Still a filament arrow?
Monday, June 22, 2015 - 06:00
in Astronomy & Space
On May 28, 2015 (above left), the sun, as seen by NASA's Solar Dynamics Observatory, showed a pair of filaments in the form of an arrow. The filaments appeared to remain stable as they rotated around to the far side of the sun. It takes approximately 25 days for the equator of the sun to complete a full revolution, though, because of its composition of plasma and gases, different areas of the sun rotate at different speeds. At its poles the sun rotates once every 36 days.