Understanding Low Geo-Effectiveness of Fast Halo CMEs in 2002 with EUHFORIA

Study investigates the puzzling low impact of fast halo CMEs associated with X-class flares in 2002 on Earth's magnetosphere. Despite high velocities, the weak geomagnetic effects were linked to a low Bz-component of the magnetic field, lack of relationship with longitude, and other factors. Utilizi

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