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Browsing Publications of Astronomical Society of India by Author "Kariyappa, R"

Browsing Publications of Astronomical Society of India by Author "Kariyappa, R"

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  • Change of level population density with time in the solar quiet chromospheric atmosphere 
    Barman, S. K; Kariyappa, R (Astronomical Society of India, 2001)
    Employing a law of weak acoustic wave, the ratio of population density N2/N1 with time for the Ca II H and K lines appropriate for the solar quiet chromosphere have been calculated. This has been done by solving the equations ...
  • A double-pass spectrograph for solar research 
    Kariyappa, R; Jayarajan, A. P; Raheem, K. C. A; Sivaraman, K. R (Astronomical Society of India, 1993-06)
    We have described the double-pass spectrograph built at the Indian Institute of Astrophysics. Measurements of the scattered light within the spectrograph using the photoelectric scans of the NaI D-lines show that this is ...
  • Period-brightness relationship in chromospheric bright points 
    Kariyappa, R; Satya Narayanan, A; Dame, L (Astronomical Society of India, 2005-03)
    Chromospheric bright points are sites where intense heating takes place by 3-min period waves. A 35-min-long time series of photographic spectra obtained in CaII H-line on a quiet region at the center of the solar disk ...
  • 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 ...
  • Study of inhomogeneities in the solar atmosphere 
    Kariyappa, R (Astronomical Society of India, 1993)
  • 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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