IIAP Publications: Recent submissions

  • Comet C/2004 Q2 (Machholz) 
    Sastri, J. H; Vasundhara, R; Kuppuswamy, K; Velu, C (International Astronomical Union, 2005-02)
  • A new band system of BiF molecule in the region λ6200-λ7000 
    Murthy, P. S; Rao, D. V. K; Reddy, Y. P; Rao, P. T (Taylor & Francis Group, 1975)
    A reinvestigation of the electronic spectrum of BiF, has revealed the presence of a new system of bands, degraded to longer wavelengths, in the region λ6200-λ7000 Aring. The band heads could be represented by the following ...
  • Night time geomagnetic effects of solar flares 
    Sastri, J. H (European Geophysical Society, 1975-07)
    A study of the normal run magnetogram data of two equatorial stations, Kodaikanal (Geo. Long. 77 deg 28 min E, Dip 3.5 deg N) and Huancayo (Geo. Long. 75 deg 20 min W, Dip 2.0 deg N), for a three year period (1969-1971), ...
  • The geomagnetic solar flare effect of 6 July 1968 and its implications 
    Sastri, J. H (European Geophysical Society, 1975-12)
    A study of the geomagnetic solar flare effect (SFE) of July 6, 1968, observed at five Indian magnetic observatories, lying in the longitude range 72-80 E, revealed that this SFE is characterized by a decrease in the ...
  • On the points of bifurcation along the sequence of rotating axisymmetric masses with magnetic fields 
    Kochhar, R. K (Indian Academy of Sciences, 1975-11)
    It is shown that the points of bifurcation belonging to the third harmonics along the sequence of Maclaurin spheroids viewed from an inertial frame are distinct from the corresponding points along the Maclaurin sequence ...
  • 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 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)

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