Greifswald 2024 – wissenschaftliches Programm

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EP: Fachverband Extraterrestrische Physik

EP 7: Sun and Heliosphere II

EP 7.1: Vortrag

Donnerstag, 29. Februar 2024, 14:00–14:15, ELP 6: HS 2

New results on solar energetic electron events obtained from combined in-situ and remote-sensing observations from Solar Orbiter — •Alexander Warmuth and Frederic Schuller — Leibniz-Institut für Astrophysik Potsdam (AIP)

We present the first statistical results on energetic electron events obtained by joint observations of remote-sensing and in-situ instruments on Solar Orbiter. We use the Energetic Particle Detector (EPD) to measure the properties of the electrons (time profile, anisotropy, inferred injection time at the source, etc.), as well as to determine the composition of the associated energetic ions. 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 have compiled a large sample of 330 events 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 0.3 au to 1 au. For the first time, this allows us to study the relationship between energetic electron events and associated flares as a function of heliocentric distance. This is crucial to constrain particle propagation effects.

Keywords: Sun: particle emission; Sun: flares; Sun: heliosphere; Sun: X-rays, gamma-ray; Sun: radio radiation