Torsional oscillations of low mode |
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| Authors: | Herschel B Snodgrass Robert Howard |
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| Institution: | (1) Mount Wilson and Las Campanas Observatories, Carnegie Institution of Washington, 813 Santa Barbara Street, 91101 Pasadena, CA, U.S.A.;(2) Present address: National Solar Observatory, National Optical Solar Observatories, P.O. Box 26732, 85726-6732 Tucson, AZ, U.S.A. |
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| Abstract: | Standing wave torsional oscillations of wavenumber 1/2 and 1 hemisphere–1 are studied using an improved fit to Mount Wilson magnetograph data. These oscillations are seen to be in phase with each other and with the magnetic activity cycle, and seem best represented as a flexing of the differential rotation curve. Superposing them gives a differential rotation which at solar minimum is slightly flattened at the equator but considerably ( 5%) steepened at the poles, and also tends to produce a travelling wave with wavenumber 1 hemisphere–1 that moves from pole to equator as the cycle progresses. |
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