Zobrazeno 1 - 10
of 65
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)
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6598624439da0368285c685298e0db68
https://doi.org/10.1007/s11207-010-9620-6
https://doi.org/10.1007/s11207-010-9620-6
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
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3b0aaba8642fc7ee93140f7fe2b29e81
https://doi.org/10.1017/s1743921311015717
https://doi.org/10.1017/s1743921311015717
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
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::46f4aed33ee0b961e65fe90b58846661
https://doi.org/10.1086/510546
https://doi.org/10.1086/510546
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
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0f0601822ecd986cefd4e8d8eb8d5a38
https://doi.org/10.1023/b:sola.0000035060.53998.29
https://doi.org/10.1023/b:sola.0000035060.53998.29
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
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::97b724740d94b01111acfe8219593265
https://doi.org/10.1023/a:1024003708284
https://doi.org/10.1023/a:1024003708284
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
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f1de191d1280586f6b5ac195714c46ba
https://doi.org/10.1023/a:1011855103278
https://doi.org/10.1023/a:1011855103278
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
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4a61b2e1de5882578794bd45cfcfa8f3
https://doi.org/10.1023/a:1005288227384
https://doi.org/10.1023/a:1005288227384
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
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d4ed86901455b4ba8074294e2ad3b8f8
https://doi.org/10.1017/s0252921100064381
https://doi.org/10.1017/s0252921100064381
Publikováno v:
Solar Physics. 186:25-41
Sunspot umbral positions and areas were measured for 82 years (1906–1987) of daily, full-disk photoheliogram observations at the Kodaikanal station of the Indian Institute of Astrophysics. The measurement technique and reduction procedures used wer
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8d65805d1cd244e1988a4c1d110d3cdf
https://doi.org/10.1023/a:1005153925209
https://doi.org/10.1023/a:1005153925209
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
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7cce767e078121b1fa720a631e66e88e
https://doi.org/10.1023/a:1005277515551
https://doi.org/10.1023/a:1005277515551