Image Credit & Copyright:
jp-Brahic
Explanation:
Dramatic prominences can sometimes be seen looming just beyond the edge of the
sun. Such was the case last week as a large prominence, visible above,
highlighted a highly active recent Sun. A waving sea of hot gas is visible in
the foreground chromosphere in great detail as it was imaged in one specific
color of light emitted by hydrogen. A solar prominence is a cloud of solar gas
held just above the surface by the Sun's magnetic field. The Earth, illustrated
in the inset, is smaller than the prominence. Although very hot, prominences
typically appear dark when viewed against the Sun, since they are slightly
cooler than the photosphere below them. A quiescent prominence typically lasts about
a month, and may erupt in a Coronal Mass Ejection (CME) expelling hot gas into
the Solar System, some of which may strike the Earth and trigger auroras.
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