IIAP Publications: Recent submissions

  • Strength of the Solar Coronal Magnetic Field A Comparison of Independent Estimates Using Contemporaneous Radio and White-Light Observations 
    Anshu Kumari; Ramesh, R; Kathiravan, C; Wang, T. J (Springer, 2017-11)
    Abstract We estimated the coronal magnetic field strength (B) during the 23 July 2016 coronal mass ejection (CME) event using i) the flux rope structure of the CME in the whitelight coronagraph images and ii) the ...
  • Correlation trends in the hyperfine structures of 210, 212Fr 
    Sahoo, B. K; Nandy, D. K; Das, B. P; Sakemi, Y (The American Physical Society, 2015-04)
    We demonstrate the importance of electron correlation effects in the hyperfine structure constants of many low-lying states in 210Fr and 212Fr. This is achieved by calculating the magnetic dipole and electric quadrupole ...
  • All sky scanning cloud monitor for NLOT site survey 
    Sharma, T. K; Parihar, P. S; Kemkar, P. M. M (IOP Publishing, 2015-05)
    Monitoring local sky for the cloud is one of important task before setting-up a new observatory. Here we present the design, implementation and initial results of a scanning type cloud monitor developed in Indian Institute ...
  • Solar Type IIIb Radio Bursts as Tracers for Electron Density Fluctuations in the Corona 
    Mugundhan, V; Hariharan, K; Ramesh, R (Springer, 2017-11)
    We present an estimation of the electron density modulation index ( δN Nee ) for the first time using solar type IIIb radio burst observations. The mean value of δN Nee is calculated to be ≈ 0.006 ± 0.002 over the ...
  • Constraints on dark matter models from the observation of Triangulum-II with the Fermi Large Area Telescope 
    Biswas, Sayan; Bhattacharjee, P; Majumdar, P; Das, Subinoy; Mousumi Das; Joarder, P. S (IOP Publishing, 2017-11)
    Triangulum-II, a newly discovered dwarf spheroidal galaxy, is a strong candidate for the indirect search of dark matter through the detection of γ -ray emission that could originate from the pair- annihilation ...
  • Multi-wavelength observations of 3C 279 during the extremely bright gamma-ray flare in 2014 March-April 
    Paliya, Vaidehi S; Sahayanathan, S; Stalin, C. S (IOP Publishing, 2015-04)
    The well-studied blazar 3C 279 underwent a giant γ-ray outburst in 2014 March–April. The measured γ-ray flux is the highest detected from 3C 279 by the Fermi Large Area Telescope. Hour scale γ-ray flux variability is ...
  • Awakening of the high-redshift blazar CGRaBS J0809+5341 
    Paliya, Vaidehi S; Parker, M. L; Stalin, C. S; Fabian, A. C; Ramya, S; Covino, S; Tagliaferri, G; Sahayanathan, S; Ravikumar, C. D (IOP Publishing, 2015-04)
    CGRaBS J0809+5341, a high-redshift blazar at z = 2.144, underwent a giant optical outburst on 2014 April 19 when it brightened by ~5 mag and reached an unfiltered apparent magnitude of 15.7 mag. This implies an absolute ...
  • Constraint on noncommutative spacetime from PLANCK data 
    Joby, P. K; Pravabati, C; Das, Subinoy (The American Physical Society, 2015-04)
    We constrain the energy scale of noncommutativity of spacetime using cosmic microwave background data from PLANCK. We find that PLANCK data put the lower bound on the noncommutativity energy scale to about 20 TeV, which ...
  • Prominence Eruption Initiated by Helical Kink Instability of an Embedded Flux Rope 
    Vemareddy, P; Gopalswamy, N; Ravindra, B (IOP Publishing, 2017-11)
    We study the triggering mechanism of a limb-prominence eruption and the associated coronal mass ejection ( CME ) near AR 12342 using Solar Dynamics Observatory and Large Angle and Spectrometric Coronagraph / Solar ...
  • 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 ...
  • A detailed analysis of barium oxide molecular lines in sunspot umbral spectra 
    Shanmugapriya, G; Karthikeyan, B; Balachandrakumar, K; Rajamanickam, N; Bagare, S. P (Springer, 2015-06)
    It is essential to know the composition of atoms or molecules present in the astrophysical objects concerned to determine the physical and chemical nature of a solar or stellar region. With the aim to identify them clearly, ...
  • A Global Prospective of the Indian Optical and Near-Infrared Observational Facilities in the Field of Astronomy and Astrophysics: A Review 
    Sagar, R (Springer India, 2017-03)
    A review of modernization and growth of ground based optical and near-infrared astrophysical observational facilities in the globe attributed to the recent technological developments in opto-mechanical, electronics and ...
