Temperature of source regions of $^3$He-rich impulsive solar energetic particle events

摘要

Impulsive solar energetic particle (SEP) events originate from the energydissipation process in small solar flares. Anomalous abundances in impulsiveSEP events provide an evidence on unique, yet unclear, acceleration mechanism.The pattern of heavy-ion enhancements indicates that the temperature of thesource plasma that is accelerated is low and not flare-like. We examine thesolar source of the $^3$He-rich SEP event of 2012 November 20 using SolarDynamics Observatory (SDO)/ Atmospheric Imaging Assembly (AIA) images andinvestigate its thermal variation. The examined event is associated withrecurrent coronal jets. The Differential Emission Measure (DEM) analysis isapplied to study the temperature evolution/distribution of the source regions.Preliminary results show that the temperature of the associated solar source isranged between 1.2-3.1 MK.