Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2009-04-09
Astrophys.J.698:1749-1760,2009
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
34 pages, 12 figures, submitted to the Astrophysical Journal
Scientific paper
10.1088/0004-637X/698/2/1749
Using high-resolution ring analysis (HRRA) we deduce subsurface flows within magnetic active regions and within quiet sun. With this procedure we are capable of measuring flows with a horizontal spatial resolution of 2 degrees in heliographic angle (or roughly 20 Mm). From the resulting flow fields we deduce mean inflow rates into active regions, mean circulation speeds around active regions, and probability density functions (PDFs) of properties of the flow field. These analyses indicate that active regions have a zonal velocity that exceeds that of quiet sun at the same latitude by 20 m/s, yet active regions advect poleward at the same rate as quiet sun. We also find that almost all active regions possess a mean inflow (20-30 m/s) and a cyclonic circulation (~5 m/s) at their peripheries, whereas their cores, where the sunspots are located, are zones of strong anticyclonic outflow (~50 m/s). From the PDFs, we find that active regions modify the structure of convection with a scale greater than that of supergranulation. Instead of possessing an asymmetry between inflows and outflows (with a larger percentage of the surface occupied by outflows), as is seen in quiet sun, active regions possess symmetric distributions.
Haber Deborah A.
Hindman Bradley W.
Toomre Juri
No associations
LandOfFree
Subsurface Circulations within Active Regions does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Subsurface Circulations within Active Regions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Subsurface Circulations within Active Regions will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-408981