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Solar prominence seen in true color during totality of a solar eclipse. In solar physics , a prominence , sometimes referred to as a filament , [ a ] is a large plasma and magnetic field structure extending outward from the Sun 's surface, often in a loop shape.
Solar prominences, explains NASA, are large, bright loops of plasma anchored to the Sun's surface in the photosphere — the visible surface of the Sun — that extend into the Sun's outer ...
NASA's Parker Solar Probe is intended to approach the Sun to a distance of approximately 9.5 solar radii to investigate coronal heating and the origin of the solar wind. It was successfully launched on August 12, 2018 [ 36 ] and by late 2022 had completed the first 13 of more than 20 planned close approaches to the Sun. [ 37 ]
The slow solar wind is twice as dense and more variable in nature than the fast solar wind. [32] [38] The slow solar wind appears to originate from a region around the Sun's equatorial belt that is known as the "streamer belt", where coronal streamers are produced by magnetic flux open to the heliosphere draping over closed magnetic loops.
Pre-eruption structures originate from magnetic fields that are initially generated in the Sun's interior by the solar dynamo. These magnetic fields rise to the Sun's surface—the photosphere—where they may form localized areas of highly concentrated magnetic flux and expand into the lower solar atmosphere forming active regions.
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A video clip of an erupting solar prominence, a CME. A prominence is a large, bright, gaseous feature extending outward from the Sun's surface, often in the shape of a loop. Prominences are anchored to the Sun's surface in the photosphere and extend outwards into the corona.
Most solar flares and coronal mass ejections originate in these magnetically active regions around visible sunspot groupings. Similar phenomena indirectly observed on stars other than the Sun are commonly called starspots , and both light and dark spots have been measured.