Solar Meridional Flow Detected in Small Magnetic Features

Details Solar Meridional Flow Detected in Small Magnetic Features Solar Meridional Flow Detected in Small Magnetic Features

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.8102k&link_type=abstract

American Astronomical Society, 181st AAS Meeting, #81.02; Bulletin of the American Astronomical Society, Vol. 24, p.1252

Astronomy and Astrophysics

Astronomy

Scientific paper

We present results of an analysis of 514 high-resolution magnetograms taken daily with the NSO Vacuum Telescope on Kitt Peak from 1978 to 1990. Motions in latitude on the solar surface are determined by a two-dimensional crosscorrelation analysis of consecutive day pairs after excluding large active regions. We find a meridional flow of the order of 10 ms(-1) , which is poleward in each hemisphere, increases in amplitude from 0 at the equator, reaches a maximum at mid-latitude, and slowly decreases poleward. The average meridional flow is fit by an expansion of derivatives of even Legendre polynomials $M(theta ) = 8.88 (+/- 0.45) {{partial P_2}/{partial theta }} - 0.66 (+/-0.26) {{partial P_4}/{partial theta }} in ms^{-1}\ where \theta is the latitude, which reaches a maximum of 13.2 ms^{-1}\ at 39 deg. We also find a solar cycle dependence of the meridional flow. The flow remains poleward during the cycle, but the amplitude (at latitudes poleward of 20 deg) changes from smaller-than-average during maximum to larger-than-average during minimum. The meridional flow fit of the maximum activity years 1980--1982 peaks at 10.9 ms^{-1}, while the fit of the minimum years 1984--1986 reaches a maximum velocity of 14.5 ms^{-1}$; the difference is about 27% of the average value.

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