EGU General Assembly 2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

Recurrent 3He-rich solar energetic particle injections observed by Solar Orbiter at ~0.5 au

Radoslav Bucik1, Glenn M. Mason2, Nariaki V. Nitta3, Vratislav Krupar4,5, Luciano Rodriguez6, George C. Ho2, Samuel T. Hart7,1, Maher A. Dayeh1, Javier Rodríguez-Pacheco8, Raúl Gómez-Herrero8, and Robert F. Wimmer-Schweingruber9
Radoslav Bucik et al.
  • 1Southwest Research Institute, San Antonio, TX, USA
  • 2Applied Physics Laboratory, Johnson Hopkins University, Laurel, MD, USA
  • 3Lockheed Martin Advanced Technology Center, Palo Alto, CA, USA
  • 4Heliophysics Science Division, NASA Goddard Space Flight Center, Greenbelt, MD, USA
  • 5Goddard Planetary Heliophysics Institute, University of Maryland, Baltimore, MD, USA
  • 6Solar-Terrestrial Center of Excellence–SIDC, Royal Observatory of Belgium, Brussels, Belgium
  • 7The University of Texas at San Antonio, San Antonio, TX, USA
  • 8Universidad de Alcalá, Space Research Group, Alcalá de Henares, Spain
  • 9Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, Kiel, Germany

We report Solar Orbiter observations of six recurrent solar energetic particle injections in 2022 March 3–6 at ~0.5 au. The injections were associated with jets emanating from a plage near a large sunspot in NOAA active region 12957. We saw large jets in injections with high 3He and Fe enrichments and minor jets in injections with no or lower enrichments. Furthermore, the event with the highest enrichment showed a more compact configuration of the underlying photospheric magnetic field. The higher fluences as well as harder spectra were seen in the event with a wider jet-like eruption. However, in this case, the buildup time might be required to produce such spectra. Extreme ultraviolet images from Solar Orbiter revealed a crisscrossing network at the base of jets not seen from 1 au that might be suitable for the recurrent events.

How to cite: Bucik, R., Mason, G. M., Nitta, N. V., Krupar, V., Rodriguez, L., Ho, G. C., Hart, S. T., Dayeh, M. A., Rodríguez-Pacheco, J., Gómez-Herrero, R., and Wimmer-Schweingruber, R. F.: Recurrent 3He-rich solar energetic particle injections observed by Solar Orbiter at ~0.5 au, EGU General Assembly 2023, Vienna, Austria, 24–28 Apr 2023, EGU23-9386,, 2023.