IIA Institutional Repository: Recent submissions

  • An efficient decomposition technique to solve angle-dependent Hanle scattering problems 
    Supriya, H. D; Sampoorna, M; Nagendra, K. N; Ravindra, B; Anusha, L. S (Elsevier, 2013-04)
    Hanle scattering is an important diagnostic tool to study weak solar magnetic fields. Partial frequency redistribution (PRD) is necessary to interpret the linear polarization observed in strong resonance lines. Usually ...
  • Reliability test for the experimental results of electric-quadrupole hyperfine-structure constants and assessment of nuclear quadrupole moments in 135Ba and 137Ba 
    Sahoo, B. K; Barrett, M. D; Das, B. P (American Physical Society, 2013-04)
    We investigate electric quadrupole hyperfine-structure constant (B) results in 135Ba+ and 137Ba+ and compare their ratios with the reported measurements of the ratio between the nuclear quadrupole moment (Q) values of these ...
  • Fine image motion controler for Kodaikanal tunnel telescope 
    Thulasidharen, K. C; Prabhu, K; Rangarajan, K. E; Vasantharaju, N; Prabhu Ramkumar, B (Indian Institute of Astrophysics, 2013-05-06)
    Automation of the spectropolarimetric observations at Kodaikanal tunnel telescope needs placement of the Sun's image on the spectrograph slit and scanning it across the region of interest. This requirement can be achieved ...
  • Habitable Planets Eclipsing Brown Dwarfs: Strategies for Detection and Characterization 
    Belu, A. R; Selsis, F; Raymond, S. N; Palle, E; Street, R; Sahu, D. K; Braun, K. V; Bolmont, E; Figueira, P; Anupama, G. C; Ribas, Ignasi (IOP Publishing, 2013-05-10)
    Given the very close proximity of their habitable zones, brown dwarfs (BDs) represent high-value targets in the search for nearby transiting habitable planets that may be suitable for follow-up occultation spectroscopy. ...
  • Modeling the Quantum Interference Signatures of the Ba II D2 4554 Å Line in the Second Solar spectrum 
    Smitha, H. N; Nagendra, K. N; Stenflo, J. O; Sampoorna, M (IOP Publishing, 2013-05-10)
    Quantum interference effects play a vital role in shaping the linear polarization profiles of solar spectral lines. The Ba II D2 line at 4554 Å is a prominent example, where the F-state interference effects due to the odd ...
  • Rotational shearing interferomater 
    Yeswanth, L (Indian Institute of Astrophysics, 2013-05-03)
    A rotational shearing interferometer is a modification of the Michelson’s interferometer to obtain the spatial coherence of the light waves. It is mainly used for obtaining diffraction limited images of astronomical ...
  • Scientists downplay earthquake risks 
    Divya Gandhi (The Hindu, 2013-05-01)
    Two destructive earthquakes within a week of each other, the first with a 7.5 magnitude on the Iran-Pakistan border, on April 16, and the second measuring 5.6 in eastern Afghanistan last Wednesday, were unsettlingly felt ...
  • ARCO: a program for Automatic Reduction of CCD Observations 
    Distefano, E; Messina, S; Cutispoto, G; Parihar, P. S; Comparato, M; Busá, I; Lanza, A. F; Lanzafame, A. C; Pagano, I; Strassmeier, K. G (EDP Sciences, 2007)
    The huge amount of CCD photometric data collected by robotic telescopes (as for instance the ICE-T telescope to be installed at Dome-C) requires a fully automated approach to the reduction and analysis procedures. To this ...
  • Characterization of solar multi-scaling magnetic loop interactions 
    Rosa, R. K; Karlicky, M; Zanandrea, A; Sych, R. A; Hanumant, S. S; Krishan, V (American Institute of Physics, 2005-09)
    Solar magnetic loop structures can exist in a broad range of spatio-temporal scales and their mutual interactions are described by nonlinear processes of magnetic reconnection triggered as a secondary regime by a primary ...
  • The Nature of γ -ray loud Narrow-line Seyfert I Galaxies PKS 1502+036 And PKS 2004-447 
    Paliya, Vaidehi S; Stalin, C. S; Shukla, A; Sahayanathan, S (IOP Publishing, 2013-05-01)
    Variable γ-ray emission has been discovered in five radio-loud narrow-line Seyfert 1 (NLSy1) galaxies by the Large Area Telescope on board the Fermi Gamma-ray Space Telescope. This has clearly demonstrated that these NLSy1 ...
