Fig. 10.
(a) Footpoint of event One observed by ACE traced back on the spectroscopic image taken by EIT 284 Å, SOHO; (b) Footpoint of event Two observed by ACE traced back on the spectroscopic image taken by AIA 171 Å, SDO; (c) PFSS investigation of CR 2055; (d) PFSS investigation of CR 2110. In c and d, the open field lines are in cyan (magenta) when negative (positive); the closed field lines are in black. The green square is the PFSS region focused on.
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