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Paper: Dynamics of Sunspots
Volume: 118, First Advances in Solar Physics Euroconference: Advances in the Physics of Sunspots
Page: 91
Authors: Maltby, P.
Abstract: Since we are observing the Sun from one vantage point, either in space or from the ground, a complete determination of the velocity field is difficult and critically dependent on the assumptions applied. After a brief review of the characteristics of gas flow in flux tubes the siphon flow hypothesis is presented and confronted with observations. It is found that the inverse Evershed effect in the chromosphere is compatible with a siphon flow, provided new flow channels constantly replace old ones as they lose their mass to the sunspot. The conflicts between the siphon flow hypothesis and the observations of the Evershed effect are discussed and possible solutions presented. New SOHO observations of the sunspot region in the transition region and the corona are presented and the observational basis for the multiple flow concept is discussed. The complexity of the observed flow field in the transition region is underlined and alternative working hypotheses are discussed.
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