FIP bias in a sigmoidal active region
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.
- Publication:
-
Nature of Prominences and their Role in Space Weather
- Pub Date:
- January 2014
- DOI:
- 10.1017/S1743921313011009
- Bibcode:
- 2014IAUS..300..222B
- Keywords:
-
- Sun: abundances;
- Sun: active region;
- Sun: coronal hole;
- solar wind