  • Wavelength calibration of a tunable spatial heterodyne spectrometer 
    Nirmal, K; Sridharan, R; Sriram, S; Ambily, S; Mathew, J; Mayuresh, Sarpotdar; Murthy, J; Binukumar, G; Safonova, M (SPIE-The International Society for Optical Engineering, 2018-07-06)
    Spatial Heterodyne Spectroscopy (SHS) is a relatively novel interferometric technique similar to Fourier transform spectroscopy and shares design similarities with a Michelson Interferometer. An Imaging detector is used ...
  • Full Stokes polarimetry using dual-frequency liquid crystals 
    Nagaraju, K; Phanindra, D. V. S; Krishna Prasad, S; Shankar Rao, D. S; Sreekumar, P (SPIE-The International Society for Optical Engineering, 2018-07-06)
    In a dual-frequency liquid crystal (DFLC), when the frequency of the applied voltage is more than a critical value (fc), the dielectric anisotropy of the material changes from positive to negative. This causes the director ...
  • Development of a stabilized fabry-perot based wavelength calibrator for precision doppler spectroscopy 
    Tanya, Das; Banyal, R. K; Kathiravan, S; Sivarani, T; Ravindra, B (SPIE-The International Society for Optical Engineering, 2018-07-06)
    Precision Doppler spectroscopy serves as an important tool for Radial Velocity (RV) observations of stars. High precision spectroscopy is bound by two major challenges, first being the instrument instability which is ...
  • The Horizontal Branch Population of NGC 1851 as Revealed by the Ultraviolet Imaging Telescope (UVIT) 
    Subramaniam, A; Snehalata Sahu; Postma, J; Cote, Patrick; Hutchings, J. B; Darukhanawalla, N; Chung, Chul; Tandon, S. N; Kameswara Rao, N; George, K; Ghosh, S. K; Girish, V; Murthy, J; Mohan, Rekhesh; Murthy, J; Pati, A. K; Sankarasubramanian, K; Stalin, C. S; Choudhury, S (IOP Publishing, 2017-12)
    The Horizontal Branch Population of NGC 1851 as Revealed by the Ultraviolet Imaging Telescope ( UVIT ) Annapurni Subramaniam 1 , Snehalata Sahu 1 , Joseph E. Postma 2 , Patrick Côté 3 , J. B. Hutchings 3 , ...
  • A simplified ab initio treatment of diradicaloid structures produced from stretching and breaking chemical bonds 
    Sinha Ray, Suvonil; Ghosh, A; Shit, Anindita; Chaudhuri, R. K; Chattopadhyay, S (Royal Society of Chemistry Publishing, 2017-09)
    he present investigation reports on the prospect of usi ng state specific multireference perturbation theory (SSMRPT) with an improved virtual orbital complete ac tive space configuration interaction (IVO-CASCI) reference ...
  • The VMC survey – XIV. first results on the look-back time star formation rate tomography of the small magellanic cloud 
    Rubele, S; Girardi, L; Kerber, L; Cioni, Maria-Rosa. L; Piatti, A. E; Zaggia, S; Bekki, K; Bressan, A; Clementini, G; de Grijs, R; Emerson, J. P; Groenewegen, M. A. T; Ivanov, V. D; Marconi, M; Marigo, P; Moretti, Maria-Ida; Ripepi, V; Subramanian, S; Tatton, B. L; Van Loon, J. T (Oxford University Press on behalf of the Royal Astronomical Society, 2015-05-01)
    We analyse deep images from the VISTA survey of the Magellanic Clouds in the YJKs filters, covering 14 deg2 (10 tiles), split into 120 subregions, and comprising the main body and Wing of the Small Magellanic Cloud (SMC). ...
  • Hanle echelle spectrograph: design and performance 
    Sriram, S; Amit Kumar; Arun Surya; Sivarani, T; Giridhar, S; Kathiravan, S; Anand, M. N; Jones, D; Grobler, D; Jakobsson, R; Anantha, Ch; Athira Unni; Angchuk, D; Tsewang, D; Gyalson, T (SPIE-The International Society for Optical Engineering, 2018-07-06)
    Hanle echelle spectrograph (HESP) is a high resolution, bench mounted, fiber-fed spectrograph at visible wavelengths. The instrument was recently installed at the 2m Himalayan Chandra Telescope (HCT), located at Indian ...
  • The high-redshift blazar S5 0836+71: a broadband study 
    Paliya, Vaidehi S (IOP Publishing, 2015-05-01)
    A broadband study of the high-redshift blazar S5 0836+71 (z = 2.172) is presented. Multi-frequency light curves show multiple episodes of X-ray and γ-ray flares, while optical-UV fluxes show little variations. During the ...

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