EGU General Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Multi-Spacecraft Observations of Gradual Solar Energetic Particle Events with Enhanced 3He Abundance

Radoslav Bucik1, Glenn M. Mason2, Raúl Gómez-Herrero3, Maher A. Dayeh1,4, Mihir I. Desai1,4, Samuel T. Hart4, George C. Ho2, David Lario5, Vratislav Krupar5,6, Robert F. Wimmer-Schweingruber7, Javier Rodríguez-Pacheco3, and Tilaye T. Asfaw8
Radoslav Bucik et al.
  • 1Southwest Research Institute, San Antonio, TX, USA (
  • 2Applied Physics Laboratory, Johns Hopkins University, Laurel, MD, USA
  • 3Universidad de Alcalá, Space Research Group, Alcalá de Henares, Spain
  • 4The University of Texas at San Antonio, San Antonio, TX, USA
  • 5Heliophysics Science Division, NASA Goddard Space Flight Center, Greenbelt, MD, USA
  • 6Goddard Planetary Heliophysics Institute, University of Maryland, Baltimore, MD, USA
  • 7Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, Kiel, Germany
  • 8NASA Johnson Space Center, Houston, TX, USA

Suprathermal ions from coronal jets, characterized by enhanced 3He and heavy-ion abundances, are an essential component of the seed population accelerated by coronal mass ejection (CME)-driven shocks in gradual solar energetic particle (GSEP) events. However, the mechanisms through which CME-driven shocks gain access to these suprathermal ions and produce spectral and abundance variations in GSEP events remain largely unexplored. We study GSEP events simultaneously measured on at least two spacecraft, such as ACE, STEREO, and Solar Orbiter, where 3He finite mass peak is measured at least on one spacecraft. This presentation discusses the origin of vastly different abundances and spectral shapes in terms of variable remnant population from preceding impulsive SEP events. Furthermore, with the help of imaging observations from SDO and STEREO, we examine a possible direct contribution from parent active regions of GSEP events.

How to cite: Bucik, R., Mason, G. M., Gómez-Herrero, R., Dayeh, M. A., Desai, M. I., Hart, S. T., Ho, G. C., Lario, D., Krupar, V., Wimmer-Schweingruber, R. F., Rodríguez-Pacheco, J., and Asfaw, T. T.: Multi-Spacecraft Observations of Gradual Solar Energetic Particle Events with Enhanced 3He Abundance, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-6726,, 2022.