Physics
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997natur.390..485m&link_type=abstract
Nature, vol. 390, p. 485
Physics
78
Sunspots, Solar Spectra, Magnetic Flux, Siphoning, Solar Magnetic Field, Solar Wind
Scientific paper
The Evershed effect, a wavelength shift and profile asymmetry in the spectral lines observed from the outer regions of sunspots (the penumbra), has been interpreted as a radial outflow of gas from the sunspot, but the dynamics of the flow have not been fully understood. Although the Evershed effect seems to stop abruptly at the outer edge of the penumbra, the outflow itself must continue, though tracing its path has proved difficult. Theoretical and observational studies have suggested that much of the continuing flow may follow magnetic field lines that go below the visible surface of the sun at or just beyond the edge of the penumbra, and recent observations have now confirmed this picture. Here we show, using theoretical calculations based on a more realistic model, that the flow acts like a siphon which is driven along a magnetic flux tube by the pressure drop between the endpoints of the tube.
Montesinos Benjamin
Thomas John H.
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