SPEARHEAD Jan 1, 2024 Go to Project Site Webpage Follow Follow Follow SPEARHEAD logo Coronal Mass Ejection Galactic Cosmic Rays SEP Shock Solar Energetic Particles SPEARHEAD Jan Gieseler Senior Researcher Related SOLER The first ground-level enhancement of solar cycle 25 on 28 October 2021 Multi-spacecraft observations of the structure of the sheath of an interplanetary coronal mass ejection and related energetic ion enhancement Solar-MACH: An open-source tool to analyze solar magnetic connection configurations The 17 April 2021 widespread solar energetic particle event