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Browsing IIAP Publications by Title

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  • Intensity profile of light scattered from a rough surface 
    Chatterjee, S; Vani, V. C; Banyal, R. K (Optical Society of America, 2013-08-20)
    We present in this paper, approximate analytical expressions for the intensity of light scattered by a rough surface, whose elevation ξ x; y in the z-direction is a zero mean stationary Gaussian random variable. With ...
  • Intensity variation in sunspots 
    Ananthakrishnan, R (Nature Publishing Group, 1951-08)
    The most conspicuous and readily observed feature of a normal sunspot is a dark central umbra surrounded by a less dark penumbral fringe which, under good seeing conditions, appears to be composed of converging filaments ...
  • Intensity Weighted Noise Reduction in MEMS Based Deformable Mirror Images 
    Roopashree, M. B; Vyas, A; Prasad, B. R (American Institute of Physics, 2011-10)
    The frames captured with a compact, high-resolution, monochrome progressive scan CCD camera, of a continuous facesheet microelectromechanical systems (MEMS) deformable mirror (DM), include unwanted diffractive, background ...
  • Inter-planetary magnetic-field and equatorial ionosphere 
    Sastri, J. H (European Geophysical Society, 1980)
  • Interacting system NGC 7805/6 (Arp 112) and its tidal dwarf galaxy candidate 
    Fu, Zhen-Xing; Sengupta, Chandreyee; Ramya, S; Pradhan, Bikram; Singh, Mridweeka; Misra, K; Scott, Tom. C; Ma, Yin-Zhe (IOP Publishing, 2021-02)
    We present results from our Giant Metrewave Radio Telescope (GMRT) Hi, Himalayan Chandra Telescope (HCT) Hα, 1 m Sampurnanand Telescope (ST) and 1.3 m Devasthal Fast Optical Telescope (DFOT) deep optical observations of ...
  • The interaction principle in radiative transfer 
    Peraiah, A (D. Reidel Publishing Co., 1984-10)
    We describe the interaction principle which is of fundamental importance to the theory of radiative transfer in one-, two-, and three-dimensional geometry. We also describe the practical difficulties associated with this ...
  • Interaction-Free Measurements of the Second Type: Concepts and Proposal for a Feasible Experiment 
    Unnikrishnan, C. S (Springer, 2001-09)
    Wave aspects inherent in quantum physics lead to observable consequences, which are far removed from classical intuition. The possibility of interaction-free measurement is one consequence of quantum wave nature at the ...
  • Interactions of UHE cosmic ray neutrinos with the cosmological neutrino background 
    Sivaram, C; Gandhi, R (International Union of Pure and Applied Physics, 1995)
    Apart from the cosmic microwave radiation background, the standard cosmology predicts a thermal neutrino background with a temperature around 20K. Methods suggested to detect such a background, include anomalous forces ...
  • Interference of the running waves at light bridges of a sunspot 
    Su, J. T; Ji, K. F; Banerjee, D; Cao, W. D; Priya, T. G; Zhao, J. S; Yu, S. J; Ji, H. S; Zhang, M (IOP Publishing, 2016-01-01)
    The observations of chromospheric oscillations of two umbral light bridges (LBs) within a sunspot from NOAA Active Region 12127 are presented. It was found that the running umbral waves with periods of 2.2–2.6 minutes ...
  • Interior and exterior clues of solar activity 
    Turck-Chièze, S; Brun, A. S; Duez, V; García, R. A; Mathis, S; Piau, L; Salabert, D; Pallé, P. L; Jiménez-Reyes, S. J; Mathur, S; Simoniello, R; Robillot, J. M (Springer, 2010)
    Two research paths are described to obtain better understanding of the origin of global solar activity. First, observations with a multichannel resonant spectrometer may reveal the dynamics of the solar core, the tachocline, ...
  • Intermediate luminosity type Iax supernova 2019muj with narrow absorption lines: long-lasting radiation associated with a possible bound remnant predicted by the weak deflagration model 
    Kawabata, Miho; Maeda, Keiichi; Yamanaka, Masayuki; Nakaoka, Tatsuya; Kawabata, Koji S; Aoki, Kentaro; Anupama, G. C; Burgaz, Umut; Anirban Dutta; Isogai, Keisuke; Kino, Masaru; Kojiguchi, Naoto; Kota, Iida; Brajesh Kumar; Kuroda, Daisuke; Maehara, Hiroyuki; Matsubayash, Kazuya; Morihana, Kumiko; Murata, Katsuhiro L; Ohshima, Tomohito; Otsuka, Masaaki; Sahu, D. K; Avinash Singh; Sugitani, Koji; Takahashi, Jun; Takagi, Kengo (Oxford University Press on behalf of the Astronomical Society of Japan, 2021-10)
    We present comprehensive spectroscopic and photometric analyses of the intermediate luminosity type Iax supernova (SN Iax) 2019muj based on multi-band datasets observed through the framework of the OISTER target-of-opportunity ...
