IIA Institutional Repository: Recent submissions

  • AstroSat Study of the Globular Cluster NGC 2298: Probable Evolutionary Scenarios of Hot Horizontal Branch Stars 
    Rani, Sharmila; Pandey, G; Subramaniam, A; Chung, Chul; Sahu, S; Kameswara Rao, N (IOP Publishing, 2021-12-20)
    We present the far-UV (FUV) photometry of images acquired with UVIT on AstroSat to probe the horizontal branch (HB) population of the Galactic globular cluster NGC 2298. UV-optical color–magnitude diagrams (CMDs) are ...
  • Geometrical meaning of statistical isotropy of smooth random fields in two dimensions 
    Pravabati, C; Goyal, Priya; Yogendran, K. P; Appleby, Stephen (American Physical Society, 2021-12)
    We revisit the geometrical meaning of statistical isotropy that is manifest in excursion sets of smooth random fields in two dimensions. Using the contour Minkowski tensor, W1, as our basic tool we first examine geometrical ...
  • Outbursts of Comet 67P/Churyumov-Gerasimenko 
    Sharma, Kritti; Kelley, Michael S. P; Joharle, Simran; Kumar, Harsh; Swain, Vishwajeet; Bhalerao, Varun; Anupama, G. C; Barway, Sudhanshu (IOP Publishing, 2021-12)
    We monitored the comet 67P/Churyumov-Gerasimenko close to its perihelion in November 2021 with the GROWTH-India Telescope. We observed two outbursts of this comet on 2021 October 29.940 and November 17.864 UTC, -3.12 days ...
  • Evolution of Kelvin–Helmholtz Instability in the Fan-spine Topology 
    Mishra, S. K; Singh, Balveer; Srivastava, A. K; Kayshap, Pradeep; Dwivedi, B. N (IOP Publishing, 2021-12-10)
    We use multiwavelength imaging observations from the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory to study the evolution of the Kelvin–Helmholtz (K–H) instability in a fan-spine magnetic field ...
  • Origin of the Solar Rotation Harmonics Seen in the EUV and UV Irradiance 
    Giono, G; Zender, J. J; Kariyappa, R; Dame, L (Springer, 2021-11)
    Long-term periodicities in the solar irradiance are often observed with periods proportional to the solar rotational period of 27 days. These periods are linked either to some internal mechanism in the Sun or said to be ...
  • The structure and characteristic scales of the H I gas in galactic disks 
    Dib, Sami; Braine, Jonathan; Maheswar, G; Lara-López, Maritza A; Kravtsov, Valery V; Archana Soam; Sharma, Ekta; Zhukovska, Svitlana; Aouad, Charles; Belinchón, José Antonio; Helou, George; Li, Di (EDP Sciences, 2021-11)
    The spatial distribution of the H I gas in galactic disks holds important clues about the physical processes that shape the structure and dynamics of the interstellar medium (ISM). The structure of the ISM could be affected ...
  • Tracing the magnetic field morphology of the LDN 1172/1174 cloud complex 
    Saha, Piyali; Maheswar, G; Sharma, Ekta; Lee, Chang Won; Ghosh, Tuhin; Kim, Shinyoung (EDP Sciences, 2021-11)
    Context. The LDN 1172/1174 cloud complex in the Cepheus Flare region presents a hub-filament structure with the reflection nebula, NGC 7023, illuminated by a Herbig Be star, HD 200775, which consists of the hub with a ~5 ...
  • The metal-poor end of the Spite plateau. II. Chemical and dynamical investigation 
    Pinto, A. M. Matas; Spite, M; Caffau, E; Bonifacio, P; Sbordone, L; Sivarani, T; Steffen, M; François, P; Di Matteo, P (EDP Sciences, 2021-10)
    Context. The study of old, metal-poor stars deepens our knowledge on the early stages of the universe. In particular, the study of these stars gives us a valuable insight into the masses of the first massive stars and their ...
  • Study of classical Be stars in open clusters older than 100 Myr 
    Jagadeesh, Madhu Kashyap; Blesson, Mathew; Paul, K. T; Banerjee, Gourav; Subramaniam, A; Arun, R (Springer, 2021-10)
    We performed the slitless spectroscopic survey to identify classical Be (CBe) stars in open clusters older than 100 Myr. Observing a sample of 71 open clusters, we identified 13 CBe stars in 11 open clusters, one of, ...
