EUV Sunspot Plumes Observed with SOHO

Details EUV Sunspot Plumes Observed with SOHO EUV Sunspot Plumes Observed with SOHO

1998-01-15

arxiv.org/abs/astro-ph/9801144v1

Astrophys.J. 496 (1998) L117-L119

Astronomy and Astrophysics

Astrophysics

8 pages, 3 figures, to be published in ApJ Letters

Scientific paper

10.1086/311261

Bright EUV sunspot plumes have been observed in five out of nine sunspot regions with the Coronal Diagnostic Spectrometer -- CDS on SOHO. In the other four regions the brightest line emissions may appear inside the sunspot but are mainly concentrated in small regions outside the sunspot areas. These results are in contrast to those obtained during the Solar Maximum Mission, but are compatible with the Skylab mission results. The present observations show that sunspot plumes are formed in the upper part of the transition region, occur both in magnetic unipolar-- and bipolar regions, and may extend from the umbra into the penumbra.

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