Image Credit: NASA Solar Dynamics
Observatory
Explanation:
This week the Sun gave up its strongest solar flare so far in 2013, accompanied
by a coronal mass ejection (CME) headed toward planet Earth. A false-color
composite image in extreme ultraviolet light from the Solar Dynamics
Observatory captures the moment, recorded on April 11 at 0711 UTC. The flash, a
moderate, M6.5 class flare erupting from active region AR 11719, is near the
center of the solar disk. Other active regions, areas of intense magnetic
fields seen as sunspot groups in visible light, mottle the surface as the solar
maximum approaches. Loops and arcs of glowing plasma trace the active regions'
magnetic field lines. A massive cloud of energetic, charged particles, the CME
will impact the Earth's magnetosphere by this weekend and skywatchers should be
on the alert for auroral displays.
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