✦ LIBER ✦

The concentration of the large-scale solar magnetic field by a meridional surface flow

✍ Scribed by C. R. DeVore; N. R. Sheeley; J. P. Boris

Publisher: Springer
Year: 1984
Tongue: English
Weight: 649 KB
Volume: 92
Category: Article
ISSN: 0038-0938
DOI: 10.1007/bf00157230

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✦ Synopsis

We calculate analytical and numerical solutions to the magnetic flux transport equation in the absence of new bipolar sources of flux, for several meridional flow profiles and a range of peak flow speeds. We find that a polcward flow with a broad profile and a nominal 10 m s-1 maximum speed concentrates the large-scale field into very smaU caps of less than 15 ~ half-angle, with average field strengths of several tens of gauss, contrary to observations. A flow which reaches its peak speed at a relatively low latitude and then decreases rapidly to zero at higher latitudes leads to a large-scale field pattern which is consistent with observations. For such a flow, only lower latitude sunspot groups can contribute to interhemispheric flux annihilation and the resulting decay and reversal of the polar magnetic fields.

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