(Click image to view movie.)
New Year's Transient Sigmoid (movie)
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Over the New Year holiday, XRT observed the Sun with its widest field
of view, and monitored the development of the small active region
shown here. During the interval, the region produced a few small
eruptions, casting material into the heliosphere. On New Year's Day,
coronal loops in the core of the active region brightened up, and for
a short time had the "S" shape that we call a coronal sigmoid.
This is an example of a transient sigmoid, as opposed to the
long-lasting sigmoids which can hold their appearance for several
days. Look closer, and you'll even see that this sigmoid's S looks
like two J's facing each other.
[filter is thin-Be; exposure is 23 s]
Keywords: Sigmoid Filters: Be_thin |
(Prepared by D. McKenzie)
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