Characteristics of merging at the magnetopause inferred from dayside 557.7-nm all-sky images:: IMF drivers of poleward moving auroral forms - Maynard,NC; Burke,WJ; Ebihara,Y; Ober,DM; Wilson,GR; Siebert,KD; Winningham,JD; Lanzerotti,LJ; Farrugia,CJ; Ejiri,M; Reme,H; Balogh,A; et al. (ANNALES GEOPHYSICAE, 2006)