Physics
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsp41a..08k&link_type=abstract
American Geophysical Union, Spring Meeting 2008, abstract #SP41A-08
Physics
7522 Helioseismology, 7524 Magnetic Fields
Scientific paper
From surface observations, it is well known that sunspots rotate faster than the surrounding plasma. Helioseismic observations have confirmed this behavior for near-surface layers. Here, we study the zonal flow of active regions in solar subsurface layers over a range of depths from the surface to about 16 Mm. We have analyzed about six years of GONG+ high-resolution Doppler data with the dense-pack ring-diagram analysis. We calculate the average zonal flow for a quiet- and an active-region subset defined as dense-pack patches (of 15 degree diameter) with an unsigned magnetic flux less than 3.4 G and greater than 65.0 G respectively. The average zonal flow of active regions is about 4m/s larger than the average flow of quiet regions on dense-pack length scales. This difference increases slightly with increasing depth and shows no apparent pattern in time and latitude. As a byproduct, we study the north-south asymmetry of the rotation rate in these subsurface layers and find that the asymmetry decreases during the declining phase of solar cycle 23.
González Hernández Irene
Hill F. F.
Howe Rachel
Komm Rudi
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