Sigmoid Eruption
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These four images show the evolution of a sigmoid in an old remnant.
At the begining, we see two sets of discontinuous loops, which is
shown in the top left panel. A very thin S-shape loop starts to
appear between the two sets of loops at around 12:11 UT on Feb 11,
which can be seen in the top panel on the right. At around 18:00
UT on Feb 11, a dark S shows up in this region (see the bottom left
panel). Does this dark S indicate where the filament is? Or why can
we see this dark S structure? This sigmoid starts to erupt around 06:21
UT on Feb 12. A series of expanding enlongated loops appear after the
eruption, as can be seen in the bottom right panel. Is this evolution of the
sigmoid consistent with the current theory?
Keywords: Sigmoid, Filament |
(Prepared by Yingna Su)
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