Makarov, V. I; Stoianova, M. N; Sivaraman, K. R(Indian Academy of Sciences, 1982-12)
The results of a study of the morphology of the large-scale filament structures of the sun and their relations with the distribution of the large-scale magnetic field on the solar surface are reported. A continuous filament ...
Babu, G. S. D; Nathan, J. S; Rajamohan, R; Sivaraman, K. R(Astronomical Society of Indian, 1989-09)
IHW filter photometry of Comet Halley was carried out on seven nights during pre-perihelion period and on six nights during post-perihelion period, using the 40-cm telescope at the Vainu Bappu Observatory, Kavalur, as a ...
The poleward migration-trajectory diagram of filament bands is derived for the years 1915-1982 from the H-alpha synoptic charts. The global solar activity commences soon after the polar-field reversal in the form of two ...
Iijima, T; Gehrz, R. D; Jones, T. J; Lawrence, G; Sivaraman, K. R; Prabhu, T. P; Ghosh, K. K; Anupama, G. C; Selvakumar, G(Smithsonian Astrophysical Observatory, 1991-04)
Sivaraman, K. R(D. Reidel Publishing Co., 1973-12)
The 5-min oscillations in the photospheric velocity fields have been studied in detail from measurements on 14 absorption lines from three time sequences of spectrograms of high quality. The lines cover a range of heights ...
The coherence and phase spectra between velocity oscillations in different pairs of lines have been studied. The oscillation in the high level lines are found to lag behind those in the low level lines in general. There ...
Singh, J; Sivaraman, K. R; Rajamohan, R(Indian Institute of Astrophysics, Bangalore, 1988)
During the total solar eclipse of 1983 June 11, coronal spectra were obtained in the 5303A (Fe XIV) line using the multislit spectrograph at a dispersion of 2.17A mm-1 . The line profiles measured at 113 locations from ...
Bappu, M. K. V; Bhattacharyya, J. C; Sivaraman, K. R(D. Reidel Publishing, 1972-10)
Emission lines of the Balmer series, D3 and H and K are reported present on a coronal spectrogram obtained at the March 7, 1970 eclipse. Arguments are presented to show that these could not have originated from scattering ...
Makarov, V. I; Sivaraman, K. R(Astronomical Society of Indian, 1986-09)
The H-alpha synoptic charts for the 1904-1982 period and data on the polar prominences for the 1870-1905 period are used to investigate the polarity reversal of the polar magnetic field on the sun for 11 solar cycles. Good ...
Krishan, V; Sivaraman, K. R(D. Reidel Publishing Co., 1982-04)
Direct photographs of Comet Ikeya-Seki obtained on four consecutive days from October 29 to November 1, 1965, are used for an analysis of the multiple helical structures in the ionised tail. The formation of these structures ...
Gokhale, M. H; Sivaraman, K. R(Astronomical Society of India, 1982-06)
It is confirmed that near each solar minimum the latitude zone over which the small sunspot groups are distributed expands a few years before the expansion of the latitude zone of the large spot groups takes place. It is ...
Bappu, M. K. V; Bhattacharyya, J. C; Sivaraman, K. R(Indian Academy of Sciences, 1973)
Isophotes obtained by equidensitometry techniques from four exposures
of the March 7, 1970 corona are used for derivation of intensity distributions along the
equator, poles, streamers and dark ' gaps ' in the visible ...
Makarov, V. I; Fatianov, M. P; Sivaraman, K. R(Springer, 1983-06)
Poleward migration of the magnetic neutral line on the sun has been calculated for the periods 1945-1950 and 1955-1981 using synoptic charts based on H-alpha observations. Epochs of sign reversal of the solar magnetic field ...
Poleward migration of the magnetic neutral line on the sun has been computed for the period 1904-1940 using synoptic charts based on H-alpha observations and the epochs of sign reversal of the solar magnetic field at ...