Abstract: In this work we investigate a series of six 3He-rich events that were observed by Solar Orbiter on 10/29/2022-10/30/2022. We find possible candidates for the solar sources of such events and present a Differential Emission Measure (DEM) analysis to further characterize the plasma conditions that led to their eruption. By comparing the plasma properties of the six events, we can compare the distinct characteristics of each of the sources that could have led to more 3He enhancement.
This study demonstrates that there is a temperature range (1.86-4.1MK) which is associated with 3He enhancement. Our results show that 3He enrichment depends not only on temperature, but also on the thermal structure of the plasma, particularly the width and peak temperature of individual thermal populations. We also find that events with lower 3He enrichment correspond to cooler plasma temperatures. Additionally, we found no significant correlation between the 3He/4He ratio and the mean DEM temperature for ions between 0.2-10MeV/n.