Evidence for a Current Sheet above a Sunspot Umbra

Details Evidence for a Current Sheet above a Sunspot Umbra Evidence for a Current Sheet above a Sunspot Umbra

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apj...686l..45t&link_type=abstract

The Astrophysical Journal, Volume 686, Issue 1, pp. L45-L48.

Astronomy and Astrophysics

Astronomy

3

Magnetic Fields, Sun: Chromosphere, Sun: Sunspots

Scientific paper

We present observational evidence for the existence of a current sheet in the chromosphere above a sunspot umbra based on high angular resolution two-dimensional spectroscopic observations in the Ca II 854.21 nm line. In the core of this line we observe a very stable bright ribbon-like structure separating magnetic field configurations that connect to different parts of the active region. We make plausible that the structure is a string of sheets carrying vertical currents that result from dissipation when the different parts of the active region are moved around in the photosphere. To our knowledge this is the first direct observation of the heating caused by the dissipation in such a current sheet in the chromosphere.

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