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Helioseismic Measurement of Solar Torsional Oscillations

Thompson, M. J.; Christensen-Dalsgaard, J.; Schou, J. +2 more

Bands of slower and faster rotation, the so-called torsional oscillations, are observed at the Sun's surface to migrate in latitude over the 11-year solar cycle. Here, we report on the temporal variations of the Sun's internal rotation from solar p-mode frequencies obtained over nearly 6 years by the Michelson Doppler Imager (MDI) instrument on bo…