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A Tiny Sigmoid Erupted in Obscurity ...
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The Sun is quiet these months. The most recent C-class flare we had was about two months ago (C2.0 on 2019 May 15). But this does not mean the Sun is dead quiet: Polar jets are still launching vigorously. Filaments sometimes show wriggle and lift-off. Even small scale flares are occurring.
On July 14, we observed a tiny sigmoid eruption from the active region, AR12744.
Although this event did not contribute to a notable enhancement
of the GOES/XRS flux, the sigmoid erupted at around 00:30 UT. The eruption was triggered by a
jet from a nearby bright point that happened around 22:38 UT on the previous day (7/13).
Cusp-shaped post flare loops developed for several
hours after the eruption. This is the same sequence of events
we often observe in the flares from larger sigmoids.
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(Prepared by Aki Takeda & Suman Panda)
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