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Browsing IIAP Publications by Title

Browsing IIAP Publications by Title

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  • Temperature variability in X-ray bright points observed with Hinode/XRT 
    Kariyappa, R; DeLuca, E. E; Saar, S. H; Golub, L; Dam´e, L; Pevtsov, A. A; Varghese, B. A (EDP Science, 2011-02)
    Aims. Our aim is to investigate the variability in the temperature as a function of time among a sample of coronal X-ray bright points (XBPs). Methods. We analysed a 7-hour (17:00 UT - 24:00 UT) long time sequence of ...
  • Template-based classification of SDSS-GALEX point sources 
    Anjum, A; Mousumi Das; Murthy, J; Gudennavar, S. B; Rajesh, G; Bubbly, S. G (Indian Academy of Sciences, 2018-10)
    We have classified a sample of 37,492 objects from SDSS into QSOs, galaxies and stars using photometric data over five wave bands (u, g, r, i and z) and UV GALEX data over two wave bands (near-UV and far-UV) based on a ...
  • Temporal and Latitudinal Variations in Ca-K Plage and Network Area: An Implication for Meridional Flows 
    Priyal, M; Singh, J; Ravindra, B; Sindhuja, G (American Astronomical Society, 2023-02-20)
    The Ca-K spectroheliograms obtained at the Kodaikanal observatory are used to generate a uniform time series using the equal-contrast technique for studying the long- and short-term variations in the solar chromosphere. ...
  • Temporal and Latitudinal Variations of the Length-Scales and Relative Intensities of the Chromospheric Network 
    Raju, K. P (Oxford University Press on behalf of the Royal Astronomical Society, 2018-08)
    The Calcium K spectroheliograms of the Sun from Kodaikanal have a data span of about 100 yr and covers over nine solar cycles. The Ca line is a strong chromospheric line dominated by chromospheric network and plages which ...
  • Temporal and spatial variations of the quiet upper chromosphere from SOHO/SUMER observations of hydrogen Lyman lines 
    Kariyappa, R; Varghese, B. A; Curdt, W (EDP Sciences, 2001-08)
    We have analyzed a time series of spectra in the hydrogen Lyman lines and the Lyman continuum obtained by the Solar Ultraviolet Measurements of Emitted Radiation (SUMER) spectrometer on the SOlar Heliospheric Observatory ...
  • Temporal asymmetry in aerosol optical characteristics: A case study at a high-altitude station, Hanle, in Ladakh region 
    Shantikumar, N. S; Bagare, S. P; Srivastava, A. K; Kanawade, V. P; Rajendra, B. S; Padhy, S. K (Elsevier, 2014-12)
    Diurnal features of aerosol optical depth (AOD) at a high-altitude station, Hanle (4500 m amsl) in the western Himalayas, were studied using direct/diffuse solar irradiance measurement from a Skyradiometer (Prede) during ...
  • Temporal behaviour of pressure in solar coronal loops 
    Sasidharan, K; Sreedharan, T. D; Pratap, R; Krishan, V (Springer, 1995-03)
    The temporal evolution of pressure in solar coronal loops is studied using the ideal theory of magnetohydrodynamic turbulence in cylindrical geometry. The velocity and the magnetic fields are expanded in terms of the ...
  • Temporal correlation between the optical and γ-ray flux variations in the blazar 3C 454.3 
    Rajput, Bhoomika; Stalin, C. S; Sahayanathan, S; Rakshit, S; Amit Kumar Mandal (Oxford University Press on behalf of the Royal Astronomical Society, 2019-06)
    Blazars show optical and γ-ray flux variations that are generally correlated, although there are exceptions. Here we present anomalous behaviour seen in the blazar 3C 454.3 based on an analysis of quasi-simultaneous data ...
  • Temporal evolution of main sequence dusty disks 
    Puravankara, M; Bhatt, H. C (Kluwer Academic Publishers, 2003)
  • Temporal Evolutions and Quasiperiodic Variations Present in the Sunspot Number and Group Sunspot Area Data Measured at Kodaikanal Observatory for Solar Cycles 14-24 
    Ravindra, B; Chowdhury, Partha; Ray, Pratap Chandra; Pichamani, Kumaravel (American Astronomical Society, 2022-11-20)
    The Kodaikanal Observatory has made synoptic observations of the Sun in white light since 1904, and these images are sketched on the Stonyhurst grids called Sun charts. These continuous hand-drawn data sets are used for ...
  • Temporal offsets among solar activity indicators 
    Ramesh, K. B; Vasantharaju, N (Springer, 2014-04)
    Temporal offsets between the time series of solar activity indicators provide important clues regarding the physical processes responsible for the cyclic variability in the solar atmosphere. Hysteresis patterns generated ...
  • Temporal variation of Ca-K line profile of the sun during the solar cycle 22 and 23 
