AAS Meeting #194 - Chicago, Illinois, May/June 1999
Session 56. New Views of the Solar Interior
Solar, Display, Tuesday, June 1, 1999, 10:00am-7:00pm, Southeast Exhibit Hall

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[56.12] Zonal Flows from the MDI Medium-l Data

J. Schou (Stanford)

The small scale zonal flows in the outer part of the solar convection zone were recently detected by Kosovichev & Schou (1997) using f-mode frequency splittings. Results from five 72 day time-series (Schou et al. 1998) showed a slight drift of the pattern towards the equator in a manner similar to that seen in the so-called torsional oscillation observed using surface Doppler shift measurements. Here I describe results using several 72 day time-series of MDI Medium-l data. These results show a clear drift of the pattern towards the equator and that the near surface polar rotation rate appears to change with time.

This research is supported by the SOI-MDI NASA grant NAG5-3077 at Stanford University.

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