Differences in heliographic positions and rotation velocities of sunspot groups from various observatories (CROSBI ID 575270)
Prilog sa skupa u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Poljančić, Ivana ; Brajša, Roman ; Hržina, Damir ; Wöhl, Hubertus ; Hanslmeier, Arnold ; Pötzi, Werner ; Baranyi, Tunde ; Özgüç, Atila ; Singh, Jagdev ; Ruždjak, Vladimir
engleski
Differences in heliographic positions and rotation velocities of sunspot groups from various observatories
Measured positions of sunspot groups that differ in format, precision and observing procedure are collected from various data sets: GPR (Greenwich Photoheliographic Results), SOON/USAF/NOAA (Solar Optical Observing Network/United States Air Force/National Oceanic and Atmospheric Administration), as well as from the Kodaikanal and Debrecen observatories. Kanzelhöhe and Kandilli Observatory currently provide the digitized sunspot drawings, from which the positions of selected sunspot groups are determined with a special software Sungrabber. The rotation velocities are calculated from the position data. The aim of this work is to compare and to check the precision of the mentioned data sets using the Kanzelhöhe Observatory data set as the reference basis of sunspot position measurements. The selected groups (about 40% consist of single sunspots Zürich types H and J) are from the years 1972 and 1993 belonging to similar declining phases of two solar activity cycles. The occurrence of some systematic differences of the sunspot group positions and rotation velocities suggests the need for a more detailed analysis of the data accumulation procedures.
heliographic coordinates; heliographic longitude; heliographic latitude; angular velocity; data set
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Podaci o prilogu
59-70.
2011.
nije evidentirano
objavljeno
Podaci o matičnoj publikaciji
Central European astrophysical bulletin
Ruždjak, Vladimir ; Hanslmeier, Arnold ; Ruždjak, Domagoj
Zagreb: Geodetski fakultet Sveučilišta u Zagrebu
1845-8319
Podaci o skupu
Nepoznat skup
predavanje
29.02.1904-29.02.2096