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  • Characterization of a photon counting detector and Development of an attitude sensor for high altitude balloon experiments 
    Mathew, Joice (Indian Institute of Astrophysics, 2013-08)
    The information contained in an optical image can be expressed as the spatial and temporal variation in number of photons at very low light level. The high gain Micro Channel Plate (MCP) image intensifier that constitutes ...
  • Characterization of adaptive optics mirrors using long yrace profilometer 
    Saxena, A. K; Chinnappan, V; Ismail Jabilullah, R (Anita Publications, 2004-12)
    A Long Trace Profilometer (LTP) was designed and fabricated in-house primarily to measure the profile of long, non-circularly symmetric grazing incidence optics. This system was used to calibrate the tip-tilt and deformable ...
  • Characterization of aerosol optical properties over the high-altitude station Hanle, in the trans-Himalayan region 
    Shantikumar, N. S; Bagare, S. P; Sinha, N; Rajendra, B. S; Srivastava, A. K; Larson, E; Kanawade, V. P (Elsevier B.V, 2014-03-01)
    Optical properties of aerosols over Hanle (4500 m amsl) in the western Himalayas were studied using skyradiometer observations during October 2007 to December 2010. Yearly mean value of aerosol optical depth (AOD) at 500 ...
  • Characterization of hot populations of Melotte 66 open cluster using Swift/UVOT 
    Rao, Khushboo K; Vaidya, Kaushar; Agarwal, Manan; Panthi, Anju; Jadhav, Vikrant V (Oxford University Press on behalf of Royal Astronomical Society, 2022-10)
    Ultraviolet (UV) wavelength observations have made a significant contribution to our understanding of hot stellar populations of star clusters. Multiwavelength spectral energy distributions (SEDs) of stars, including ...
  • Characterization of MOEMS-based adaptive mirror for wavefront correction 
    Chinnappan, V; Saxena, A. K; Sreenivasan, A (Astronomical Society of India, 2002-09)
    In real-time wavefront compensation techniques, a conjugate surface of the incoming aberrated wavefront is to be created in real-time. Two types of mirrors are used for this purpose. The first one is a tip-tilt mirror ...
  • Characterization of sites for Indian large optical telescope project 
    Parihar, P. S; Sharma, T. K; Surendran, A; Kemkar, P. M. M; Dadul; Stanzin, U; Anupama, G. C (IOP Publishing, 2015-04)
    Growing Indian astronomical community require access to large observing facility preferably located within the country. Site surveys carried out in the post indicates that the best sites for optical-NIR astronomy can better ...
  • 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 ...
  • Characterization of the Atmosphere of Extrasolar Planets 
    Sengupta, Soumya (Indian Institute of Astrophysics, 2022-05)
    Context: Starting from the first discovery of extrasolar planet or exoplanet around a sun-like star, more than 5,000 confirmed exoplanets have been detected till now. But still we have very less information and interpretations ...
  • Characterization of the bent F-state of the CaOh radical by the H-v 
    Chaudhuri, R. K; Freed, K. F; Abrash, S. A; Potts, D. M (Elsevier, 2001-08)
    Although ab initio many-body methods can provide accurate predictions for most small systems, substantial effort is devoted to design and develop fairly accurate and computationally efficient ‘packageable’ methods for ...
  • Characterization of the HD 219134 multi-planet system I. Observations of stellar magnetism, wind, and high-energy flux 
    Folsom, C. P; Fossati, L; Wood, B. E; Sreejith, A. G; Cubillos, P. E; Vidotto, A. A; Alecian, E; Girish, V; Lichtenegger, H; Murthy, J; Petit, P; Valyavin, G (Oxford University Press on behalf of the Royal Astronomical Society, 2018-12)
    HD 219134 hosts several planets, with seven candidates reported, and the two shortest period planets are rocky (4–5 M⊕) and transit the star. Here, we present contemporaneous multiwavelength observations of the star ...
  • Characterization of the HD 219134 multi-planet system II. Stellar-wind sputtered exospheres in rocky planets b & c 
    Vidotto, A. A; Lichtenegger, H; Fossati, L; Folsom, C. P; Wood, B. E; Murthy, J; Petit, P; Sreejith, A. G; Valyavin, G (Oxford University Press on behalf of the Royal Astronomical Society, 2018-12)
    We present a 3D study of the formation of refractory-rich exospheres around the rocky planets HD219134b and c. These exospheres are formed by surface particles that have been sputtered by the wind of the host star. The ...
