IIA Institutional Repository

Browsing IIAP Publications by Title

Browsing IIAP Publications by Title

Sort by: Order: Results:

  • Excitation of Oscillations in Photospheric Flux Tubes through Buffeting by External Granules 
    Hasan, S. S; Kalkofen, W (The American Astronomical Society, 1999-07)
    We examine the excitation of transverse (kink) and longitudinal (sausage) waves in magnetic flux tubes by granules in the solar photosphere. The investigation is motivated by the interpretation of network oscillations in ...
  • Excitation of Oscillations in the Magnetic Network on the Sun 
    Hasan, S. S; Kalkofen, W; van Ballegooijen, A. A (The American Astronomical Society, 2000-05)
    We examine the excitation of oscillations in the magnetic network of the Sun through the footpoint motion of photospheric magnetic flux tubes located in intergranular lanes. The motion is derived from a time series of ...
  • Excitation of vertical breathing motion in disc galaxies by tidally-induced spirals in fly-by interactions 
    Kumar, Ankit; Ghosh, Soumavo; Kataria, Sandeep Kumar; Mousumi Das; Debattista, Victor P (Oxford University Press on behalf of Royal Astronomical Society, 2022-10)
    It is now clear that the stars in the Solar neighbourhood display large-scale coherent vertical breathing motions. At the same time, Milky Way-like galaxies experience tidal interactions with satellites/companions during ...
  • Existence of Nanoparticle Dust Grains in the Inner Solar Corona? 
    Singh, J; Sakurai, T; Ichimoto, K; Hagino, M; Yamamoto, T. T (The American Astronomical Society, 2004-06)
    Motivated by the recent paper by Habbal et al., we have made spectroscopic observations in the wavelength range of 1072.8-1079.0 nm of the solar corona above the coronal hole region on several days using a coronagraph. We ...
  • EXOSAT observations of the Be/X-ray binaries 2S0114+65 and 4U2206+54 
    Saraswat, P; Apparao, K. M. V (International Astronomical Union, 1994)
  • EXOSAT observations of the broad-line radio galaxy 3C 382 
    Ghosh, K. K; Soundararajaperumal, S (University of Chicago Press, 1992-04)
    Results are presented of numerous X-ray observations of the broad-line radio galaxy 3C 382 carried out with Exosat between 1983 and 1985, with emphasis on a major outburst of this galaxy in 1985. During the outburst, both ...
  • EXOSAT observations of the Seyfert 1 galaxy NGC 3516 
    Ghosh, K. K; Soundararajaperumal, S (University of Chicago press, 1991-12)
    This study presents results of the X-ray spectra (0.1-10 keV) of the Seyfert galaxy NGC 3516 on the basis of Exosat observations obtained on four epochs between 1985/308 and 1985/340. The soft X-ray (0.2-2 keV) flux of ...
  • Expanding chromospheres of late G and K supergiants 
    Mallik, S. G. V (Royal Astronomical Society, 1986-09)
    The radiative transfer problem in non-LTE moving atmospheres has been explicitly solved for Hα line profiles. These computations have been done for a schematic model of the line-forming region over a wide range of optical ...
  • Expanding shell and P Cygni profiles of 27 Canis Majoris 
    Ghosh, K. K (American Astronomical Society, 1990-09)
    H-alpha and He I profiles of 27 CMa obtained between January 1985 and February 1989 are presented. Velocities of blue absorption and red emission components of H-alpha were different from that of He I, suggesting that the ...
  • Expected performances of a Laue lens made with bent crystals 
    Virgilli, Enrico; Valsan, V; Frontera, Filippo; Caroli, Ezio; Liccardo, Vincenzo; Stephen, John Buchan (SPIE-The International Society for Optical Engineering, 2017-10)
    In the context of the Laue project devoted to build a Laue lens prototype for focusing celestial hard x-/soft gamma-rays, a Laue lens made of bent crystal tiles, with 20-m focal length, is simulated. The focusing energy ...
  • Experimental evaluation of centroiding algorithms at different light intensity and noise levels 
    Roopashree, M. B; Vyas, A; Prasad, B. R (American Institute of Physics, 2011-10)
