Today at the EGU General Assembly 2026, Dr. Manon Jarry (Postdoctoral researcher at NOA) delivered an oral presentation in the session “ST1.8 Acceleration and Transport of Suprathermal and Energetic Particles in the Heliosphere”. Her talk, titled “Proton acceleration by CME-driven shock during the 21 November 2024 (GLE76) event”, focused on one of the most intriguing recent solar energetic particle events.
The 21 November 2024 SEP event (GLE76) was particularly remarkable: despite originating from the far side of the Sun, it produced >100 MeV protons observed near Earth.
Because of its position, the associated flare showed only weak signatures in Earth-based X-ray observations. However, instruments such as Solar Orbiter (STIX) detected enhanced emission, offering crucial complementary data.
The event was associated with a fast coronal mass ejection (CME) (~1436 km/s) driving a shock wave. By combining remote-sensing observations from SOHO and STEREO-A with advanced magnetohydrodynamic (MHD) simulations, the team reconstructed the 3D geometry and physical properties of the shock.
This approach allowed researchers to map how different spacecraft – including Earth, STEREO-A, and Solar Orbiter – were magnetically connected to different regions of the evolving shock.
By linking shock properties with in-situ particle measurements, the study explored how energetic particles were accelerated and transported across the heliosphere. These results provide important insights into SEP acceleration mechanisms and improve our ability to interpret complex space weather events.
The presentation attracted significant attention at EGU26, sparking many questions and lively discussions with participants. The strong interest highlights the relevance of this work for the heliophysics and space weather communities.