The effects of meridional motion on the determination of rotation by tracer tracking

Details The effects of meridional motion on the determination of rotation by tracer tracking The effects of meridional motion on the determination of rotation by tracer tracking

Jan 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000soph..191...21s&link_type=abstract

Solar Physics, v. 191, Issue 1, p. 21-35 (2000).

Physics

2

Scientific paper

We explore a systematic error that arises in feature-tracking measurements of time-average rotation. It stems from the flows of features across latitudes, and as these flows vary with the solar activity cycle, the error has a pattern of variation which mocks the torsional oscillation. We develop a series expansion for this error and evaluate the leading terms for the example case of cycle 21. It grows with the time lag; for a 30 day lag it is <~1%, depending on how the correlations are done and interpreted. We conclude that the mock pattern cannot, however, account for the magnetic-rotation torsional oscillations pattern found in recent analyses of magnetograms from Kitt Peak and Mount Wilson. For the 1-day time lag in the Kitt Peak study, the error is negligible, and for the ~30-day time lag in the Mount Wilson study, it represents at most about 30% of the signal.

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