MAGNETIC FILAMENT: A long and sinuous filament of magnetism is snaking over the sun’s western limb. NASA’s Solar Dynamics Observatory captured the 200,000 km-long structure in mid-twist on the morning of March 18th:
Long filaments like this one are often unstable. If this one erupts, it could hurl pieces of itself toward Earth. More likely, the filament will continue to wind over the western limb, active but intact. Either way it’s a good show.