Coronal Loops, Anyone?

SDO captured a splendid example of expanding coronal loops seen in profile at the edge of the Sun (Oct. 14-15, 2014). The bright loops began to form and grow after a long-lasting M-class flare erupted. The arcs of the loops we see in extreme ultraviolet light are actually particles spiraling along magnetic field lines arcing above the active region that was the source of the flare. They are reorganizing the magnetic field after its disruption. To give a sense of scale, these huge loops are reaching out more than 15 times the size of Earth.

Credit: Solar Dynamics Observatory/NASA.