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Browsing by Author "Banerjee, D"

Browsing by Author "Banerjee, D"

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  • Propagating intensity disturbances in polar corona as seen from AIA/SDO 
    Krishna Prasad, S; Banerjee, D; Gupta, G. R (EDP Sciences, 2011-04)
    Context. Polar corona is often explored to find the energy source for the acceleration of the fast solar wind. Earlier observations show omni-presence of quasi-periodic disturbances, traveling outward, which is believed ...
  • Propagating MHD waves in coronal holes 
    Banerjee, D; Teriaca, L; Gupta, G. R (Springer, 2011-07)
    Coronal holes are the coolest and darkest regions of the upper solar atmosphere, as observed both on the solar disk and above the solar limb. Coronal holes are associated with rapidly expanding open magnetic fields and the ...
  • Propagating waves in polar coronal holes as seen by SUMER & EIS 
    Banerjee, D; Teriaca, L; Gupta, G. R; Imada, S; Stenborg, G; Solanki, S. K (EDP Sciences, 2009-06)
    Context: To study the dynamics of coronal holes and the role of waves in the acceleration of the solar wind, spectral observations were performed over polar coronal hole regions with the SUMER spectrometer on SoHO and the ...
  • Proposed visible emission line space solar coronagraph 
    Singh, J; Prasad, B. R; Venkatakrishnan, P; Sankarasubramanian, K; Banerjee, D; Bayanna, R; Mathew, S; Murthy, J; Subramaniam, P; Ramesh, R; Kathiravan, S; Nagabhushana, S; Mahesh, P. K; Manoharan, P. K; Uddin, W; Sriram, S; Amit Kumar; Srivastava, N; Koteswara Rao; Nagendra, C. L; Chakraborty, P; Sriram, K. V; Venkateswaran, R; Krishnamurthy, T; Sreekumar, P; Sarma, K. S; Murthy, R; Navalgund, K. H; Samudraiah, D. R. M; Narayan Babu, P; Patra, A (Indian Academy of Sciences, 2011-01-25)
    The outer atmosphere of the sun – called the corona – has been observed during total solar eclipse for short periods (typically < 6 min), from as early as the eighteenth century. In the recent past, space-based instruments ...
  • Quasi-periodic oscillation of a coronal bright point 
    Samanta, T; Banerjee, D; Tian, H (IOP Publishing, 2015-06-20)
    Coronal bright points (BPs) are small-scale luminous features seen in the solar corona. Quasi-periodic brightenings are frequently observed in the BPs and are generally linked with underlying magnetic flux changes. We study ...
  • 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 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 ...
  • A Simple Radial Gradient Filter for Batch-Processing of Coronagraph Images 
    Patel, Ritesh; Majumdar, Satabdwa; Pant, Vaibhav; Banerjee, D (Springer, 2022-03)
    Images of the extended solar corona, as observed by different white-light coronagraphs, include the K- and F-corona and suffer from a radial variation in intensity. These images require separation of the two coronal ...
  • Simultaneous longitudinal and transverse oscillations in an active-region filament 
    Pant, V; Mazumder, R; Yuan, Ding; Banerjee, D; Srivastava, A. K; Shen, Yuandeng (Springer, 2016-11)
    We report on the co-existence of longitudinal and transverse oscillations in an active-region filament. On March 15, 2013, an M1.1 class flare was observed in Active Region AR 11692. A coronal mass ejection (CME) was found ...
  • Simultaneous longitudinal and transverse oscillations in filament threads after a failed eruption 
    Mazumder, R; Pant, V; Manuel Luna; Banerjee, D (EDP Sciences, 2020-01)
    Context. Longitudinal and transverse oscillations are frequently observed in the solar prominences and/or filaments. These oscillations are excited by a large-scale shock wave, impulsive flares at one leg of the filament ...
  • Solar Active Longitudes from Kodaikanal White-Light Digitized Data 
    Mandal, Sudip; Chatterjee, Subhamoy; Banerjee, D (IOP Publishing, 2017-01-20)
