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Meridional Motion and Reynolds Stress from Debrecen Photoheliographic Data
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SYSNO ASEP 0480935 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Meridional Motion and Reynolds Stress from Debrecen Photoheliographic Data Author(s) Sudar, D. (HR)
Brajša, R. (HR)
Skokić, Ivica (ASU-R)
Beljan, I.P. (HR)
Woehl, H. (DE)Source Title Solar Physics. - : Springer - ISSN 0038-0938
Roč. 292, č. 7 (2017), 86/1-86/13Number of pages 13 s. Publication form Print - P Language eng - English Country NL - Netherlands Keywords sunspots ; rotation ; velocity fields Subject RIV BN - Astronomy, Celestial Mechanics, Astrophysics OECD category Astronomy (including astrophysics,space science) R&D Projects 7E13003 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support ASU-R - RVO:67985815 UT WOS 000406304300004 EID SCOPUS 85021091545 DOI 10.1007/s11207-017-1105-4 Annotation he Debrecen Photoheliographic Data catalogue is a continuation of the Greenwich Photoheliographic Results providing daily positions of sunspots and sunspot groups. We analyse the data for sunspot groups focussing on meridional motions and transfer of angular momentum towards the solar equator. Velocities are calculated with a daily shift method including an automatic iterative process of removing the outliers. Apart from the standard differential rotation profile, we find meridional motion directed towards the zone of solar activity. The difference in measured meridional flow in comparison to Doppler measurements and some other tracer measurements is interpreted as a consequence of different flow patterns inside and outside of active regions. We also find a statistically significant dependence of meridional motion on rotation velocity residuals confirming the transfer of angular momentum towards the equator. Analysis of horizontal Reynolds stress reveals that the transfer of angular momentum is stronger with increasing latitude up to about 40 degrees, where there is a possible maximum in absolute value. Workplace Astronomical Institute Contact Radka Svašková, bibl@asu.cas.cz, Tel.: 323 620 326 Year of Publishing 2018
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