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  • The long-active afterglow of GRB 210204A: detection of the most delayed flares in a gamma-ray burst 
    Kumar, Harsh; Gupta, Rahul; Saraogi, Divita; Ahumada, Tomás; Andreoni, Igor; Anupama, G. C; Aryan, Amar; Barway, Sudhanshu; Bhalerao, Varun; Chandra, Poonam; Coughlin, Michael W; Dimple; Dutta, Anirban; Ghosh, Ankur; Ho, Anna Y. Q; Kool, E. C; Kumar, Amit; Medford, Michael S; Misra, Kuntal; Pandey, Shashi B; Perley, Daniel A; Riddle, Reed; Ror, Amit Kumar; Setiadi, Jason M; Yao, Yuhan (Oxford University Press on behalf of Royal Astronomical Society, 2022-06)
    We present results from extensive broadband follow-up of GRB 210204A over the period of 30 d. We detect optical flares in the afterglow at 7.6 × 105 s and 1.1 × 106 s after the burst: the most delayed flaring ever detected ...
  • Long-lived atmospheric trace gases measurements in flask samples from three stations in India 
    Lin, X; Indira, N. K; Ramonet, M; Delmotte, M; Ciais, P; Bhatt, B. C; Reddy, M. V; Angchuk, D; Balakrishnan, S; Jorphail, S; Dorjai, T; Mahey, T. T; Patnaik, S; Begum, M; Brenninkmeijer, C; Durairaj, S; Kirubagaran, R; Schmidt, M; Swathi, P. S; Vinithkumar, N. V; Kwok, C. Y; Gaur, V. K (Published by Copernicus Publications on behalf of the European Geosciences Union, 2015-03)
    With the rapid growth in population and economic development, emissions of greenhouse gases (GHGs) from the Indian subcontinent have sharply increased during recent decades. However, evaluation of regional fluxes of GHGs ...
  • Long-period intensity oscillations of the quiet solar atmosphere from TRACE 1600 Å continuum observations 
    Kariyappa, R; Damé, L (Societa Astronomica Italiana, 2010)
    We have analysed a 6-hour long time sequence of ultraviolet (uv) images obtained on May 24, 2003 in 1600 Å continuum under high spatial and temporal resolutions from the Transition Region and Coronal Explorer (TRACE). ...
  • Long-period oscillations of the sun's interior 
    Davila, J. M; Chitre, S. M (Astronomical Society of India, 1996)
    The long-period modes of a differentially rotating, solar-type star are consided. Two modes are found. The non-axisymmetric modes are Rossby waves, also known as r-modes, with the Coriolis force as the dominant restoring ...
  • Long-term (1995–2018) aerosol optical depth derived using ground based AERONET and SKYNET measurements from aerosol aged-background sites 
    Shantikumar, N. S; Larson, E. J. L; Dumka, U. C; Estelles, Victor; Campanelli, M; Steve, Colwell (Elsevier B.V., 2019-03)
    We examined long-term aerosol optical depth (AOD) trends over 53 sites across the globe which comprise 49 sites from the Aerosol Robotic Network (AERONET) and 4 sites from the Sky radiometer Network (SKYNET) during 1995–2018. ...
  • Long-term (2008–2018) aerosol properties and radiative effect at high-altitude sites over western trans-Himalayas 
    Dumka, U. C; Shantikumar, N. S; Kaskaoutis, D. G; Madhavan, B. L; Song, H. -J; Angchuk, D; Jorphail, S (Elsevier B. V, 2020-09-10)
    Analysis of the climatology of aerosol properties is performed over Hanle (4500 m) and Merak (4310 m), two remote-background sites in the western trans-Himalayas, based on eleven years (2008–2018) of sun/sky radiometer ...
  • Long-term datasets for the understanding of solar and stellar magnetic cycles 
    Banerjee, D (editor); Jiang, J (editor); Kusano, K (editor); Solanki, S (editor) (Cambridge University Press, 2018)
  • Long-term Evolution of Magnetic Field Proxies as Deduced from Archival Data 
    Banerjee, D; Bibhuti Kumar Jha; Mandal, Sudip; Chatterjee, Subhamoy; Hegde, M; KoSO Digitization Team (Cambridge University Press on behalf of International Astronomical Union, 2023)
    Regular observations of the solar magnetic field are available only for about the last five cycles. Thus, to understand the origin of the variation of the solar magnetic field, it is essential to reconstruct the magnetic ...
  • Long-term Evolution of the Sun's Magnetic Field during Cycles 15-19 Based on Their Proxies from Kodaikanal Solar Observatory 
    Mordvinov, A. V; Binay Karak, B; Banerjee, D; Chatterjee, S; Golubeva, E. M; Khlystova, A. I (IOP Publishing, 2020-10-10)
    The regular observation of the solar magnetic field is available only for about the last five cycles. Thus, to understand the origin of the variation of the solar magnetic field, it is essential to reconstruct the magnetic ...
