Signature and escape of highly fractionated plasma in an active region

ABSTRACT Accurate forecasting of space weather requires knowledge the source regions where solar energetic particles (SEP) and eruptive events originate. Recent work has linked several major SEP in 2014, January, to specific features host active region (AR 11944). In particular, plasma composition measurements around footpoints hot, coronal loops core were able explain values later measured situ by Wind spacecraft. Due important differences elemental between SEPs wind, magnitude Si/S abundance ratio emerged as a key diagnostic seed population wind locations. We seek understand if results are typical other regions, even they not sources or productive. this paper, we use novel analysis technique, together with an evolutionary magnetic field model, new approach investigate 11150), identify locations highly fractionated (high ratio) plasma. Material confined near loops, AR 11944, that case have expanded periphery, show signature, can be released from opened reconnection at boundary. Since fundamental characteristics closed being boundary is process likely general.