Solar plage

Source: Wikipedia, the free encyclopedia.
Plage often appear as bright patches around active regions in the chromosphere. Plage are commonly observed around or surrounding sunspots, as both are phenomena associated with active regions.

A plage

active regions. Historically, they have been referred to as bright flocculi, in contrast to dark flocculi, and as chromospheric faculae, in contrast to photospheric faculae.[1]

Etymology

The term plage is often believed to be poetically taken from the French word for "beach"; however, this is likely a misunderstanding of an 1893 article by Henri-Alexandre Deslandres where the name facular flames was suggested. In the article, Deslandres also refers to them as plages brillantes, meaning bright regions, which became the more commonly used term.[2]

Description

Classically plage have been defined as regions that are bright in

photospheric magnetic field concentration of the faculae below. The magnetic field of plage is confined to the intergranular lanes in the photosphere with a strength of around 1500 G, but expands into a volume filling canopy in the chromosphere with a field of around 450G.[3][4]

It is believed that plage is formed from decaying emerging flux regions, and often acts as a footprint for coronal loops and fibrils, which makes them an important interface for

See also

References

External links