NASAのインスタグラム(nasa) - 7月26日 06時52分

Numerous arches of magnetic field lines danced and swayed above a large active region on the Sun over about a 30-hour period on July 17-18, 2017. We can also see the magnetic field lines from the large active region reached out and connected with a smaller active region. Those linked lines then strengthened (become brighter), but soon began to develop a kink in them and rather swiftly faded from view. All of this activity is driven by strong magnetic forces associated with the active regions. The images were taken in extreme ultraviolet light.
Credit: NASA

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