THEMIS observations of extreme magnetopause motion caused by a hot flow anomaly - Jacobsen,KS; Phan,TD; Eastwood,JP; Sibeck,DG; Moen,JI; Angelopoulos,V; McFadden,JP; Engebretson,MJ; Provan,G; Larson,D; Fornacon,K-H (JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 2009)