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Browsing by Author "Banerjee, D"

Browsing by Author "Banerjee, D"

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  • MHD Waves in Coronal Holes 
    Banerjee, D; Krishna Prasad, S (John Wiley & Sons, Inc., 2015-05)
    Coronal holes are the dark patches in the solar corona associated with relatively cool, less dense plasma and unipolar fields. The fast component of the solar wind emanates from these regions. Several observations ...
  • Migration of solar polar crown filaments in the past 100 years 
    Xu, Yan; Banerjee, D; Chatterjee, Subhamoy; Potzi, Werner; Wang, Ziran; Ruan, Xindi; Jing, Ju; Wang, Haimin (IOP Publishing, 2021-03-01)
    Polar crown filaments (PCFs) are formed above the polarity inversion line, which separates unipolar polar fields and the nearest dispersed fields. They are important features in studying solar polar fields and their cyclical ...
  • Multi-wavelength study of a high velocity event near a sunspot 
    Lin, C. -H; Banerjee, D; O`Shea, E; Doyle, J. G (2006-05)
    Context: .Jets with velocities higher than 200 km s-1 are often observed in the X-ray spectral range in the solar atmosphere, however, very few such objects are observed in the EUV range. Aims: .We report on an eruptive ...
  • Multithermal apparent damping of slow waves due to strands with a Gaussian temperature distribution 
    Van Doorsselaere, T; Krishna Prasad, S; Pant, V; Banerjee, D; Hood, A (EDP Sciences, 2024-03)
    Context. Slow waves in solar coronal loops are strongly damped, but the current theory of damping by thermal conduction cannot explain some observational features. Aims. We investigated the propagation of slow waves in a ...
  • Nature of quiet Sun oscillations using data from the hinode, TRACE, and SOHO spacecraft 
    Gupta, G. R; Subramanian, S; Banerjee, D; Madjarska, M. S; Doyle, J. G (Springer, 2013-01)
    We study the nature of quiet-Sun oscillations using multi - wavelength observations from TRACE, Hinode, and SOHO. The aim is to investigate the existence of propagating waves in the solar chromosphere and the transition ...
  • Observational review on global waves 
    Banerjee, D (Cambridge University Press, 2008-05)
    With multi-wavelength observations from ground and space-based instruments it has been possible to detect waves in a number of different wavelengths simultaneously and to, consequently, study their propagation properties. ...
  • Observations of oppositely directed umbral wavefronts rotating in sunspots obtained from the New Solar Telescope of BBSO 
    Su, J. T; Ji, K. F; Cao, W; Banerjee, D; Priya, T. G; Zhao, J. S; Bai, X. Y; Chen, J; Zhang, M; Ji, H. S (IOP Publishing, 2016-02)
    We study the umbral waves as observed by chromospheric imaging observations of two sunspots with the New Solar Telescope at the Big Bear Solar Observatory. We find that the wavefronts (WFs) rotate clockwise and form ...
  • Off-Limb Coronal Loop Dynamics as Seen from CDS, EIT and TRACE 
    Banerjee, D; O'Shea, E; Doyle, J. G (European Space Agency, 2006-07)
  • Omnipresent long-period intensity oscillations in open coronal structures 
    Krishna Prasad, S; Banerjee, D; Van Doorsselaere, T; Singh, J (EDP Sciences, 2012-10)
    Context. Quasi-periodic propagating disturbances in coronal structures have been interpreted as slow magneto-acoustic waves and/or periodic upflows. It is important to understand the nature of these disturbances before ...
  • On the statistical detection of propagating waves in polar coronal holes 
    Gupta, G. R; O'Shea, E; Banerjee, D; Popescu, M; Doyle, J. G (EDP Sciences, 2009-01)
    Context. Waves are important to the study of dynamical processes in coronal holes and the acceleration of the fast solar wind. A spectral time series was taken with the SUMER spectrometer on-board SoHO on 20 October 1996. ...
