We examine in detail the evolution of an anemone active region (AR) that emerged in a Coronal Hole and the related flares, CMEs, and the geomagnetic storm to elucidate how such a magnetic configuration works to generate a geo-effective flares/CMEs. We found that the fast CMEs are probably a consequence of the eruption inside a Coronal Hole from an sea anemone AR, and discuss the importance of ARs that show the anemone structure for the space weather studies.
Asai, A. et al. (2009)
The Journal of Geophysical Research, 114, A00A21, doi:10.1029/2008JA013291.
Abstract / Article on web(JGR web-page)