  • Magnetic Structure in Successively Erupting Active Regions: Comparison of Flare-Ribbons With Quasi-Separatrix Layers 
    Vemareddy, P (Frontiers, 2021-10)
    This paper studies the magnetic topology of successively erupting active regions (ARs) 11,429 and 12,371. Employing vector magnetic field observations from Helioseismic and Magnetic Imager, the pre-eruptive magnetic ...
  • Impacts of Aerosol Loading in the Hindu Kush Himalayan Region Based on MERRA-2 Reanalysis Data 
    Shantikumar, N. S; Dumka, Umesh Chandra; Mugil, Sivasamy Kalamani; Kuniyal, Jagdish Chandra; Hooda, Rakesh K; Gautam, Alok Sagar; Tiwari, Suresh (MDPI, 2021-10)
    The impacts of climate change have severely affected geosphere, biosphere and cryosphere ecosystems in the Hindu Kush Himalayan (HKH) region. The impact has been accelerating further during the last few decades due to rapid ...
  • The Prominence Driven Forced Reconnection in the Solar Corona and Associated Plasma Dynamics 
    Srivastava, A. K; Mishra, S. K; Jelínek, P (IOP Publishing, 2021-10-01)
    Using the multitemperature observations from SDO/AIA on 2019 December 30, we provide a signature of prominence driven forced magnetic reconnection in the corona and associated plasma dynamics from 09:20 UT to 10:38 UT. ...
  • Solar Cycle Evolution of Filaments over a Century: Investigations with the Meudon and McIntosh Hand-drawn Archives 
    Mazumder, Rakesh; Chatterjee, Subhamoy; Nandy, Dibyendu; Banerjee, D (IOP Publishing, 2021-10-01)
    Hand-drawn synoptic maps from the Meudon Observatory (1919 onwards) and the McIntosh archive (1967 onwards) are two important sources of long-term, manually recorded filament observations. In this study, we calibrate the ...
  • The total solar eclipse in the Bhagavata: its depiction in words and in images 
    Kapoor, R. C (Centre for Astronomy Research & Development, 2021-12)
    There is reference to a total solar eclipse over Kurukshetra in an ancient Indian text, the Srimadbhagvata (also the Bhagavata). The occasion drew not just Lord Krsṇa, his brother Balarama and their clan from Dwarka, but ...
  • Solar eclipses in India’s cultural and political history 
    Kapoor, R. C (Cambridge University Press, 2021-12)
    This contribution presents earliest records in the Indian stone inscriptions and literature that specifically mention the eclipse as total or annular and the eclipses that timed with wars. Solar cult temples can be found ...
  • GROWTH-India Observations of Solar System Objects 
    Sharma, Kritti; Kumar, Harsh; Bolin, Bryce; Bhalerao, Varun; Anupama, G. C; Barway, Sudhanshu (Europlanet Science Congress, 2021-09)
    The discovery, characterisation, and monitoring of Near-Earth Objects (NEOs) are critical for understanding and potentially mitigating the long-term threats to our civilisation from Potential Hazardous Asteroids (PHAs). ...
  • Star formation around three co-moving HAeBe stars in the Cepheus Flare 
    Saha, Piyali; Maheswar, G; Mathew, B; Kamath, U. S (EDP Sciences, 2021-09)
    The presence of three more Herbig Ae/Be (HAeBe) candidates in the Cepheus Flare within a 1.5° radius centered on HD 200775 suggests that star formation is prevalent in a wider region of the LDN 1147/1158, LDN 1172/1174, ...
  • Segmentation of Coronal Features to Understand the Solar EUV and UV Irradiance Variability III. Inclusion and Analysis of Bright Points 
    Zwaard, Rens van der; Bergmann, Matthias; Zender, ·Joe; Kariyappa, R; Giono, Gabriel; Dame, Luc (Springer, 2021-09)
    The study of solar irradiance variability is of great importance in heliophysics, Earth’s climate, and space weather applications. These studies require careful identifying, tracking and monitoring of features in the solar ...
  • Radial Sizes and Expansion Behavior of ICMEs in Solar Cycles 23 and 24 
    Mishra, Wageesh; Doshi, Urmi; Srivastava, Nandita (Frontiers, 2021-09)
    We attempt to understand the influence of the heliospheric state on the expansion behavior of coronal mass ejections (CMEs) and their interplanetary counterparts (ICMEs) in solar cycles 23 and 24. Our study focuses on ...
  • Indian Institute of Astrophysics Annual Report: 2020-21 
    Subramaniam, A (Indian Institute of Astrophysics, 2021)

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