magnetic fields above a solar
this dark filament stretches over 40
The ominous structure appears to be frozen in time
the Sun's edge, but solar filaments are unstable and often erupt.
The detailed scene was captured on May 18 in
light by cameras on board the
While the cooler plasma of the
hotter, brighter plasma
below traces magnetic field lines emerging from the active region.
When seen arcing above the edge of the Sun,
filaments actually look bright against the dark background of space and
are called prominences.
SDO AIA Team