    Sindhuja, G; Singh, J (Indian Academy of Sciences, 2015-03)
    We obtained the Ca–K line profile of the Sun as a star since 1969 at the Kodaikanal Observatory (KO) and analysis of the data showed the need to delineate the role of different chromospheric features to the variations ...
  • Temporal Variations of Different Solar Activity Indices through the Solar Cycles 21-23 
    Goker, U. D; Singh, J; Nutku, F; Priyal, M (University of Belgrade, 2017-12)
    SUMMARY: Here, we compare the sunspot counts and the number of sunspot groups (SGs) with variations of total solar irradiance (TSI), magnetic activity, Ca II K-flux, faculae and plage areas. We applied a time series ...
  • Temporal variations of the solar EUV network properties 
    Varghese, B.S; Raju, K. P; Kurian, P. J (Indian Academy of Sciences, 2019-07-11)
    The chromospheric network extended to the transition region as the solar EUV network disperses at the coronal level. The EUV emission lines from the transition region give information about different atmospheric heights. ...
  • Tensor Minkowski Functionals for random fields on the sphere 
    Pravabati, C; Yogendran, K. P; Joby, P. K; Vidhya, G; Appleby, S; Park, C (IOP Publishing, 2017-12)
    We generalize the translation invariant tensor-valued Minkowski Functionals which are defined on two-dimensional flat space to the unit sphere. We apply them to level sets of random fields. The contours enclosing ...
  • Tensor Minkowski Functionals: first application to the CMB 
    Vidhya, G; Pravabati, C (IOP Publishing, 2017-05)
    ensor Minkowski Functionals (TMFs) are tensor generalizations of the usual Minkowski Functionals which are scalar quantities. We introduce them here for use in cos- mological analysis, in particular to analyze ...
  • Tensor polarization of ω produced at threshold in p–p collisions 
    Ramachandran, G; Balasubramanyam, J; Shilpashree, S. P; Padmanabha, G (Institute of Physics, 2007-04)
    It is shown that the dominant decay mode of \vec\omega \to \pi^+ \pi^- \pi^0 can be employed to determine the Fano statistical tensor t20 of \vec \omega with respect to the quantization axis normal to the decay plane. ...
  • Term values of Na-like iron group highly stripped ions using coupled-cluster theory 
    Ray, H (Institute of Physics, 2002-07)
    More accurate term values, a few line strengths and transition probabilities for the E2 transitions of the iron group highly stripped ions Fe XVI, Co XVII and Ni XVIII are reported. We have used the fully relativistic ...
  • The TESS-Keck Survey. VIII. Confirmation of a Transiting Giant Planet on an Eccentric 261 Day Orbit with the Automated Planet Finder Telescope 
    Dalba, Paul A; Kane, Stephen R; Dragomir, Diana; Villanueva Jr, Steven; Collins, Karen A; Jacobs, Thomas Lee; LaCourse, Daryll M; Gagliano, Robert; Kristiansen, Martti H; Omohundro, Mark; Schwengeler, Hans M; Terentev, Ivan A; Vanderburg, Andrew; Fulton, Benjamin; Isaacson, Howard; Zandt, Judah Van; Howard, Andrew W; Thorngren, Daniel P; Howell, Steve B; Batalha, Natalie M; Chontos, Ashley; Crossfield, Ian J. M; Dressing, Courtney D.; Huber, Daniel; Petigura, Erik A.; Robertson, Paul; Roy, Arpita; Weiss, Lauren M; Behmard, Aida; Beard, Corey; Brinkman, Casey L; Giacalone, Steven; Hil, Michelle L; Lubin, Jack; Mayo, Andrew W; Mocnik, Teo; Murphy, Joseph M. Akana; Polanski, Alex S; Rice, Malena; Rosenthal, Lee J; Rubenzahl, Ryan A; Scarsdale, Nicholas; Turtelboom, Emma V; Tyler, Dakotah; Benni, Paul; Boyce, Pat; Esposito, Thomas M; Girardin, E; Laloum, Didier; Lewin, Pablo; Mann, Christopher R; Marchis, Franck; Schwarz, Richard P; Srdoc, Gregor; Steuer, Jana; Sivarani, T; Athira Unni; Eisner, Nora L; Fetherolf, Tara; Li, Zhexing; Yao, Xinyu; Pepper, Joshua; Ricker, George R.; Vanderspek, Roland; Latham, David W; Seager, S.; Winn, Joshua N; Jenkins, Jon M; Burke, Christopher J; Eastman, Jason D; Lund, Michael B; Rodriguez, David R; Rowden, Pamela; Ting, Eric B; Villaseñor, Jesus Noel (American Astronomical Society, 2022-02-01)
    We report the discovery of TOI-2180 b, a 2.8 MJ giant planet orbiting a slightly evolved G5 host star. This planet transited only once in Cycle 2 of the primary Transiting Exoplanet Survey Satellite (TESS) mission. Citizen ...
  • Tessellation of SoHO Magnetograms 
    Srikant, R; Singh, J (Indian Academy of Sciences, 2000-12)
    A gradient based algorithm which divides arbitrary images into non-overlapping surface filling tiles of opposite polarity is used to study the flux and size distributions of large scale magnetic flux concen-trations in ...

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