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Meridional Motion and Reynolds Stress from Debrecen Photoheliographic Data
- 1.0480935 - ASÚ 2018 RIV NL eng J - Journal Article
Sudar, D. - Brajša, R. - Skokić, Ivica - Beljan, I.P. - Woehl, H.
Meridional Motion and Reynolds Stress from Debrecen Photoheliographic Data.
Solar Physics. Roč. 292, č. 7 (2017), 86/1-86/13. ISSN 0038-0938. E-ISSN 1573-093X
R&D Projects: GA MŠMT(CZ) 7E13003
EU Projects: European Commission(XE) 312495 - SOLARNET
Institutional support: RVO:67985815
Keywords : sunspots * rotation * velocity fields
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 2.580, year: 2017
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.
Permanent Link: http://hdl.handle.net/11104/0276595
Number of the records: 1