NASAのインスタグラム(nasa) - 11月22日 02時40分

A developing filament near the edge of the Sun churned and twisted as the rotating Sun brought it into clearer view Nov. 16-17. Filaments are cooler and often unstable clouds of particles floating above the Sun’s surface, which are tethered by magnetic forces.
In extreme ultraviolet light, they appear darker than the Sun’s surface. The bright area to the right of the filament is an active region. The loop that appears behind the filament in the middle of the clip is made of charged particles tracing magnetic field lines.
Credit: NASA
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