IIA Institutional Repository

Browsing by Author "Sivaraman, K. R"

Browsing by Author "Sivaraman, K. R"

Sort by: Order: Results:

  • Anchor depths of flux elements and depths of flux sources in relation to the two rotation profiles of the sun's surface magnetic fields 
    Sivaraman, K. R; Gokhale, M. H (Springer, 2004-06)
    It is known for over two decades now that the rotation of the photospheric magnetic fields determined by two different methods of correlation analysis leads to two vastly differing rotation laws - one the differential and ...
  • Are polar faculae generated by a local dynamo? 
    Sivaraman, K. R; Antia, H. M; Chitre, S. M (Springer, 2010)
    Polar faculae (PF) are bright, small-scale structures measuring a few seconds of arc, populating the polar zones at latitudes >50°. They possess magnetic fields ranging from 150 to 1,700 Gauss and largely constitute the ...
  • Atlas of H-Alpha Synoptic Charts for Solar Cycle 19 (1955 - 1964): Carrington Solar Rotations 1355 to 1486 
    Makarov, V. I; Sivaraman, K. R (Indian Institute of Astrophysics, Bangalore, 1986)
  • Atmospheric extinction measurements at Leh in near infrared bands 
    Bhattacharyya, J. C; Scaria, K. K; Singh, J; Babu, G. S. D; Muraleedharan Nair, R; Sivaraman, K. R (Astronomical Society of Indian, 1990-03)
    Site survey observations to determine the extinction in the IR bands were carried out at Leh. Mean extinction coefficients obtained from 'two nights' observations in J, H, and K bands are k(J) = 0.05 + or - 0.01; k(H) = ...
  • The bright points in the Ca II K-line and their relation to the inner network magnetic structures 
    Sivaraman, K. R (Springer-Verlag, 1991)
    We present observational evidence to show that the K/sub2v points bear a one to one correspondence with the inner network magnetic elements when the quiet sun is viewed under good spatial resolution. This would ...
  • Brightness, polarization and electron density of the solar corona of 1980 February 16 
    Sivaraman, K. R; Jayachandran, M; Scaria, K. K; Babu, G. S. D; Bagare, S. P; Jayarajan, A. P (Indian Academy of Sciences, 1984-06)
    During the eclipse of 1980 February 16 the authors photographed the solar corona at an effective wavelength of 6300 Å. Using a quadruple camera coronal pictures were obtained in polarized light for four polaroid orientations. ...
  • Broad Band Photometry of the Solar Corona of 1983, June 11 
    Sivaraman, K. R; Singh, J; Kapoor, R. C; Kariyappa, R (Indian Institute of Astrophysics, Bangalore, 1985-11)
    The solar corona was photographed at an effective wavelength of 6300A during the total eclipse of 1983, June 11 at Indonesia. From the isophotes of the corona, the intensity distributions along the equator, poles, streamers ...
  • CA II K bright points and the solar cycle 
    Sivaraman, K. R (Springer, 1984-09)
    We have made number counts of the bright points that populate the interior of the Ca II network in the solar chromosphere for four solar cycles. We find that the number of these fine structures during the solar maximum ...
  • Ca II K Emission from the Solar Chromosphere 
    Sivaraman, K. R (Indian Institute of Astrophysics, Bangalore, 1986)
    The role of the Ca II K line as a reliable diagnostic of the chromospheric activity on the Sun is reviewed. The chromospheric structures seen in this line serve as good indicators of the photospheric magnetic structures ...
  • CA II K Line Profile of the Truly Quiet Sun 
    Sivaraman, K. R; Gupta, S. S; Kariyappa, R (Kluwer Academic Publishers, 1996-01)
    While evaluating the chromospheric variability (solar cycle related or any other) using the Ca II K line (λ3933.684 Å) as an indicator, an essential prerequisite is the knowledge of the profile of a truly quiet Sun in the ...
  • CA II K2V spectral features and their relation to small-scale photospheric magnetic fields 
    Sivaraman, K. R; Livingston, W. C (D. Reidel Publishing Co.,, 1982-10)
    Although the Ca ii K232 network is known to be cospatial with magnetic elements there has been doubt as to the magnetic origin of the fainter K2V points. We demonstrate that weak magnetic elements also lie at the roots of ...
  • Calibration on the Sun for stellar magnetic fields 
    Sivaraman, K. R; Bagare, S. P; Gupta, S. S; Kariyappa, R (Springer, 1987-07)
    The intimate association between the surface magnetic fields and the Ca II K-line emission known to exist on the Sun, holds a promise for using this property to detect the presence of global magnetic fields on Sun-like ...
  • Chromospheric CA II K-line variations in the sun as a star over a solar cycle 
    Sivaraman, K. R; Singh, J; Bagare, S. P; Gupta, S. S (American Astronomical Society, 1987-02)
    The disk-averaged Ca II K profiles obtained at the Kodaikanal solar tower telescope for the period 1969-1984 are used to study the chromospheric variations in the sun as a star. The 1A index shows increases of 18 and 28 ...
  • Chromospheric heights in active regions 
    Bappu, M. K. V; Sivaraman, K. R (D Reidel Publishing, 1968)
  • Comet Ikeya-Seki (1965) and the nature of the Interplanetary Medium During its Apparition 
    Bappu, M. K. V; Sivaraman, K. R (Kodaikanal Observatory, 1969-01)
    The effects of a solar wind on the different parts of a comet are discussed. In terms of the observations obtained of Comet Ikeya-Seki (1965f). The solar wind contribution to the formulation of the scattering agencies in ...
  • Comets 
    Sivaraman, K. R (Astronomical Society of India, 1973-12)
  • The Cosmic Ray Flare of March 7, 1942 
    Sivaraman, K. R; Punetha, L. M (Kodaikanal Observatory, 1966-11)
    The variation of the dynamic characteristics of the cosmic ray limb flare of March 7, 1942 based on the K/sub232/ spectroheliograms and H-alpha spectrohelioscope observations of Kodaikanal is presented. Although the flare ...
  • Do polar faculae on the sun predict a sunspot cycle? 
    Makarov, V. I; Makarova, V. V; Sivaraman, K. R (Springer, 1989-03)
    The paper reports the results of the analysis of the data on polar faculae for three solar cycles (1960–1986) at the Kislovodsk Station of the Pulkovo Observatory and on polar bright points in Ca ii K line for two solar ...
  • Does the Poleward Migration Rate of the Magnetic Fields Depend on the Strength of the Solar Cycle? 
    Makarov, V. I; Tlatov, A. G; Sivaraman, K. R (Springer, 2001)
    We present the pattern of the polar magnetic reversal for cycle 23 derived from Hα synoptic charts and have also included the reversals of the earlier cycles 18-22 for comparison. At the beginning of a new cycle (i.e., ...
  • A Doppler Comparator for Solar Spectra 
    Kubicela, Aleksandar; Sivaraman, K. R (Kodaikanal Observatory, 1969-08)

Search DSpace

Browse

My Account