  • Intermediate Mass Black Holes: Their Motion and Associated Energetics 
    Sivaram, C; Arun, K (Hindawi Publishing Corporation, 2014)
    There is a lot of current astrophysical evidence and interest in intermediate mass black holes (IMBH), ranging from a few hundred to several thousand solar masses.The active galaxy M82 and the globular cluster G1 in M31, ...
  • The intermediate polar cataclysmic variable GK Persei 120 years after the nova explosion: a first dynamical mass study 
    Alvarez-Hernandez, A; Torre, M. A. P; Rodriguez-Gil, P; Shahbaz, T; Anupama, G. C; Gazeas, K. D; Pavana, M; Raj, A; Hakala, P; Stone, G; Gomez, S; Jonker, P. G; Ren, J.- J; Cannizzaro, G; Pastor-Marazuela, I; Goff, W; Corral-Santana, J. M; Sabo, R (Oxford University Press on behalf of Royal Astronomical Society, 2021-11)
    We present a dynamical study of the intermediate polar and dwarf nova cataclysmic variable GK Persei (Nova Persei 1901) based on a multisite optical spectroscopy and R-band photometry campaign. The radial velocity curve ...
  • The Intermediate Polar PQ GEM -- Status of Wet Observations of 1996 
    Marar, T. M. K; Seetha, S; Ashoka, B. N; Kasturirangan, K; Mahra, H. S; Bhattacharyya, J. C; Leibowitz, E. M; Hemar, S; Mendelson, H; Ibbetson, P. A; O'Donoghue, D; Buckley, D. A. H; Breger, M; Handler, G; Sperl, M; Serkowitsch, E; Moskalik, P; Zola, S; Pajdosz, G; Krzesinski, J; Silvotti, R; Vauclair, G; Dolez, N; Solheim, J. E; Pfeiffer, B; Kepler, S. O; Kanaan, A; Provencal, J; Kawaler, S. D; O'Brien, M. S; Nather, R. E; Winget, D. E; Kleinman, S; Nitta, A; Bradley, P. A; Guzik, J. A; Clemens, C; Sullivan, D. J; Jiang, X (Baltic Astronomy, 1998-03)
    A summary of the results on PQ Gem based on WET observations conducted in February 1996 is presented. The 13.9 min spin period of the white dwarf in the system and the orbital side-band at 14.5 min have been detected ...
  • Intermediate-luminosity Type IIP SN 2021gmj: a low-energy explosion with signatures of circumstellar material 
    Murai, Yuta; Tanaka, Masaomi; Kawabata, Miho; Taguchi, Kenta; Teja, Rishabh Singh; Nakaoka, Tatsuya; Maeda, Keiichi; Kawabata, Koji S; Nagao, Takashi; Moriya, Takashi J; Sahu, D. K; Anupama, G. C; Tominaga, Nozomu; Morokuma, Tomoki; Imazawa, Ryo; Inutsuka, Satoko; Isogai, Keisuke; Kasuga, Toshihiro; Kobayashi, Naoto; Kondo, Sohei; Maehara, Hiroyuki; Mori, Yuki; Niino, Yuu; Ogawa, Mao; Ohsawa, Ryou; Okumura, Shin-ichiro; Saito, Sei; Sako, Shigeyuki; Takahashi, Hidenori; Uno, Kohki; Yamanaka, Masayuki (Oxford University Press on behalf of Royal Astronomical Society, 2024-03)
    We present photometric, spectroscopic, and polarimetric observations of the intermediate-luminosity Type IIP supernova (SN) 2021gmj from 1 to 386 d after the explosion. The peak absolute V-band magnitude of SN 2021gmj is ...
  • Internal and foreground reddening maps of the Magellanic Clouds 
    Subramaniam, A; Subramanian, S (Astronomical Society of India, 2010)
    We present the internal and foreground reddening maps of the Large and Small Magellanic Clouds. These are estimated using the red clump stars identified from the OGLE III catalog. The foreground reddening is estimated ...
  • Internal kinematics of open star clusters 
    Sagar, R; Bhatt, H. C (Royal Astronomical Society, 1989-02)
    Proper motion measurements are employed to investigate the internal kinematics of eight open star clusters. In most of the clusters considered, no dependence of the intrinsic dispersion in proper motion on stellar mass and ...
  • Internal Rotation of AB Doradus 
    Hiremath, K. M (International Astronomical Union, 2000)
    Using Chandrasekhar's MHD equations, we solve for the steady part of the internal rotation of AB Doradus. We estimate the size of the convective envelope to be ~40% of the radius and the rotation velocity at the base to ...
  • An internally consistent set of oscillator strengths for Fe I lines 
    Giridhar, S; Ferro, A. A (Indian Academy of Sciences, 1989-03)
    An extensive set of internally consistent oscillator strength values for Fe I lines is compiled using literature data and scaling the oscillator strengths derived by different workers to that of Blackwell and his coworkers. ...
  • Interplanetary magnetic field and equatorial ionosphere 
    Sastri, J. H (European Geophysical Society, 1980-06)
    Relationships between events in the interplanetary magnetic field and the equatorial ionosphere are investigated. Simultaneous data showing sudden northward transitions of the interplanetary magnetic field and nighttime ...

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