The circumsolar solar energetic particle event on 2022 January 2022, particle spread within and outside a magnetic cloud
- 1European Space Agency, European Space Astronomy Centre (ESAC), Camino Bajo del Castillo s/n, 28692 Villanueva de la Cañada, Madrid, Spain (laura.rodriguezgarcia@esa.int)
- 2Universidad de Alcalá, Space Research Group (SRG-UAH), Plaza de San Diego s/n, 28801 Alcalá de Henares, Madrid, Spain
- 3Department of Physics and Astronomy, University of Turku, 20014 Turku, Finland
- 4Heliophysics Science Division, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
- 5Physics and Astronomy Department, George Mason University, 4400 University Drive, Fairfax, VA 22030, USA
- 6Predictive Science Inc., 9990 Mesa Rim Road, Suite 170 San Diego, CA 92121, United States
- 7The Johns Hopkins University Applied Physics Laboratory, 11101 Johns Hopkins Road, Laurel, MD 20723, USA
- 8Jeremiah Horrocks Institute, University of Central Lancashire, Preston, United Kingdom
- 9University of California, Berkeley, Space Sciences Laboratory
- 10California Institute of Technology, Pasadena, CA 91125, USA
- 11National Observatory of Athens/IAASARS, I. Metaxa \& Vas. Pavlou, GR-15236, Penteli, Greece
On 2022 January 20, the Energetic Particle Detector on board Solar Orbiter detected a solar energetic particle (SEP) event showing unusual sunward-directed fluxes. Near-Earth spacecraft separated by 17° in longitude from Solar Orbiter measured classic antisunward-directed fluxes. Parker Solar Probe and MAVEN, separated by 130° and 216° respectively from Solar Orbiter, observed the particle event as well, suggesting a widespread event of nearly 360° in the heliosphere. The SEP event was associated with an M5-class X-ray flare and a CME with a speed of 1400 km/s. The energetic particles reached 3 MeV and 100 MeV energies for electrons and protons, respectively.
The aim of this study is to disentangle how the particles are able to spread throughout the heliosphere and how the local heliospheric conditions affect the acceleration and transport of the particles at different spacecraft locations. This work presents the observations and analyses that lead to a scenario in which the solar source injected energetic particles into the solar wind and within a preceding interplanetary coronal mass ejection (ICME) that was already present in the heliosphere at the time of the SEP event onset. In particular, Solar Orbiter measured the particles injected along the longest leg of an ICME still connected to the Sun at the time of the particle release.
How to cite: Rodríguez-García, L., Gómez-Herrero, R., Dresing, N., Balmaceda, L. A., Palmerio, E., Espinosa Lara, F., Kouloumvakos, A., Jebarah, I., Palmroos, C., Laitinen, T., Lee, C., Cohen, C., Fedeli, A., Cernuda, I., Roco, M., Malandraki, O., and Rodríguez-Pacheco, J.: The circumsolar solar energetic particle event on 2022 January 2022, particle spread within and outside a magnetic cloud, EGU General Assembly 2024, Vienna, Austria, 14–19 Apr 2024, EGU24-6131, https://doi.org/10.5194/egusphere-egu24-6131, 2024.
