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Time Variability of Rotation in Solar Convection Zone From soi-mdi |
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| Authors: | Toomre J. Christensen-Dalsgaard J. Howe R. Larsen R.M. Schou J. Thompson M.J. |
| Affiliation: | (1) JILA, and Dept. of Astrophysical and Planetary Sciences, University of Colorado, Boulder, CO , 80309-0440, U.S.A.;(2) Teoretisk Astrofysik Center, Danmarks Grundforskningfond, Denmark;(3) National Solar Observatory, 950 N. Cherry Avenue, Tucson, AZ , 85726-6732, , U.S.A.;(4) Stanford University, HEPL Annex A201, Stanford, CA , 94305-4085, , U.S.A.;(5) Astronomy Unit, Queen Mary & Westfield College, London , E1 4NS, U.K. |
| Abstract: | The variation of rotation in the convection zone over a period of two years from mid-1996 is studied using inversions of SOI–MDI data. We confirm the existence of near-surface banded zonal flows migrating towards the equator from higher latitudes, and reveal that these banded flows extend substantially beneath the surface, possibly to depths as great as 70 Mm (10% of the solar radius). Our results also reveal apparently significant temporal variations in the rotation rate at high latitudes and in the vicinity of the tachocline over the period of study. |
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