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Browsing by Author "Raju, K. P"

Browsing by Author "Raju, K. P"

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  • 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. ...
  • Search for Hydrogen-alpha Emitting Cool Pockets in Corona During the Total Solar Eclipse of October 24, 1995 
    Cowsik, R; Singh, J; Raju, K. P; Saxena, A. K; Samson, J. P. A; Naidu, B. N (Indian Institute of Astrophysics, Bangalore, 1997)
    Narrow pass band hydrogen alpha filtergrams were obtained during totality at Kalpi, to look for cool pockets of H-alpha emission in corona first observed by Bappu and Bhattacharyya during the 1970 Mexican eclipse observations. ...
  • Solar cycle variations of the EUV network characteristics from SDO/AIA 
    Varghese, Bilin Susan; Raju, K. P; Kurian, P. J; Paul, Issac (Springer Nature, 2022-01)
    It is well-known that there is a close relationship between the supergranules, magnetic field and the Extreme-UltraViolet (EUV) network of the solar atmosphere. We have obtained the network characteristics from the imaging ...
  • Spectroscopic Observation of Coronal Waves 
    Sakurai, T; Ichimoto, K; Raju, K. P; Singh, J (Springer, 2002-10)
    A time sequence over 80 min of coronal green-line spectra was obtained with a corona- graph at the Norikura Solar Observatory. Doppler velocities, line intensities, and line widths were derived through fitting a single ...
  • A Spectroscopic Study of the Solar Corona from Norikura and SOHO data 
    Raju, K. P; Sakurai, T; Ichimoto, K (International Astronomical Union, 2001)
    We report the results from a spectroscopic study of the solar corona, wherein, we examine some of the current problems in the corona, such as the plume-interplume differences in coronal holes, coronal loops in active regions ...
  • Studies of synoptic solar activity using Kodaikanal Ca K data 
    Raju, K. P (International Astronomical Union, 2017-09)
    The chromospheric network, the bright emission network seen in the chromospheric lines such as Ca ii K and Hα , outline the supergranulation cells. The Ca images are dominated by the chromospheric network and plages which ...
  • Temporal and Latitudinal Variations of the Length-Scales and Relative Intensities of the Chromospheric Network 
    Raju, K. P (Oxford University Press on behalf of the Royal Astronomical Society, 2018-08)
    The Calcium K spectroheliograms of the Sun from Kodaikanal have a data span of about 100 yr and covers over nine solar cycles. The Ca line is a strong chromospheric line dominated by chromospheric network and plages which ...
  • Temporal variations of the solar EUV network properties 
    Varghese, B.S; Raju, K. P; Kurian, P. J (Indian Academy of Sciences, 2019-07-11)
    The chromospheric network extended to the transition region as the solar EUV network disperses at the coronal level. The EUV emission lines from the transition region give information about different atmospheric heights. ...
  • Ultra-low Spatial Resolution Photometry in Near-infrared to Detect the Solar Dust Ring 
    Singh, J; Cowsik, R; Raju, K. P; Mohin, S; Ravi, K (Indian Institute of Astrophysics, Bangalore, 1997)
    There are conflicting reports about the existence of the dust ring around the Sun. An experiment to detect the solar dust ring was performed by IIA group during the total solar eclipse of Oct. 24, 1995. A near-infrared ...
  • Variation in the width of transition region network boundaries 
    Raju, K. P (Springer, 2016-12)
    The transition region network seen in solar extreme ultraviolet (EUV) lines is the extension of the chromospheric network. The network appears as an irregular web-like pattern over the solar surface outside active regions. ...
  • 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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