Solar plage
Aplage/pleɪdʒ/is a bright region in theSun'schromosphere,typically found in and aroundactive regions.Historically, they have been referred to asbright flocculi,in contrast todark flocculi,and aschromospheric faculae,in contrast tophotospheric faculae.[1]
Etymology
[edit]The termplageis often believed to be poetically taken from the French word for "beach"; however, this is likely a misunderstanding of an 1893 article byHenri-Alexandre Deslandreswhere the namefacular flameswas suggested. In the article, Deslandres also refers to them asplages brillantes,meaningbright regions,which became the more commonly used term.[2]
Description
[edit]Classically, plage have been defined as regions that are bright inHαand other chromosphericemission lines.With modern imaging, most researchers now identify plage based on thephotosphericmagnetic field concentration of thefaculaebelow. 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 forcoronal heating.[2]
See also
[edit]References
[edit]- ^Athay, R. Grant; Warwick, Constance S. (1961)."Indices of Solar Activity".In Landsberg, Helmut E.; Van Mieghem, J. (eds.).Advances in Geophysics.Vol. 8. Elsevier Science. p. 30.ISBN9780080568362.
- ^abPietrow, A.G.M. (2022).Physical properties of chromospheric features: Plage, peacock jets, and calibrating it all(PhD). Stockholm University.doi:10.13140/RG.2.2.36047.76968.
- ^Pietrow, A. G. M.; Kiselman, D.; de la Cruz Rodríguez, J.; Díaz Baso, C. J.; Pastor Yabar, A.; Yadav, R. (2020). "Inference of the chromospheric magnetic field configuration of solar plage using the Ca II 8542 Å line".Astronomy and Astrophysics.644:644.arXiv:2006.14486.Bibcode:2020A&A...644A..43P.doi:10.1051/0004-6361/202038750.S2CID220055853.
- ^Morosin, Roberta; de la Cruz Rodríguez, Jaime; Vissers, Gregal J. M.; Yadav, Rahul (2020). "Stratification of canopy magnetic fields in a plage region. Constraints from a spatially-regularized weak-field approximation method".Astronomy and Astrophysics.642:642.arXiv:2006.14487.Bibcode:2020A&A...642A.210M.doi:10.1051/0004-6361/202038754.S2CID220055552.
External links
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