Latitude and depth variation of solar rotation

Astronomy and Astrophysics – Astronomy

Scientific paper

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102

Astrometry, Solar Rotation, Acoustic Frequencies, Acoustic Measurement, Convection Currents, Depth, Latitude, Periodic Variations, Solar Magnetic Field, Stellar Envelopes, Stellar Structure

Scientific paper

Measurements of the frequencies of various modes of trapped acoustic waves provide information about rotation and structure within the Sun. The authors present new results for modes with spherical harmonic degrees up to 98 which allow the convective envelope to be isolated. For degrees between 20 and 98 there is no evidence that internal rotation differs significantly with depth or latitude from the rotation of surface magnetic field patterns. Modes covering a wide latitude range have systematically lower frequencies than those confined near the equator, indicating the existence of a structural asymmetry within the Sun.

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