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  • Short-term periodicities of the sun's `mean' and differential rotation 
    Javaraiah, J; Komm, R. W (Kluwer Academic Publishers, 1999-01)
    We have looked for periodicities in solar differential rotation on time scales shorter than the 11-year solar cycle through the power- spectrum analysis of the differential rotation parameters determined from Mt. Wilson ...
  • Short-term variations in solar rotation rate and solar wind parameters 
    Georgieva, K; Javaraiah, J; Kirov, B; Atanasov, D (European Space Agency, 2002-12)
    The components of the interplanetary magnetic field (IMF) at the Earth's orbit are described by the model of Parker [1958]. In it, the solar rotation rate is assumed constant. In the present paper we compare in-situ ...
  • Short-timescale γ -Ray Variability in CTA 102 
    Shukla, A; Mannheim, K; Patel, S. R; Roy, J; Chitnis, V. R; Dorner, D; Rao, A. R; Anupama, G. C; Wendel, C (IOP Publishing, 2018-02)
    The fl at-spectrum radio quasar CTA 102 experienced a prolonged state of enhanced activity across the entire observed electromagnetic spectrum during 2016 – 2017, most pronounced during a major outburst between ...
  • Signal processing instrumentation of gamma-ray telescopes of the GRACE project 
    Mukhopadhyay, P. K (Astronomical Society of India, 2002)
    The TACTIC Cerenkov telescope has recently been commissioned at Mount Abu, Rajasthan. The signal processing electrinics of the 349 element imaging camera was a totally indigenous development. A number of groups from ...
  • Signals from Mars 
    Mallik, D. N (Astronomical Society of India, 1920)
  • SIGNALS: I. Survey description 
    Rousseau-Nepton, L; Martin, R. P; Robert, C; Drissen, L; Amram, P; Prunet, S; Martin, T; Moumen, I; Adamo, A; Alarie, A; Barmby, P; Boselli, A; Bresolin, F; Bureau, M; Chemin, L; Fernandes, R. C; Combes, F; Crowder, C; Della Bruna, L; Duarte Puertas, S; Egusa, F; Epinat, B; Ksoll, V. F; Girard, M; Gomez Llanos, V; Gouliermis, D; Grasha, K; Higgs, C; Hlavacek-Larrondo, J; Ho, I.-T; Iglesias-Paramo, J; Joncas, G; Kam, Z. S; Karera, P; Kennicutt, R. C; Klessen, R. S; Lianou, S; Liu, L; Liu, Q; Luiz de Amorim, A; Lyman, J. D; Martel, H; Mazzilli-Ciraulo, B; McLeod, A. F; Melchior, A-L; Millan, I; Molla, M; Momose, R; Morisset, C; Pan, H.-A; Pati, A. K; and 13 co-authors (Oxford University Press on behalf of the Royal Astronomical Society, 2019-11)
    SIGNALS, the Star formation, Ionized Gas, and Nebular Abundances Legacy Survey, is a large observing programme designed to investigate massive star formation and H II regions in a sample of local extended galaxies. The ...
  • Signature of extended solar cycles as detected from Ca ii K synoptic maps of Kodaikanal and Mount Wilson Observatory 
    Chatterjee, Subhamoy; Banerjee, D; McIntosh, S.W; Leamon, Robert J; Dikpati, Mausumi; Srivastava, Abhishek K; Bertello, L (IOP Publishing, 2019-03-20)
    In recent years there has been a resurgence of the study of extended solar cycles (ESCs) through observational proxies mainly in extreme ultraviolet. But most of them are limited only to the space-based era covering only ...
  • Signatures for magnetospheric substorms in the geomagnetic field of dayside equatorial region: Origin of the ionospheric component 
    Sastri, J. H; Kamide, Y; Yumoto, K (American Geophysical Union, 2003-10)
    An event-based study is made of the conditions that lead to the ionospheric current component in the geomagnetic field signature for magnetospheric substorms in the dayside dip equatorial region. The substorm activity ...
  • Signatures of Alfven waves in the polar coronal holes as seen by EIS/Hinode 
    Banerjee, D; Perez-Suarez, D; Doyle, J. G (2009-06-26)
    Context. We diagnose the properties of the plume and interplume regions in a polar coronal hole and the role of waves in the acceleration of the solar wind. Aims. We attempt to detect whether Alfven waves are present in ...