  • Long-Term Monitoring of Blazar PKS 0208-512: A Change of γ-Ray Baseline Activity from EGRET to Fermi Era 
    Ammenadka, Krishna Mohana; Bhattacharya, Debbijoy; Bhattacharyya, Subir; Bhatt, N; Stalin, C. S (Multidisciplinary Digital Publishing Institute, 2022-10)
    The blazar PKS 0208-512 was in the lowest 𝛾 -ray brightness state during the initial 10 years of observations with the Fermi Gamma-ray Space Telescope (Fermi), which was an order of magnitude lower than its flux state ...
  • Long-term optical and infrared variability characteristics of Fermi blazars 
    Safna, P. Z; Stalin, C. S; Rakshit, S; Mathew, Blesson (Oxford University Press on behalf of the Royal Astronomical Society, 2020-11)
    We present long-term optical and near-infrared flux variability analysis of 37 blazars detected in the γ-ray band by the Fermi Gamma-Ray Space Telescope. Among them, 30 are flat spectrum radio quasars (FSRQs) and 7 are BL ...
  • Long-term optical flux and colour variability in quasars 
    Sukanya, N; Stalin, C. S; Jeyakumar, S; Praveen, D; Dhani, A; Damle, R (IOP Publishing, 2016-02)
    We have used optical V and R band observations from the Massive Compact Halo Object (MACHO) project on a sample of 59 quasars behind the Magellan ic clouds to study their long term optical flux and colour ...
  • Long-term photometric variations of the active RS CVn binaries DM UMa and II Peg 
    Mohin, S; Raveendran, A. V; Mekkaden, M. V (International Astronomical Union, 1995)
  • Long-term polarimetric behaviour of the carbon Mira R Leporis 
    Raveendran, A. V; Kameswara Rao, N (European Southern Observatory, 1989-05)
    BVRI polarimetry of R Lep obtained during 1984-1987 shows large changes in the normalized wavelength dependence of polarization. It is found that both the amount and position angle of polarization had components which ...
  • Long-term study of Mkn 421 with the HAGAR array of telescopes 
    Sinha, A; Shukla, A; Saha, L; Acharya, B. S; Anupama, G. C; Bhattacharjee, P; Britto, R. J; Chitnis, V. R; Prabhu, T. P; Singh, B. B; Vishwanath, P. R (EDP Sciences, 2016-07)
    Context. The HAGAR Telescope Array at Hanle, Ladakh has been regularly monitoring the nearby blazar Mkn 421 for the past seven years. Aims. Blazars show flux variability in all timescales across the electromagnetic ...
  • Long-term Study of the Solar Filaments from the Synoptic Maps as Derived from a H Spectroheliograms of the Kodaikanal Observatory 
    Chatterjee, Subhamoy; Hegde, M; Banerjee, D; Ravindra, B (IOP Publishing, 2017-11)
    The century long ( 1914 – 2007 ) a H ( 656.28 nm ) spectroheliograms from the Kodaikanal Solar Observatory ( KSO ) have been recently digitized. Using these newly calibrated, processed images we study the ...
  • Long-term study of the starspot activity on the eclipsing short-period RS Canum Venaticorum binary UV Piscium 
    Radhika, P; Vivekananda Rao, P (Astronomical Society of India, 2001)
    We present optical photometry of the short-period eclipsing RS CVn system, UV Piscium for the years 1966-1984. For each light curve, we model the distortion waves in order to study the behaviour of starspots in this system. ...
  • Long-term temporal variations in the areas of sunspot groups 
    Javaraiah, J (Elsevier, 2013-09-01)
    Recently, we analyzed the combined Greenwich and Solar Optical Observing Network (SOON) sunspot group data during the period 1874-2011 and studied variations in the annual numbers of small, large and big sunspot groups. ...
  • Long-term ultraviolet variability of Seyfert galaxies 
    Sukanya, N; Stalin, C. S; Joseph, P; Rakshit, S; Praveen, D; Damle, R (Indian Academy of Sciences, 2018-12)
    Flux variability is one of the defining characteristics of Seyfert galaxies, a class of active galactic nuclei (AGN). Although these variations are observed over a wide range of wavelengths, results on their flux variability ...
  • Long-term ultraviolet variability of Seyfert galaxies 
    Sukanya, N; Stalin, C. S; Joseph, P; Rakshit, S; Praveen, D; Damle, R (Indian Academy of Sciences, 2018-12)
    Flux variability is one of the defining characteristics of Seyfert galaxies, a class of active galactic nuclei (AGN). Although these variations are observed over a wide range of wavelengths, results on their flux variability ...

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