Speaker
Description
First Name: Jana
Last Name: Markovic
Affiliation: University of Alcalá
All Authors: Markovic, Jana; Gómez-Herrero, Raúl; Cernuda Cangas, Ignacio; Espinosa Lara, Francisco; Rodríguez García, Laura; Carcaboso Morales, Fernando; Rodríguez-Pacheco, Javier; Wimmer-Schweingruber, Robert; Ho, George
Abstract: On March 25 and 26, 2025, the EPD instrument suite onboard Solar Orbiter (SolO) detected electron flux enhancements when the s/c was located ~16º below the heliographic equator and at 0.32 au heliocentric distance. The increase on March 25 comprised at least two consecutive solar electron energetic events originating from Active Region 14028, located at S16W83. The first injection showed a narrow time profile and highly anisotropic electron fluxes, observed at energies <110 keV by the sunward-pointing EPD/EPT and EPD/STEP telescopes. It was associated with a type III radio burst observed by RPW at 08:07 UTC. The event on March 26, originating from the same active region, showed more gradual time profile, less pronounced anisotropies and much harder energy spectra, reaching energies above 400 keV, with a significant increase in the flux registered by the EPD/HET telescope. It was associated with a type III radio burst observed by RPW at 09:05 UTC. In-ecliptic observations at ~1 au by STEREO-A and near-Earth s/c showed much clearer increase during the March 26 event, suggesting changing magnetic connectivity or different interplanetary transport conditions. Given their common solar origin, the multi-spacecraft configuration, particularly SolO’s high-latitude vantage point, offers an exceptional opportunity to study 3D SEP distribution and the causes of the observed differences.