    In this paper, we present results from an experimental evaluation of centroiding algorithms, simple center of gravity (CoG) and weighted center of gravity (WCoG) in a Shack Hartmann wavefront sensor at different light ...
  • Experimental Validation of a Novel Concept to Reduce Optical Surface Wave Front Errors by Using Deformable Bushes at Opto-Mechanical Interfaces 
    Nagabhushana, S; Prasad, B. R; Nagesh, Suresh; Venkata Suresh, Narra; Sandeep, D. S; Kamath, P. U; Misra, Shalab; Hegde, Bhavana; Utkarsha, D; Sinha, Mrityunjay Kumar; Kathiravan, S; Natarajan, V; Pawan, Kumar; Amit Kumar (World Scientific Publishing, 2022-03)
    One of the major objectives of the optomechanics is to support large optics required for the purpose and also to maintain high dynamic stability in operation. This requirement calls for more number of supports, to support ...
  • Experimental validation of XRF inversion code for Chandrayaan-1 
    Athiray, P. S; Sudhakar, M; Tiwari, M. K; Narendranath, S; Lodha, G. S; Deb, S. K; Sreekumar, P; Dash, S. K (Elsevier B.V., 2013-12)
    We have developed an algorithm (x2abundance) to derive the lunar surface chemistry from X-ray fluorescence (XRF) data for the Chandrayaan-1 X-ray Spectrometer (C1XS) experiment. The algorithm converts the observed XRF line ...
  • Experimental verification of the new mounting of concave grating 
    Singh, M (National Institute of Science Communication and Information Resource, 1977-12)
  • 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 ...
  • Exploiting large surveys for galactic astronomy 
    Corbally, C. J; Bailer-Jones, C. A. L; Giridhar, S; Lloyd Evans, T. H (Cambridge University Press, 2007-08)
    This summary of JD13, Exploiting large surveys for Galactic astronomy, is based on the talks that were given during the meeting and/or submitted to the full proceedings which appeared in MemSAI 77 no. 4, 2006. The electronic ...
  • Exploring diffuse radio emission in galaxy clusters and groups with uGMRT and SKA 
    Paul, Surajit; Kale, Ruta; Basu, Aritra; Sur, Sharanya; Parekh, Viral; Gupta, Prateek; Chatterjee, Swarna; Salunkhe, Sameer; Iqbal, Asif; Pandey-Pommier, Mamta; Raja, Ramij; Rahaman, Majidul; Raychaudhury, Somak; Nath, Biman B; Majumdar, Subhabrata (Indian Academy of Sciences, 2023-06)
    Diffuse radio emission has been detected in a considerable number of galaxy clusters and groups, revealing the presence of pervasive cosmic magnetic fields, and of relativistic particles in the large scale structure of the ...
  • Exploring Neutral Hydrogen in Radio MOlecular Hydrogen Emission Galaxies (MOHEGs) and Prospects with the SKA 
    Wagh, Sai; Pandey-Pommier, Mamta; Roy, Nirupam; Rashid, Md; Marcowith, Alexandre; Muthumariappan, C; Ramya, S; Roy, Subhashis; Guiderdoni, Bruno (American Astronomical Society, 2024-03-10)
    Empirical studies of cold gas content are essential for comprehending the star formation activities and evolution in galaxies. However, it is not straightforward to understand these processes because they depend on various ...
  • Exploring NGC 2345: A Comprehensive Study of a Young Open Cluster through Photometric and Kinematic Analysis 
    Belwal, Kuldeep; Bisht, D; Bisht, Mohit Singh; Rangwal, Geeta; Raj, Ashish; Dattatrey, Arvind K; Yadav, R. K. S; Bhatt, B. C (American Astronomical Society, 2024-05-01)
    We conducted a photometric and kinematic analysis of the young open cluster NGC 2345 using CCD UBV data from 2 m Himalayan Chandra Telescope, Gaia Data Release 3, Two Micron All-Sky Survey, and the Photometric All-Sky ...
  • Exploring pre-main sequence variables of ONC: the new variables 
    Parihar, P. S; Messina, S; Distefano, E; Shantikumar, N. S; Medhi, B. J (Wiley Blackwell, 2009-07)
    Since 2004, we have been engaged in a long-term observing program to monitor young stellar objects in the Orion Nebula Cluster. We have collected about two thousands frames in V, R, and I broad-band filters on more than ...

Search DSpace


Browse

My Account