Longitudinal configurations of spacecraft and source active regions for each of the analysed events. The arrow marks the longitude of the flaring source active region, the dotted black spiral is the nominal Parker field line originating from the source region. The colored spirals represent the magnetic field lines connecting the spacecraft to the Sun, corresponding to the measured solar wind speed. The dotted colored lines mark the longitudinal positions of each spacecraft, where blue marks STEREO B, red STEREO A, and green ACE.