The event exhibited non linear interaction between consecutive CMEs via a magic recipe to form a “perfect storm” extreme event, in which: An earlier large CME should occur at the right time in order to have a minimal deceleration of the later CMEs. It should occur neither too early nor too late. Second, the later CMEs should be launched in quick succession. They interact as close to the Sun as possible, so their expansion would be inhibited after the eruptions. The fast transit to 1 AU would significantly reduce the time for them to expand as well. Liu et al., 2014 July 2012 event
What is the environment that leads to such efficient particle acceleration? A special magnetic configuration leading to a two-stage eruption within a short period of time (STB, STA, SDO)
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