IIA Institutional Repository: Recent submissions

  • Characteristics of the solar wind at 1 a.u. in relation to Hale sector boundaries 
    Sastri, J. H (Elsevier, 1986-09)
    A study is made of the solar wind characteristics at 1 a.u. in the vicinity of Hale and anti-Hale sector boundaries (SBs), after isolating the SBs with solar activity related temporal flows and/or transient interplanetary ...
  • Crustal shear velocity structure of the south Indian shield 
    Rai, S. S; Priestley, K; Suryaprakasam, K; Srinagesh, D; Gaur, V. K; Du, Z (American Geophysical Union, 2003-02-11)
    The south Indian shield is a collage of Precambrian terrains gathered around and in part derived from the Archean-age Dharwar craton. We operated seven broadband seismographs on the shield along a N-S corridor from Nanded ...
  • The nature of the crust in southern India: Implications for Precambrian crustal evolution 
    Gupta, S; Rai, S. S; Prakasam, K. S; Srinagesh, D; Bansal, B. K; Chandha, R. K; Priestley, K; Gaur, V. K (American Geophysical Union, 2003-04-16)
    We present crustal thickness and Poisson's ratio determinations from receiver function analyzes at 32 sites on the Archaean and Proterozoic terrains of South India. The crustal thickness in the late Archaean (2.5 Ga) Eastern ...
  • E2-transition probabilities for NiXVIII 
    Ray, H (Kluwer Academic Publishers, 2003-02)
    Accurate theoretical data for the transition probabilities are highly demanding in astrophysics and in the study of plasma in astrophysical objects and fusion devices. Na-like highly stripped ions of iron group, specially ...
  • Optical spectroscopic and 2MASS measurements of Stephenson Halpha stars 
    Maheswar, G; Manoj, P; Bhatt, H. C (European Southern Observatory, 2003-05)
    We present the results of spectroscopic observations for 52 objects from the list of Halpha emission stars of Stephenson (\cite{Ste86}). Out of six known T Tauri stars observed, five showed Halpha in emission and in one ...
  • Understanding the Radio Emission Geometry of Multiple-Component Radio Pulsars from Retardation and Aberration Effects 
    Gupta, Y; Gangadhara, R. T (The American Astronomical Society, 2003-02)
    We have conducted a detailed analysis of the emission geometry of a handful of radio pulsars that have prominent, multiple-component profiles at meter wavelengths. From careful determination of the total number of emission ...
  • Quantum chromodynamics (QCD) and hadronic structure 
    Basu, R; Ravindran, V (Indian Academy of Sciences, 2003-02)
    We discuss potential problems in hadronic physics. Recent developments are reviewed and possible future studies in some interesting areas which are underway are highlighted
  • Spectroscopic Studies of the Solar Corona. IV. Physical Properties of Coronal Structure 
    Singh, J; Ichimoto, K; Sakurai, T; Muneer, S (The American Astronomical Society, 2003-03)
    We obtained spectrographic observations of several coronal structures at the limb overlying the sunspot regions, simultaneously in the Fe XIV (5303 Å) and Fe X (6374 Å) emission lines on several days, and simultaneously ...
  • Metric observations of transient, quasi-periodic radio emission from the solar corona in association with a ``halo'' CME and an ``EIT wave'' event 
    Ramesh, R; Kathiravan, C; Satya Narayanan, A; Ebenezer, E (The European Southern Observatory, 2003-03)
    We present metric radio observations of quasi-periodic emission from the solar corona in close association with a ``halo'' CME and an ``EIT wave'' phenomenon. The radio event lasted for about 60 s. Its mean periodicity was ...
  • Correlated X-ray timing and spectral behavior in GX 349+2 
    Agrawal, V. K; Bhattacharyya, S (The European Southern Observatory, 2003-01)
    We present a detailed and systematic investigation of correlated spectral and timing properties of the Z source GX 349+2, using extensive data ( ~ 221 ks) obtained from the Proportional-Counter-Array on-board RXTE satellite, ...
