We review recent work on 111 Fe-rich impulsive solar energetic ( \sim 3 MeV/nuc ) particle ( SEP ) events observed from 1994 to 2013 .
Strong elemental abundance enhancements scale with A/Q , the ion mass-to-charge ratio , as ( A/Q ) ^ { \alpha } , where 2 < \alpha < 8 for different events .
Most Fe-rich events are associated with both flares and coronal mass ejections ( CMEs ) , and those with larger \alpha are associated with smaller flares , slower and narrower CMEs , and lower SEP event fluences .
The narrow equilibrium temperature range required to fit the observed A/Q enhancements is 2.5–3.2 MK , far below the characteristic flare temperatures of > 10 MK .
Only a small number of SEP events slightly outside this temperature range were found in an expanded search of impulsive Fe-rich events .
Event characteristics are similar for events isolated in time and those occurring in clusters .
The current challenge is to determine the solar sources of the Fe-rich events .
Ambient coronal regions in the 2.5–3.2 MK range are broadly distributed both in and outside active regions .
We explore the possibility of acceleration from thermal plasmas at reconnecting current sheets in the context of observed standard and blowout jets .
Recent current sheet reconnection modelling provides a basis for the A/Q enhancements .