  • Characterization of the HD 219134 multi-planet system II. Stellar-wind sputtered exospheres in rocky planets b & c 
    Vidotto, A. A; Lichtenegger, H; Fossati, L; Folsom, C. P; Wood, B. E; Murthy, J; Petit, P; Sreejith, A. G; Valyavin, G (Oxford University Press on behalf of the Royal Astronomical Society, 2018-12)
    We present a 3D study of the formation of refractory-rich exospheres around the rocky planets HD219134b and c. These exospheres are formed by surface particles that have been sputtered by the wind of the host star. The ...
  • Characterization of X-ray flare properties of AB Dor 
    Lalitha, S (International Astronomical Union, 2015-08)
    The strong similarities between the flares observed on the Sun and in low mass stars has raised question regarding dynamo in these stars. Using the Sun as a prototype, one may be able to address this. In this paper, we ...
  • Characterizing image quality of solar ultraviolet imaging telescope on board Aditya L1- mission and long- term study of the sun 
    Chatterjee, Subhamoy (Indian Institute of Astrophysics, 2019-03)
    Spatially resolved solar near ultraviolet (NUV, 200-400 nm) observation is important to understand the coupling between different layers of solar atmosphere and its impact on Earth’s climate. Again, solar features in NUV ...
  • Characterizing Solar Eruptions in Inner Corona using Ground and Space-based Data 
    Ritesh, Patel (Indian Institute of Astrophysics, 2021-08)
    The solar corona is known to be associated with eruptions of large amount of magnetized plasma into the interplanetary space. In-spite of several years of ground- and space-based observations of the solar atmosphere, the ...
  • Characterizing Spectral Channels of Visible Emission Line Coronagraph of Aditya-L1 
    Ritesh Patel; Megha, A; Shrivastav, Arpit Kumar; Pant, V; Vishnu, M; Sankarasubramanian, K; Banerjee, D (Frontiers, 2021-06)
    Aditya-L1 is India’s first solar mission with the Visible Emission Line Coronagraph (VELC), which consists of three spectral channels taking high-resolution spectroscopic observations of the inner corona up to 1.5 Rʘ at ...
  • Characterizing the companion AGBs using surface chemical composition of barium stars 
    Shejeelammal, J; Goswami, A; Goswami, P. P; Rathour, R. S; Masseron, T (Oxford University Press on behalf of the Royal Astronomical Society, 2020-10)
    Barium stars are one of the important probes to understand the o rigin and evolution of slow neutron-capture process elements in the Galaxy. These are e xtrinsic stars, where the observed s-process element abundances ...
  • Characterizing the Optical Nature of the Blazar S5 1803+784 during Its 2020 Flare 
    Agarwal, A; Pandey, Ashwani; Ozdonmez, Aykut; Ege, Ergun; Avik, Kumar Das; Volkan, Karakulak (IOP Publishing, 2022-07-01)
    We report the results from our study of the blazar S5 1803+784 carried out using quasi-simultaneous B, V, R, and I observations from 2020 May to 2021 July on 122 nights. Our observing campaign detected a historically bright ...
  • Characterizing the Ordinary Broad-line Type Ic SN 2023pel from the Energetic GRB 230812B 
    Srinivasaragavan, Gokul P; Swain, Vishwajeet; O’Connor, Brendan; Anand, Shreya; Ahumada, Tomás; Perley, Daniel; Stein, Robert; Sollerman, Jesper; Fremling, Christoffer; Cenko, S. Bradley; Antier, S; Guessoum, Nidhal; Hussenot-Desenonges, Thomas; Hello, Patrice; Lesage, Stephen; Hammerstein, Erica; Miller, M. Coleman; Andreoni, Igor; Bhalerao, Varun; Bloom, Joshua S; Dutta, Anirban; Gal-Yam, Avishay; Hinds, K-Ryan; Jaodand, Amruta; Kasliwal, Mansi; Kumar, Harsh; Kutyrev, Alexander S; Ragosta, Fabio; Ravi, Vikram; Sharma, Kritti; Teja, Rishabh Singh; Yang, Sheng; Anupama, G. C; Bellm, Eric C; Coughlin, Michael W; Mahabal, Ashish A; Masci, Frank J; Pathak, Utkarsh; Purdum, Josiah; Roberts, Oliver J; Smith, Roger; Wold, Avery (American Astronomical Society, 2024-01-10)
    We report observations of the optical counterpart of the long gamma-ray burst (GRB) GRB 230812B and its associated supernova (SN) SN 2023pel. The proximity (z = 0.36) and high energy (Eγ,iso ∼ 1053 erg) make it an important ...
  • Charged particle trajectories in a toroidal magnetic and rotation-induced electric field around a black hole 
    Sengupta, S (World Scientific Publishing Company, 1997-10)
    Trajectories of charged particles in a combined poloidal, toroidal magnetic field and a rotation-induced unipolar electric field superposed on a Schwarzschild background geometry have been investigated extensively in the ...

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