Mass Motions and Magnetic Fields in Penumbrae

Details Mass Motions and Magnetic Fields in Penumbrae Mass Motions and Magnetic Fields in Penumbrae

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aspc..184...86w&link_type=abstract

Third Advances in Solar Physics Euroconference: Magnetic Fields and Oscillations, ASP Conference Series vol.184, p. 86-102. Eds.

Physics

14

Sunspot Penumbrae, Fine-Structures, Evershed Effect, Magnetic Field Structure, Line Profiles From Photospheric Layers

Scientific paper

Results from sunspot penumbral spectra of photospheric lines are discussed under the particular aspect of the structuring of magnetic fields and of the Evershed effect. Since the pioneering papers in the mid-sixties, a variety of observations were made at increasing spatial resolution. These establish spatially altering steeper and flatter penumbral flux-tubes. The Evershed effect seems to be located in the flatter field structure which has weaker field strengths. No clear relation is found between the spatial structure of the continuum intensity and that of the magnetic field and of the Evershed effect. This even holds for speckle reconstructued spectra which achieve a spatial resolution of 0.2 arcsec. The relation to the line-core intensities is closer; possibly since these originate from similar layers as those where field and flow are measured.

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