IIAP Publications: Recent submissions

  • On the occurrence and vertical movement of kink at Kodaikanal 
    Narayana Iyer, K; Rastogi, R. G (American Geophysical Union, 1974)
    The occurrence of ionospheric irregularities observed as sharp discontinuities (kinks) on the ionograms and moving upward with time at Kodaikanal have been studied for a period covering high, medium, and low solar activity ...
  • RR Lyrae stars in the inner LMC: Where did they form? 
    Subramaniam, A; Subramanian, S (EDP Sciences, 2009-08)
    RR Lyrae stars (RRLS) belong to population II and are generally used as a tracer of the host galaxy halo. The surface as well as vertical distribution of RRLS in the inner Large Magellanic Cloud (LMC) are studied to ...
  • Emission altitudes in radio pulsars with triple profiles 
    Kapoor, R. C; Shukre, C. S (2005)
    We propose here an independent method to understand emission altitudes in radio pulsars showing triple profiles. The centers of core and conal components in triple profiles are often non coincident in longitude. Treating ...
  • Low-cost adaptive optics for astronomical applications 
    Chinnappan, V; Saxena, A. K; Sreenivasan, A (The International Society for Optical Engineering (SPIE), 2001-09)
    Recent advancement in the technology in integrated circuit fabrication and new smart sensors allow us to implement adaptive optics systems which is otherwise not possible to implement a few years back with limited resources ...
  • Relativistic configuration-interaction study of the nuclear-spin-dependent parity-nonconserving electron-nucleus interaction constant W-A in BaF 
    Nayak, M. K; Das, B. P (The American Physical Society, 2009-06)
    A fully relativistic restricted active space configuration-interaction method is employed to compute the P-odd electron-nucleus interaction constant W-A for the ground ((2)Sigma(1/2)) state of BaF, which yields the result ...
  • The hanle effect in a random magnetic field: dependence of the polarization on statistical properties of the magnetic field 
    Frisch, H; Anusha, L. S; Sampoorna, M; Nagendra, K. N (EDP Sciences, 2009-07)
    The Hanle effect is used to determine weak turbulent magnetic fields in the solar atmosphere, usually assuming that the angular distribution is isotropic, the magnetic field strength constant, and that micro-turbulence ...
  • Observations on the occultation of the radio source Tauras A by the solar corona during June 1971 
    Sastry, Ch. V; Subramanian, K. R (National Institute of Science Communication and Information Resources, 1974-09)
    Observations on the occultation of the radio source Tamas A (3C 144) during June 1971 at a wavelength of 12 m are presented. It is tentatively observed that there is no strong dependence between the amount of scattering and ...
  • Spread-F at Kodaikanal 
    Sastri, J. H; Murthy, B. S (European Geophysical Society, 1975-06)
    Quarter-hourly ionograms of Kodaikanal for the period January 1968 to December 1969 have been examined for occurrence of Spread-F. Spread-F occurrence as a feature on ionograms is more or less a regular nocturnal event ...
  • Spectropolarimetry of an active region at the photosphere and chromosphere 
    Nagaraju, K; Sankarasubramanian, K; Rangarajan, K. E (Astronomical Society of the Pacific, 2009-06)
    Initial results on the simultaneous spectropolarimetric observations of an active region at the photosphere and chromosphere are presented. For this purpose, the Fe I line at λ6569 and the H I at λ6563 (Hα) are used. ...
  • Observations on spread-F at Kodaikanal 
    Sastri, J. H; Murthy, B. S (National Institute of Science Communication And Information Resources, 1975-06)
    A study of quarter-hourly ionograms of Kodaikanal (geomag. lat: O'6oN; dip: 3'5°N) showed several instances when the spread-F disappears and subsequently. reappears in two hrs or less during it night. Investigation of such ...
  • Magnetic and velocity properties of G-band bright points around a pore 
    Rangarajan, K. E; Sankarasubramanian, K; Nagaraju, K (Astronomical Society of the Pacific, 2009-06)
    Physical properties of G-band bright points (GBPs) surrounding a pore are studied using observations spanning from photosphere to chromosphere. The magnetic field strengths obtained in these bright points are of the order ...
  • The effect of polar magnetic sub-storms on the equatorial sporadic E 
    Rastogi, R. G (Indian Academy of Sciences, 1973)
    It is known that equatorial sporadic E disappears at night when dynamo field is east to west. During some DP/sub2 type magnetic sub-storms, which cause a depression of the geomagnetic horizontal field at the equator, the ...
  • Equatorial sporadic e and cross-field instability 
    Rastogi, R. G (Indian Academy of Sciences, 1972-05)
    The occurrence of sporadic E at an equatorial station during magnetically quiet daytime conditions corresponds almost exactly to the time during which the horizontal component of the earth’s magnetic field is above the ...
  • Geomagnetic crochets associated with proton flares 
    Sastri, J. H; Murthy, B. S; Karunakaran, D (National Institute of Science Communication And Information Resources, 1975-03)
  • A detailed study of the geomagnetic storm of 8-10 March 1970 
    Balakrishnan, T. K; Varadarajan, R; Singh, S. B; Karunakaran, D; Aleem, P. S. M (National Institute of Science Communication And Information Resources, 1973-03)
    A comprehensive study of the geomagnetic oscillations during the storm of 8 – 10 March 1970 is made using data obtained from equatorial stations. The oscillation characteristics during the three main phases of the storm ...
  • On the clustering of GRBs on the sky 
    Sethi, S. K; Bhargavi, S. G; Greiner, J (American Institute of Physics, 2000-09)
    The two-point correlation of the 4th (current) BATSE catalog (2494 objects) is calculated. It is shown to be consistent with zero at nearly all angular scales of interest. Assuming that GRBs trace the large scale structure ...
  • Observing the GRB remnants 
    Bhargavi, S. G; Cowsik, R; Perna, R (Astronomical Society of the Pacific, 2004-06)
    Following the predictions of Perna, Reymond & Loeb (2000) we have proposed an observational program to search for the GRB remnants in nearby galaxies using the telescopes of Indian Institute of Astrophysics, Bangalore. We ...
  • Photospheric field gradient in the neighbourhood of quiescent prominences 
    Nagabhushana, B. S; Gokhale, M. H (Springer, 1990)
    We have determined statistically the horizontal gradiant of the vertical magnetic field in the neighbourhood of filaments inside and outside the active regions during a few months in 1981 and in 1984. The results show that ...
  • Indian Astronomical Observatory, Hanle 
    Cowsik, R; Srinivasan, R; Prabhu, T (Astronomical Society of the Pacific, 2002)
    The Indian Institute of Astrophysics (IIA) Bangalore has established the Indian Astronomical Observatory (IAO) at an altitude of 4500 m above mean sea level atop Mt. Saraswati, Hanle, Changthang Ladakh, India. The birth ...
  • Hot post-AGB stars 
    Parthasarathy, M; Gauba, G; Fujii, T; Nakada, Y (Kluwer Academic Publishers, 2001-08)
    From the study of IRAS sources with far-IR colors similar to planetary nebulae (PNe), several proto-planetary nebulae with hot (OB) post-AGB central stars have been detected. These stars form an evolutionary link between ...

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