  • On the widths and ratios of MgX 609.79 and 624.94 Å lines in polar off-limb regions 
    O`Shea, E; Banerjee, D; Doyle, J. G (EDP Science, 2005-06)
    Using measurements of MgX 609.78 and 624.94 Å lines from the Coronal Diagnostic Spectrometer (CDS) on board SOHO, we seek to examine the variation of line width and line ratio in regions far off-limb at the Northern pole ...
  • Onboard Automated CME Detection Algorithm for the Visible Emission Line Coronagraph on ADITYA-L1 
    Ritesh Patel; Amareswari, K; Pant, v; Banerjee, D; Sankarasubramanian, K; Amit Kumar (Springer, 2018-07)
    ADITYA-L1 is India’s first space mission to study the Sun from the Lagrange 1 position. The Visible Emission Line Coronagraph (VELC) is one of seven payloads on the ADITYA-L1 mission, which is scheduled to be launched ...
  • Oscillations in active region fan loops: observations from EIS/Hinode and AIA/SDO 
    Krishna Prasad, S; Banerjee, D; Singh, J (Springer, 2012-11)
    Active region fan loops in AR 11076 were studied, in search of oscillations, using high cadence spectroscopic observations from Extreme-ultraviolet Imaging Spectrometer (EIS) on board Hinode combined with imaging sequences ...
  • An overview of science results obtained from Kodaikanal digitized white-light data archive: 1921-2011 
    Mandal, Sudip; Banerjee, D (Cambridge University Press, 2018-02)
    In this proceeding, we present a summary of the recent scientific results that have been derived using the newly digitized whit-light (WL) data obtained from the Kodaikanal Solar Observatory.
  • Plasma condensation in coronal loops 
    O'Shea, E; Banerjee, D; Doyle, D. J (EDP Sciences, 2007-11)
    Aims.Using temporal series data from the Coronal Diagnostic Spectrometer (CDS) on SOHO, we seek to investigate plasma condensation through the use of spectroscopic analysis. Methods.Using a space-time (X-T) type plot we ...
  • Polar Network Index as a Magnetic Proxy for the Solar Cycle Studies 
    Priyal, M; Banerjee, D; Karak, B. B; Munoz-Jaramillo, A; Ravindra, B; Choudhuri, A. R; Singh, J (IOP Publishing, 2014-09-20)
    The Sun has a polar magnetic field which oscillates with the 11 yr sunspot cycle. This polar magnetic field is an important component of the dynamo process which operates in the solar convection zone and produces the sunspot ...
  • Present and Future Observing Trends in Atmospheric Magneto-seismology 
    Banerjee, D; Erdelyi, Robert; Oliver, Ramon; O'Shea, Eoghan (2007-11)
    With modern imaging and spectral instruments observing in the visible, EUV, X-ray and radio wavelengths, the detection of oscillations in the solar outer atmosphere has become a routine event. These oscillations are ...
  • Propagating disturbances along a coronal loop from simultaneous EUV imaging and spectroscopic observations 
    Datta, A; Prasad, S. K; Banerjee, D (IOP Publishing, 2015-07)
    Propagating disturbances (PDs) were studied along an active region loop using simultaneous imaging and spectroscopy. An image sequence recorded in the Fe IX/Fe X 171Å channel, from TRACE and spectral data in the Si XII ...
  • Propagating disturbances along fan-like coronal loops in an active region 
    Mandal, Sudip; Samanta, T; Banerjee, D; Krishna Prasad, S; Teriaca, L (IOP Publishing, 2015-11)
    Propagating disturbances are often observed in active region fan-like coronal loops. They were thought to be due to slow mode magnetohydrodynamic waves based on some of the observed properties. However, recent studies ...
  • Propagating disturbances in the solar corona and spicular connection 
    Samanta, T; Pant, V; Banerjee, D (IOP Publishing, 2015-12-10)
    Spicules are small, hairy-like structures seen at the solar limb, mainly at chromospheric and transition region lines. They generally live for 3–10 minutes. We study these spicules in a south polar region of the Sun with ...

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