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We discuss how some coronal mass ejections (CMEs) originating from thewestern limb of the Sun are associated with space weather effects such as solarenergetic particles (SEPs), shock or geo-effective ejecta at Earth. We focus onthe August 24, 2002 coronal mass ejection, a fast (~ 2000 km/s) eruptionoriginating from W81. Using a three-dimensional magneto-hydrodynamic simulationof this ejection with the Space Weather Modeling Framework (SWMF), we show howa realistic initiation mechanism enables us to study the deflection of the CMEin the corona and the heliosphere. Reconnection of the erupting magnetic fieldwith that of neighboring streamers and active regions modify the solarconnectivity of the field lines connecting to Earth and can also partly explainthe deflection of the eruption during the first tens of minutes. Comparing theresults at 1 AU of our simulation with observations by the ACE spacecraft, wefind that the simulated shock does not reach Earth, but has a maximum angularspan of about 120$^\circ$, and reaches 35$^\circ$ West of Earth in 58 hours. Wefind no significant deflection of the CME and its associated shock wave in theheliosphere, and we discuss the consequences for the shock angular span.

The August 24, 2002 Coronal Mass Ejection: When a Western Limb Event Connects to Earth