Solar sources of impulsive solar energetic particle events with high 3He content

Impulsive solar energetic particle (SEP) events are characterized by compositional anomalies, the highly elevated ³He/⁴He ratio in particular. They also tend to be abundant in heavy elements and electrons.  It is still not clear how impulsive SEP (ISEP) events are produced, largely because of the difficulty of finding their solar sources.  It is true that they are often identified as coronal jets, energetically much less pronounced than solar flares, which are found around the times of type III radio bursts in the decametric-hectometric wavelength range. But in a small number of ISEPs observed by Solar Orbiter, search of the solar source seems to be not hopeful.  In this work we try to find the solar sources of the ISEPs with high ³He flux as  published by Kouloumvakos et al. (2025). We first concentrate on those events that occurred while Solar Orbiter was magnetically connected to the part of the Sun visible from Earth so that we can make use of multi-channel SDO/AIA data. To explore the effect of spatial resolution on the detectability of the source region, we study ISEPs that were observed when Solar Orbiter was close to the Sun and the likely source regions happened to be in the field of view of EUI/HRI. Lastly we investigate the relation of dropouts in ions and electrons with the properties of the source regions.