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Browsing by Author "Gupta, S. S"

Browsing by Author "Gupta, S. S"

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  • Results from a revisit to the K2V bright points 
    Sivaraman, K. R; Gupta, S. S; Livingston, W. C; Damé, L; Kalkofen, W; Keller, C. U; Smartt, R; Hasan, S. S (European Southern Observatory, 2000-11)
    We have used pairs of temporally simultaneous CaII K-line spectroheliograms and magnetic area scans to search for spatial correlation between the CaII K2V bright points in the interior of the network and corresponding ...
  • Return Meridional Flow in the Convection Zone from Latitudinal Motions of Umbrae of Sunspot Groups 
    Sivaraman, K. R; Sivaraman, H; Gupta, S. S; Howard, R. F (Springer, 2010-10)
    We have derived the velocities of meridional flows by measuring the latitudinal motions (or drifts) of umbrae of spot groups classified into three categories of area: 0 – 5 μ, 5 – 10 μ, and >10 μ (μ area in millionths of ...
  • Role of field lines in the case of an eruptive prominence 
    Gupta, S. S; Singh, J (Astronomical Society of India, 1998)
    We have analysed the old data of calcium K line solar prominences obtained at Kodaikanal. The analysis indicated that the height of the quiescent prominence on the limb increases with its lifetime. In one case of prominence ...
  • Solar variability in the CaII K during solar cycles 21 and 22 
    Sivaraman, K. R; Gupta, S. S; Kariyappa, R; Aleem, P. S. M; Sundararaman, K (Astronomical Society of India, 1993)
    We have monitored the sun in the light of the CaII K line and obtained the disc integrated profiles for the years 1974-91. From these profiles we have estimated the variability of the sun as a star as seen in the various ...
  • Sunspot motions from a study of Kodaikanal and Mount Wilson observations 
    Howard, R. F; Sivaraman, K. R; Gupta, S. S; Gilman, P. I (International Astronomical Union, 1990)
    Results are presented of a study of the daily motions of individual sunspots and of sunspot groups on the basis of Kodaikanal and Mount Wilson white-light observations. A comparison of the two data sets show a good agreement ...
  • What is a quiet sun CaII K line profile? 
    Sivaraman, K. R; Gupta, S. S; Kariyappa, R (Astronomical Society of India, 1993)
    We have derived a mean disc averaged K line profile from observations at the Kodaikanal Solar Tower Telescope on days when sun was relatively very quiet during the years 1985-86. This mean profile would represent the K-line ...

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