    The study of solar active longitudes has generated great interest in recent years. In this work we have used a unique, continuous sunspot data series obtained from the Kodaikanal observatory and revisited the problem. An ...
  • Solar coronal magnetic fields derived using seismology techniques applied to omnipresent sunspot waves 
    Jess, D. B; Reznikova, V. E; Ryans, R. S. I; Christian, D. J; Keys, P. H; Mathioudakis, M; Mackay, D. H; Krishna Prasad, S; Banerjee, D; Grant, S. D. T; Yau, S; Diamond, C (Nature Publishing Group, 2016-02)
    Sunspots on the surface of the Sun are the observational signatures of intense manifestations of tightly packed magnetic field lines, with near-vertical field strengths exceeding 6,000 G in extreme cases. It is well accepted ...
  • 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 solar ultraviolet imaging telescope onboard Aditya-L1 
    Ghosh, Avyarthana; Chatterjee, Subhamoy; Khan, Aafaque R; Tripathi, Durgesh; Ramaprakash, A. N; Banerjee, D; Chordia, P; Gandorfer, Achim; Krivova, N.A; Nandy, D; Rajarshi, Chaitanya; Solanki, S. K; Sriram, S (SPIE-The International Society for Optical Engineering, 2016-07)
    The Solar Ultraviolet Imaging Telescope (SUIT) is an instrument onboard the Aditya-L1 spacecraft, the first dedicated solar mission of the Indian Space Research Organization (ISRO), which will be put in a halo orbit at the ...
  • Spectroscopic Observation of Oscillations in the Corona During the Total Solar Eclipse of 22 July 2009 
    Singh, J; Hasan, S. S; Gupta, G. R; Nagaraju, K; Banerjee, D (Springer, 2011-05)
    We performed high resolution spectroscopy of the solar corona during the total solar eclipse of 22 July 2009 in two emission lines: the green line at 5303 Å due to Fe xiv and the red line at 6374 Å due to Fe x, simultaneously ...
  • Spectroscopic observations of propagating disturbances in a polar coronal hole: evidence of slow magneto-acoustic waves 
    Gupta, G. R; Teriaca, L; Marsch, E; Solanki, S. K; Banerjee, D (EDP Sciences, 2012-10)
    Aims. We focus on detecting and studying quasi-periodic propagating features that have been interpreted in terms of both slow magneto-acoustic waves and of high-speed upflows. Methods. We analyzed long-duration spectroscopic ...
  • Statistical detection of propagating waves in a polar coronal hole 
    Gupta, G. R; O'Shea, E; Banerjee, D; Popescu, M; Doyle, J. G (Springer, 2010)
    Waves are important in the heating of the solar corona and the acceleration of the solar wind. We have examined a long spectral time series sampling a southern coronal hole, observed on the 25 February 1997 using the SUMER ...
  • Statistical study of network jets observed in the solar transition region: a comparison between coronal holes and quiet-sun regions 
    Narang, Nancy; Arbacher, R. T; Tian, H; Banerjee, D; Cranmer, S. R; DeLuca, Ed E; McKillop, S (Springer, 2014-04)
    Recent IRIS observations have revealed a prevalence of intermittent small-scale jets with apparent speeds of 80 – 250 km s−1, emanating from small-scale bright regions inside network boundaries of coronal holes. We find ...
  • A statistical study of plasmoids associated with a post-CME current sheet 
    Ritesh Patel; Pant, Vaibhav; Chandrashekhar, K; Banerjee, D (EDP Sciences, 2020-12)
    Context. Coronal mass ejections (CMEs) are often observed to be accompanied by flare, current sheets, and plasmoids/plasma blobs. 2D and 3D numerical simulations and observations reported plasmoids moving upward as well ...
  • A statistical study of wave propagation in coronal holes 
    O`Shea, E; Banerjee, D; Doyle, J. G (Astronomy and Astrophysics, Vol. 463, pp. 713 - 725, 2007-02)
    Aims.To find evidence for propagating magnetoacoustic waves in equatorial and polar coronal hole locations. Methods: Using temporal series data from the Coronal Diagnostic Spectrometer (CDS) on SOHO, we study oscillations ...

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