Tiny sigmoid in the quiet Sun
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Sigmoids are S- or reverse S-shaped pairs of hot loops usually seen in
the solar corona around active regions (see for example this XRT pictures).
Normally they are quite large, 100 or more arcseconds long. This
picture shows a tiny sigmoid, only 20 arcseconds long, located
in the quiet Sun very far from active regions.
Sigmoid structures in active regions usually lead to production of
flares or eruptions. Therefore, it is not at all surprising that this
little quiet-Sun sigmoid also produced a tiny flare just a few
minutes after this image was taken.
Keywords: Sigmoid, Quiet Sun |
(prepared by P. Grigis)
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