Migration of Zonal Flows Detected Using Michelson Doppler Imager F-Mode Frequency Splittings

Details Migration of Zonal Flows Detected Using Michelson Doppler Imager F-Mode Frequency Splittings Migration of Zonal Flows Detected Using Michelson Doppler Imager F-Mode Frequency Splittings

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...523l.181s&link_type=abstract

The Astrophysical Journal, Volume 523, Issue 2, pp. L181-L184.

Astronomy and Astrophysics

Astronomy

108

Sun: Activity, Sun: Interior, Sun: Oscillations, Sun: Rotation

Scientific paper

The small-scale zonal flows in the outer part of the solar convection zone were recently detected by Kosovichev & Schou using f-mode frequency splittings. Results from five 72 day time series (Schou et al.) show a slight drift of the pattern toward 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 12 72 day time series of the Michelson Doppler Imager medium-l data. These results show a clear drift of the pattern toward the equator. Also, the near-surface rotation rate close to the solar poles is observed to be slower than expected from an extrapolation from lower latitudes and to be changing with time.

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