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

First results on interplanetary electron events obtained by joint observations of remote-sensing and in-situ instruments on Solar Orbiter

Alexander Warmuth1, Frederic Schuller1, Raúl Gómez-Herrero2, Javier Rodríguez-Pacheco2, Fernando Carcaboso3, Sam Krucker4, Daniel Pacheco5, Robert Wimmer-Schweingruber5, Alexander Kollhoff5, Nina Dresing6, Annamaria Fedeli6, David Paipa7, Milan Maksimovic7, Nicole Vilmer7, Krzysztof Barczynski8, Olena Podladchikova1, Glenn Mason9, Alexis Rouillard10, and the Joint STIX-EPD-RPW-EUI Working Group*
Alexander Warmuth et al.
  • 1Leibniz Institute for Astrophysics Potsdam (AIP), Potsdam, Germany
  • 2Universidad de Alcalá, Space Research Group, Alcalá de Henares, Spain
  • 3NASA Goddard Space Flight Center, Greenbelt, MD, USA
  • 4University of Applied Sciences and Arts Northwestern Switzerland, Windisch, Switzerland
  • 5Institut für Experimentelle und Angewandte Physik, Christian- Albrechts-Universität zu Kiel, Kiel, Germany
  • 6Department of Physics and Astronomy, University of Turku, Turku, Finland
  • 7LESIA, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, Université de Paris, Paris, France
  • 8Physikalisch-Meteorologisches Observatorium Davos, World Radiation Center, Davos, Switzerland
  • 9Johns Hopkins University Applied Physics Laboratory, Laurel, MD, USA
  • 10IRAP, Université de Toulouse, CNRS, CNES, UPS, Toulouse, France
  • *A full list of authors appears at the end of the abstract

Impulsive electron events observed in interplanetary space are believed to be generated by acceleration in solar flares. This notion has been supported by correlations between the characteristics of energetic electrons detected in-situ near 1 au and those in solar flares derived from hard X-ray observations. However, the details of this relation are still unclear, presumably because of the complex combination of acceleration, injection, and transport effects that are involved.

We present the first statistical results on impulsive electron events obtained by joint observations of remote-sensing and in-situ instruments on Solar Orbiter. We use the suite Energetic Particle Detector (EPD) to measure the properties of the electrons (time profile, anisotropy, maximum energy, inferring the injection time at the source, etc.), as well as to determine the particularities of the composition in the suprathermal energy range. Also, X-ray observations from the Spectrometer/Telescope for Imaging X-rays (STIX) constrain the energetic electrons in the solar flare in terms of timing, spectrum, and location. Type III radio bursts detected by the Radio and Plasma Waves (RPW) instrument are used to link the nonthermal X-ray peaks to the interplanetary electron beams. Finally, the Extreme Ultraviolet Imager (EUI) provides context on the flare evolution. We use a large event sample obtained during the first 2.5 years of the Solar Orbiter mission, which covers a wide range of radial distances ranging from as close as 0.33 au to 1.02 au.

Joint STIX-EPD-RPW-EUI Working Group:

Andrea Battaglia, Radoslav Bucik, Hannah Collier, Oleksiy Dudnik, George C. Ho, Matthieu Kretzschmar, Vratislav Krupar, David Lario, Camille Lorfing, Sophie Musset, Hamish Reid, Luciano Rodriguez, Antonio Vecchio

How to cite: Warmuth, A., Schuller, F., Gómez-Herrero, R., Rodríguez-Pacheco, J., Carcaboso, F., Krucker, S., Pacheco, D., Wimmer-Schweingruber, R., Kollhoff, A., Dresing, N., Fedeli, A., Paipa, D., Maksimovic, M., Vilmer, N., Barczynski, K., Podladchikova, O., Mason, G., and Rouillard, A. and the Joint STIX-EPD-RPW-EUI Working Group: First results on interplanetary electron events obtained by joint observations of remote-sensing and in-situ instruments on Solar Orbiter, EGU General Assembly 2023, Vienna, Austria, 24–28 Apr 2023, EGU23-7482,, 2023.