Meridional motions and Reynolds stress from SDO/AIA coronal bright points data

0488864 - ASÚ 2018 RIV FR eng J - Journal Article
Sudar, D. - Saar, S.H. - Skokić, Ivica - Poljančić Beljan, I. - Brajša, R.
Meridional motions and Reynolds stress from SDO/AIA coronal bright points data.
Astronomy & Astrophysics. Roč. 587, March (2016), A29/1-A29/6. ISSN 0004-6361. E-ISSN 1432-0746
R&D Projects: GA MŠMT(CZ) 7E13003
Keywords : Sun * rotation * corona
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 5.014, year: 2016

We derived a very accurate solar rotation profile and investigated meridional flows, torsional oscillations, and horizontal Reynolds stress based on approximate to 6 months of SDO/AIA data. We used a segmentation algorithm to detect CBPs in SDO/AIA images. We also used invariance of the solar rotation profile with central meridian distance (CMD) to determine the height of CBPs in the 19.3 nm channel. Most of the results are consistent with Doppler measurements rather than tracer measurements. The fairly small calculated value of horizontal Reynolds stress might be due to the particular phase of the solar cycle. Accuracy of the calculated rotation profile indicates that it is possible to measure changes in the profile as the solar cycle evolves. Analysis of further SDO/AIA CBP data will also provide a better understanding of the temporal behaviour of the rotation velocity residuals, meridional motions, and Reynolds stress.
Permanent Link: http://hdl.handle.net/11104/0283385