  • Explaining the Observed Polarization from Brown Dwarfs by Single Dust Scattering 
    Sengupta, S (The American Astronomical Society, 2003-03)
    Recent observation of linear optical polarization from brown dwarfs confirms the dust hypothesis in the atmospheres of brown dwarfs with effective temperature higher than 1400 K. The observed polarization could arise because ...
  • Predictions of strengths of long-term variations in sunspot activity 
    Javaraiah, J (The European Southern Observatory, 2003-04)
    Recently, using Greenwich data (1879-1976) and SOON/NOAA data (1977-2002) on sunspot groups we found a big or a moderate drop in the solar equatorial rotation rate, A, occurred after every four solar cycles suggesting the ...
  • Kink and Longitudinal Oscillations in the Magnetic Network on the Sun: Nonlinear Effects and Mode Transformation 
    Hasan, S. S; Kalkofen, W; van Ballegooijen, A. A; Ulmschneider, P (The American Astronomical Society, 2003-03)
    We examine the propagation of kink and longitudinal waves in the solar magnetic network. Previously, we investigated the excitation of network oscillations in vertical magnetic flux tubes through buffeting by granules and ...
  • 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 ...
  • The Rapidly Flaring Afterglow of the Very Bright and Energetic GRB 070125 
    Updike, A. C; Haislip, J. B; Nysewander, M. C; Fruchter, A. S; Kann, D. A; Klose, S; Milne, P. A; Williams, G. G; Zheng, W; Hergenrother, C. W; Prochaska, J. X; Prochaska, J. X; Mirabal, N; Thorstensen, J. R; van der Horst, A. J; Starling, R. L. C; Racusin, J. L; Burrows, D. N; Kuin, N. P. M; Roming, P. W. A; Bellm, E; Hurley, K; Li, W; Filippenko, A. V; Blake, C; Starr, D; Falco, E. E; Brown, W. R; Dai, X; Deng, J; Xin, L; Qiu, Y; Wei, J; Urata, Y; Nanni, D; Palazzi, E; Greco, G; Bartolini, C; Guarnieri, A; Piccioni, A; Pizzichini, G; Terra, F; Misra, K; Bhatt, B. C; Anupama, G. C; Fan, X; Jiang, L; Wijers, R. A. M. J; Reichart, D. E; Eid, H. A; Bryngelson, G; Puls, J; Goldthwaite, R. C; Hartmann, D. H (The American Astronomical Society, 2008-09)
    We report on multiwavelength observations, ranging from X-ray to radio wave bands, of the IPN-localized gamma-ray burst GRB 070125. Spectroscopic observations reveal the presence of absorption lines due to O I, Si II, and ...
  • Spectroscopic Studies of the Solar Corona - V. Physical Properties of Coronal Structures 
    Singh, J; Sakurai, T; Ichimoto, K; Muneer, S (Springer, 2003-02)
    Spectra around the 6374 Å [Fex] and 7892 Å [Fexi] emission lines were obtained simultaneously with the 25-cm coronagraph at Norikura Observatory covering an area of 200' '×500' ' of the solar corona. The line width, peak ...
  • Long-Term Variations in the Solar Differential Rotation 
    Javaraiah, J (Springer, 2003-01)
    Using Greenwich data (1879 1976) and SOON/NOAA data (1977 2002) on sunspot groups we found the following results: (i) The Sun's mean (over all the concerned cycles during 1879 1975) equatorial rotation rate (A) is significantly ...
  • Pc-scale study of radio galaxies and BL Lacs 
    Kharb, P; Shastri, P; Gabuzda, D. C (Elsevier, 2003-10)
    We study two aspects of the differences between Active Galactic Nuclei (AGN) of the two Fanaroff-Riley types in order to investigate the causes of the F-R divide. We: (a) contrast the properties of the optical cores in ...
  • Photometry of BD -7 deg 3007 
    Shylaja, B. S (Kluwer Academic Publishers, 1987-02)
    Photometric observations of BD -7°3007 in B and V filters are reported. Rapid flickering appears to be present at all phases, implying an unfavourable angle of inclination of orbit for seeing eclipse effects. A modulation ...
  • Cosmological constraint on black hole temperatures 
    Sivaram, C (American Association of Physics Teachers, 1983-03)

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