Journal
ASTROPHYSICAL JOURNAL
Volume 725, Issue 1, Pages 658-669Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/725/1/658
Keywords
Sun: dynamo; Sun: helioseismology; Sun: rotation
Categories
Funding
- NASA [NNX09AB12G, NNX08AQ34G]
- NSF [AGS-0958779]
- ONR
- HMI [16165880]
- High Altitude Observatory
- Directorate For Geosciences [0958779] Funding Source: National Science Foundation
- Div Atmospheric & Geospace Sciences [0958779] Funding Source: National Science Foundation
- NASA [121011, NNX09AB12G] Funding Source: Federal RePORTER
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Doppler shifts of the Fe I spectral line at 5250 angstrom from the full solar disk obtained over the period 1986 to 2009 are analyzed to determine the circulation velocity of the solar surface along meridional planes. Simultaneous measurements of the Zeeman splitting of this line are used to obtain measurements of the solarmagnetic field that are used to select low field points and impose corrections for the magnetically induced Doppler shift. The data utilized is from a new reduction that preserves the full spatial resolution of the original observations so that the circulation flow can be followed to latitudes of 80 degrees N/S. The deduced meridional flow is shown to differ from the circulation velocities derived from magnetic pattern movements. A reversed circulation pattern is seen in polar regions for three successive solar minima. A surge in circulation velocity at low latitudes is seen during the rising phases of cycles 22 and 23.
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