric Observatory (SOHO) dopplergrams. Our data consists of 200 visually selected supergranular cells, for which ...
  • On the Franck-Condon factors and R-centroids of the astrophysically interesting molecule CS 
    Karthikeyan, B; Raja, V; Rajamanickam, N; Bagare, S. P (National Library of Serbia, 2007-12)
    In molecular astrophysics, the Franck-Condon (FC) factors and r-centroids are essential for the interpretation of spectral intensities in terms of emitting astrophysical source conditions. They have been evaluated for the ...
  • On the frequency shift in radiation from a source orbiting a balckhole 
    Kapoor, R. C (Astronomical Society of India, 1981-09)
    An analytical study has been carried out of the non-tangential emission of photons in the orbital plane from a monochromatic source of radiation orbiting a blackhole, using the method of geometrical optics. The formulation ...
  • On the growth and decay of blanketing sporadic-E layers 
    Sastri, J. H (The Council of Scientific and Industrial Research, 1980-02)
    Vertical incidence ionospheric soundings with a C-3 ionosonde were performed at Kodaikanal (dip 3.5 deg N) at one minute intervals during October 1974-January 1975 with a view to monitoring the small scale fluctuations in ...
  • On the height control of the onset of equatorial spread-F 
    Sastri, J. H; Subrahmanyam, V; Sasidharan, K; Srirama Rao, M. (Indian Academy of Sciences, 1978-07)
  • On the Hubble diagram of QSOs with cosmological redshifts 
    Sapre, A. K; Mishra, V. D (Astronomical Society of India, 1996)
    In this paper we study the Hubble Diagram of the QSOs whose redshifts are known to be cosmological in nature. These are the QSOs which lie close to bright galaxies and whose redshifts are nearly equal to those of the bright ...
  • On the hydrogen-deficient nature of Z Ursae Minoris 
    Goswami, A; Kameswara Rao, N; Lambert, D. L; Gonzalez, G (The Astronomical Society of the Pacific, 1997-05)
    Z Ursa Minoris was classified by Benson et al. (1994) a a R Coronae Borealis (RCB) variable star from its light variations. Hydrogen deficiency, which is a defining feature of RCB stars, was not established. To investigate ...
  • On the hypothesis of ejection of supermassive black holes from centers of galaxies and its application to quasar-galaxy associations 
    Kapoor, R. C (D. Reidel Publishing Co., 1983-06)
    It is argued that accreting supermassive black holes ejected from centers of galaxies are the likely models for the quasars observed in association with galaxies. Also pointed out are the implications of a recent suggestion ...
  • On the infrared bands of a A10 related to Mira phenomena 
    Murty, P. S (D. Reidel Publishing Company, 1978-04)
    The calculated band positions and intensity factors for the bands of the infrared A-X transition of A10 suggest that an investigation for the infrared bands in the 1 to 5 micron region of the spectra of Mira stars and M ...
  • On the injection spectrum of relativistic electrons in high-redshift radio galaxies 
    Gopal-Krishna; Mhaskey, Mukul; Mangalam, A (IOP Publishing, 2012-01-01)
    We point out that the remarkable linearity of the ultra-steep radio spectra of high redshift radio galaxies re ects a previously reported general trend for powerful radio galaxies, according to which the spectral curvature ...
  • On the interaction of a thin, supersonic shell with a molecular cloud 
    Anathpindika, S; Bhatt, H. C (Wiley-Blackwell, 2011-04)
    Molecular Clouds (MCs) are stellar nurseries; however, formation of stars within MCs depends on the ambient physical conditions. MCs, over a free-fall time, are exposed to numerous dynamical phenomena, of which, the ...

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