  • The RACE-OC project: Rotation and ACtivity Evolution in Open Clusters 
    Messina, S; Distefano, E; Parihar, P. S; Busa, I; Cutispoto, G; Lanza, A.F; Lanzafame, A; Pagano, I; Biazzo, K; Leto, G; Hatzidimitriou, D; Kim, S. -L; Koo, J. -R; Kang, Y. B (American Institute of Physics, 2009)
    The RACE‐OC project, standing for Rotation and Activity Evolution in Open Clusters, is a long‐term project aimed at studying the evolution of rotation and magnetic activity of late‐type members of stellar open clusters. ...
  • Complex Variations in the Line-Intensity Ratio of Coronal Emission Lines with Height above the Limb 
    Singh, J; Sakurai, T; Ichimoto, K; Watanabe, T (IOP Publishing, 2004-12-10)
    We obtained spectroscopic observations simultaneously in pairs of coronal emission lines, one line being [Fe X] λ6374 and the other line being [Fe XI] λ7892, [Fe XIII] λ10747, or [Fe XIV] λ5303, and we studied the variations ...
  • Photometric and spectroscopic evolution of supernova SN 2009an: another case of a transitional Type Ia event 
    Sahu, D. K; Anupama, G. C; Anto, P (Oxford University Press on behalf of the Royal Astronomical Society, 2013-04-01)
    We present optical UBVRI photometry and medium-resolution spectroscopy of a transitional Type Ia supernova, SN 2009an, over the period −6 to +150 d from the B maximum. With a Δm15(B) = 1.514 ± 0.132, SN 2009an declines ...
  • Effect of the solar eclipse on some atmospheric parameter 
    Rai, J; Rai, A; Kumar, A; Singh, A. K; Singh, M. P; Nigam, M. J (Indian Institute of Astrophysics, Bangalore, 1997)
    To study the solar terrestrial atmospheric parameters such as positive conductivity, negative conductivity, aerosols measurement for forward and backward scattering and atmospheric temperature were recorded at Roorkee ...
  • Record of extended corona using colour video 
    Saxena, A. K; Samson, J. P. A; Lancelot, J. P (Indian Institute of Astrophysics, Bangalore, 1997)
    The entire event of the total solar eclipse of October 24 1995 was vediographed at our Kalpi camp. We have used SONY handy cam Video 8 Model No. CCD FX 280E PAL attached with 12x variable zoom lens. Partial eclipse was ...
  • Response of the small-scale dynamics of lower F-region plasma over Kodaikanal to the total solar eclipse of October 24, 1995 
    Visweswara Rao, J. V. S; Sastri, J. H (Indian Institute of Astrophysics, Bangalore, 1997)
    Continuous and high-time resolution recording of the changes in phase path (Doppler frequency shift) of lower F-region reflections over Kodaikanal were made in the forenoon on October 24, 1995 and on several days prior to ...
  • F-region oscillations observed during October 24, 1995 solar eclipse at Waltair 
    Rao, B. M; Anhjaneyulu, P (Indian Institute of Astrophysics, Bangalore, 1997)
    Measurements of changes in phase path/Doppler of HF signals on 5.5 MHz from F-region of the ionosphere are carried-out using coherent pulsed Doppler radar. Preliminary analysis of the data show large deviations in phase ...
  • Observations of surface atmospheric electric potential gradient and boundary layer parameter during the total solar eclipse of October 24, 1995 
    Manohar, G. K; Kandalgaonkar, S. S; Vernekar, K. G; Trimbake, H. K (Indian Institute of Astrophysics, Bangalore, 1997)
    A study of the impact of a total solar eclipse (TSE) on surface atmospheric electricity was made using observations of surface electrical potential gradient and boundary layer parameters during the TSE of 24 October 1995 ...
  • NCSTC programme on total solar eclipse 1995 
    Kamble, V. B (Indian Institute of Astrophysics, Bangalore, 1997)
    NCSTC and Vigyan Prasar jointly undertook a country wide programme on S & T popularization built around the total solar eclipse (TSE) of October 24, 1995. The main objective of the program was to polarize astronomy in ...
  • Details of the expedition to Iradatganj during total solar eclipse of October 24, 1995 
    Bandyopadhyay, A; Pandey, P; Narayan, A; Biswas, C; Neogy, S (Indian Institute of Astrophysics, Bangalore, 1997)
    Equipment: Celestron C-14 Schmidt Cassegrain Telescope (14" diameter), off-axis 6" solar filter, ST6 CCD camera, Off-axis polaroid filter 6" rotatable in steps of 60 degree.

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