FIP bias in a sigmoidal active region. Issue Volume 8:Issue S300(2013) (6th January 2014)

• Record Type: Journal Article
• Authors: Baker, D.; Brooks, D. H.; Démoulin, P.; van Driel-Gesztelyi, Lidia; Green, L. M.; Steed, K.; Carlyle, J.
• Is Part Of: Proceedings of the International Astronomical Union. Volume 8:Issue S300(2013)
• Page Start: 222
• Page End: 226
• Publication Date: 2014-01-06
• Subjects: Sun: abundances, -- Sun: active region, -- Sun: coronal hole, -- solar wind; Astronomy -- Congresses; Astronomy -- Periodicals; 520
• DOI: 10.1017/S1743921313011009
• Languages: English
• ISSNs: 1743-9213

Abstract

Abstract: We investigate first ionization potential (FIP) bias levels in an anemone active region (AR) - coronal hole (CH) complex using an abundance map derived from Hinode /EIS spectra. The detailed, spatially resolved abundance map has a large field of view covering 359″ × 485″. Plasma with high FIP bias, or coronal abundances, is concentrated at the footpoints of the AR loops whereas the surrounding CH has a low FIP bias, ~1, i.e. photospheric abundances. A channel of low FIP bias is located along the AR's main polarity inversion line containing a filament where ongoing flux cancellation is observed, indicating a bald patch magnetic topology characteristic of a sigmoid/flux rope configuration.