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Browsing by Subject "Coronal holes"

Browsing by Subject "Coronal holes"

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  • Coronal holes and long-lived unipolar magnetic regions 
    Shelke, R. N; Pande, M. C (Astronomical Society of India, 1984-12)
    Association of coronal holes with long-lived unipolar magnetic regions (LLUMRs) which survived for four solar rotations is examined. It is noticed that every coronal hole fits in well within the LLUMR. The coronal holes ...
  • Diagnostics of a coronal hole and the adjacent quiet sun by the hinode/EUV Imaging Spectrometer (EIS) 
    Kayshap, P; Banerjee, D; Srivastava, A. K (Springer, 2015-10)
    A comparison between a coronal hole (CH) and the adjacent quiet Sun (QS) has been performed using the spectroscopic diagnostics of the Hinode/EUV Imaging Spectrometer (EIS). Based on spectral signatures, we identify the ...
  • Eclipse observations of coronal emission lines. I.[FeX]6374 A profiles at the eclipse of 16 February 1980 
    Singh, J; Bappu, M. K. V; Saxena, A. K (Indian Academy of Sciences, 1982-09)
    Coronal spectra during the total solar eclipse of February 16, 1980, obtained in the 6374 A (forbidden Fe X) line using a multislit spectrograph are discussed. The dispersion of these spectra is 2.5 A/mm. The observed line ...
  • Line emission from the quiet sun and the coronal hole regions 
    Dwivedi, B. N; Raju, P. K (Astronomical Society of India, 1985-12)
    Using Kopp & Orrall (1976) model for the electron density and temperature for the quiet sun and the coronal hole regions, we have computed emission line intensities from Mg VIII, Si X (boron-like); Mg VII, Si IX (Carbon-like) ...
  • 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 ...
  • 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 ...
  • Propagation of type II burst shock waves along the radial magnetic field in the solar corona 
    Shelke, R. N; Pande, M. C (Astronomical Society of India, 1985-03)
    We present an analysis which indicates that in several cases coronal holes exist in the vicinity of the active regions producing type II bursts. It is inferred that shock waves which produce type II bursts essentially ...
  • Recurring coronal holes and their rotation rates during the solar cycles 22-24 
    Prabhu, K; Ravindra, B; Hegde, M; Doddamani, V. H (Springer, 2018-05)
    Coronal holes (CHs) play a significant role in making the Earth geo-magnetically active during the declining and minimum phases of the solar cycle. In this study, we analysed the evolutionary characteristics of the Recurring ...
  • Relative velocities and linewidths in a coronal hole and outside 
    Raju, K. P (Springer Netherlands, 2009-03)
    Relative Doppler velocities and spectral linewidths in a coronal hole and in the quiet Sun region outside have been obtained from Solar and Heliospheric Observatory (SOHO)/Coronal Diagnostic Spectrometer (CDS) observations. ...
  • Searching for a Solar Source of Magnetic-Field Switchbacks in Parker Solar Probe’s First Encounter 
    Pablos, D. de; Samanta, T; Badman, S. T; Schwanitz, C; Harra, L. K; Petrie, G; Mac Cormack, C; Mandrini, C. H; Raouafi, N. E; Martinez Pillet, V; Velli, M (Springer Nature, 2022-07)
    Parker Solar Probe observations show ubiquitous magnetic-field reversals closer to the Sun, often referred to as “switchbacks”. The switchbacks have been observed before in the solar wind near 1 AU and beyond, but their ...
  • Study of the solar wind streams associated with intense geomagnetic storms 
    Dubey, S. C; Mishra, A. P (Astronomical Society of India, 2001)
    A set of 50 intense geomagnetic storms follows the criteria of Dst≤-100 nT, IMF B ≥10 nT with time duration ≥ 3 hr., during the solar maximum period (1989-91) of solar cycle 22 have been analysed. The study of this short ...
  • Velocities and linewidths in the network and cell interiors of a polar coronal hole compared with the quiet Sun 
    Raju, K. P; Bromage, B. J. I (Springer, 2014-03)
    The relative Doppler velocities and linewidths in a polar coronal hole and the nearby quiet-Sun region have been obtained from the Solar and Heliospheric Observatory (SOHO)/Coronal Diagnostic Spectrometer (CDS) observations ...

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