  • Signatures of Light Massive Relics on non-linear structure formation 
    Banerjee, Arka; Das, Subinoy; Maharana, Anshuman; Sharma, R. K (Oxford University Press on behalf of Royal Astronomical Society, 2022-10)
    Cosmologies with Light Massive Relics (LiMRs) as a subdominant component of the dark sector are well-motivated from a particle physics perspective, and can also have implications for the σ8 tension between early and late ...
  • Signatures of the Impact of Flare-Ejected Plasma on the Photosphere of a Sunspot Light Bridge 
    Felipe, T; Collados, M; Khomenko, E; Rajaguru, S. P; Franz, M; Kuckein, C; Asensio Ramos, A (EDP Sciences, 2017-12)
    Aims. We investigate the properties of a sunspot light bridge, focusing on the changes produced by the impact of a plasma blob ejected from a C-class flare. Methods. We observed a sunspot in active region NOAA 12544 ...
  • Signatures of the superfluid–to–Mott-insulator transition in cold bosonic atoms in a one-dimensional optical lattice 
    Ramanan, S; Mishra, T; Luthra, M. S; Pai, R. V; Das, B. P (The American Physical Society, 2009-01)
    We study the Bose-Hubbard model using the finite size density matrix renormalization group method. We obtain a complete phase diagram for a system in the presence of a harmonic trap and compare it with that of the homogeneous ...
  • Signatures of untwisting magnetic field in a small emerging bipole in the solar photosphere 
    Sangeetha, C. R; Tripathi, Durgesh; Rajaguru, S. P (IOP Publishing, 2020-05-20)
    We perform a study of fluid motions and its temporal evolution in and around a small bipolar emerging flux region using observations made by the Helioseismic and Magnetic Imager on board the Solar Dynamics Observatory. We ...
  • Significance of bar quenching in the global quenching of star formation 
    George, K; Subramanian, S; Paul, K. T (EDP Sciences, 2019-08)
    The suppression of star formation in the inner kiloparsec regions of barred disk galaxies due to the action of bars is known as bar quenching. We investigate here the significance of bar quenching in the global quenching ...
  • Silicon depletion in the interstellar medium 
    Haris, U; Parvathi, V. S; Gudennavar, S. B; Bubbly, S. G; Murthy, J; Sofia, U. J (IOP Publishing, 2016-07)
    We report interstellar silicon ( Si ) depletion and dust-phase column densities of Si along 131 Galactic sight lines using archival observations. The data were corrected for differences in the assumed oscillator ...
  • Silver linings in the dark clouds of COVID-19: Improvement of air quality over India and Delhi metropolitan area from measurements and WRF-CHIMERE model simulations 
    Dumka, U. C; Kaskaoutis, D. G; Verma, Shubha; Shantikumar, N. S; Sarvan Kumar; Ghosh, Sanhita (Elsevier B.V., 2021-02)
    The current study examines the impact of the COVID-19 lockdown (25th March until May 17, 2020) period in particulate matter (PM) concentrations and air pollutants (NOx, SO2, CO, NH3, and O3) at 63 stations located at Delhi, ...
  • Similarity solutions for buoyancy induced flows in a saturated porous medium adjacent to impermeable horizontal surfaces 
    Chandrasekhara, B. C; Namboodiri, P. M. S; Hanumanthappa, A. R (Springer, 1984-03)
    In the present paper similarity solutions for the convective flow induced by buoyancy in a saturated porous medium adjacent to horizontal impermeable surfaces are obtained. The analysis incorporates the variation of ...
  • A Simple Digital System Drive for Small Telescopes 
    Bhattacharyya, J. C; Ramamoorthy, K. S; Chandramohan, R (Indian Institute of Astrophysics, Bangalore, 1980)
    A variable stable frequency source employing a crystal oscillator and a programmable digital divider chain is described. The system offers an ideal arrangement for controlling tracking rates of small and medium size ...
  • Simple method of star photography 
    Tomkins (Astronomical Society of India, 1911-03)
  • A simple model for coronal loops and their stability 
    Satya Narayanan, A (European Space Agency, 1999-12)

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