Zobrazeno 1 - 10
of 66
pro vyhledávání: '"K. R. Sivaraman"'
Publikováno v:
Solar Physics. 266:247-259
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 the solar hemisphere)
Publikováno v:
Proceedings of the International Astronomical Union. 6:434-437
We have derived the latitude motions of sunspots classified into three area categories using the measures of positions and areas of their umbrae from the white – light images of the Sun for the period 1906 – 1987 from the Kodaikanal Observatory a
Publikováno v:
The Astrophysical Journal. 657:592-599
We reexamine the evolution of the observed tiltsof spot groups with life spans 2-7 days in the two latitude belts 13 � . Using an iterative procedure, we refine the linear fit betweenand the daily tilt angle changes �� and obtain reliable estim
Autor:
K. R. Sivaraman, M. H. Gokhale
Publikováno v:
Solar Physics. 221:209-223
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 the other rigid rotation. Sn
Publikováno v:
Solar Physics. 214:41-54
We have defined the duration of polar magnetic activity as the time interval between two successive polar reversals. The epochs of the polarity reversals of the magnetic field at the poles of the Sun have been determined (1) by the time of the final
Publikováno v:
Solar Physics. 214:65-87
We find from an analysis of the Kodaikanal sunspot group data that the rotation rates of spot groups increase with their age when the rotation rates are computed after sorting the spot groups life-span-wise. We confirm these findings from an analysis
Publikováno v:
Solar Physics. 202:11-26
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., soon after the polar reversa
Publikováno v:
Solar Physics. 196:333-348
We examine here the variations of tilt angle and polarity separation (as defined in this paper) of multi-spot sunspot groups from the Kodaikanal and Mount Wilson data sets covering many decades. We confirm the tilt-angle change vs tilt-angle result f
Autor:
K. R. Sivaraman
Publikováno v:
International Astronomical Union Colloquium. 179:149-153
The synoptic observations of Kodaikanal form one of the longest unbroken solar data from the beginning of the 20th century to the present day, and consists of the white light and monochromatic images of the sun. In this review, I shall discuss the re
Publikováno v:
Solar Physics. 189:69-83
The Kodaikanal sunspot data set, covering the interval 1906–1987, is used in conjunction with the similar Mount Wilson sunspot data set, covering the interval 1917–1985, to examine characteristics of sunspot group axial tilt angles. Good agreemen