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Browsing by Author "Krishna Prasad, S"

Browsing by Author "Krishna Prasad, S"

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  • Magnetohydrodynamic waves in open coronal structures 
    Banerjee, D; Krishna Prasad, S; Pant, V; McLaughlin, J. A; Antolin, P; Magyar, N; Ofman, L; Tian, H; Van Doorsselaere, T; De Moorte, I; Wang, T. J (Springer Nature B.V, 2021-10)
    Modern observatories have revealed the ubiquitous presence of magnetohydrodynamic waves in the solar corona. The propagating waves (in contrast to the standing waves) are usually originated in the lower solar atmosphere ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 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 ...
  • 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 ...
  • Spectroscopic studies of coronal structures using ground and space based data 
    Krishna Prasad, S (Indian Institute of Astrophysics, 2013-09)
  • A Statistical Study on the Frequency-dependent Damping of the Slow-mode Waves in Polar Plumes and Interplumes 
    Mandal, Sudip; Krishna Prasad, S; Banerjee, D (IOP Publishing, 2018-02)
    We perform a statistical study on the frequency-dependent damping of slow waves propagating along polar plumes and interplumes in the solar corona. Analysis of a large sample of extreme ultraviolet imaging data with ...
  • Thermal structure of coronal loops as seen with Norikura coronagraph 
    Krishna Prasad, S; Singh, J; Ichimoto, K (IOP Publishing, 2013-03-10)
    The thermal structure of a coronal loop, both along and across the loop, is vital in determining the exact plasma heating mechanism. High-resolution spectroscopic observations of the off-limb corona were made using the ...
  • Variation of Emission LineWidth in Mid and High-Latitude Corona 
    Krishna Prasad, S; Singh, J; Banerjee, D (Springer, 2013-02)
    Spectroscopic studies of the solar corona, using the high spatial and spectral resolution 25-cm corona graph at the Norikura Solar Observatory for equatorial off-limb observations, indicated that the variation of radiance ...

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