000007169 001__ 7169
000007169 005__ 20250102154303.0
000007169 037__ $$aPOSTER-2025-0002
000007169 100__ $$aRoco, Mario
000007169 245__ $$aLinking Solar Flare Observations to a Series of Impulsive Solar Energetic Particle Events Measured with Solar Orbiter at 0.5 AU
000007169 260__ $$c2024
000007169 269__ $$c2024-04-14
000007169 520__ $$aImpulsive solar energetic particle (SEP) events are typically associated with solar flares but the related particle injection and acceleration processes are still not well understood. We use in-situ and remote-sensing data from Solar Orbiter to establish a plausible link between a series of eruptions in a flaring region and a sequence of four SEP events measured at 0.5 AU between 5 and 6 March 2022. The direct comparison between these four events from the same source region allows to study the variability of the injected SEPs during an extended period of magnetic connectivity between Solar Orbiter and the flaring active region. In this study we analyze energetic electron, proton, and heavy ion data provided by the Energetic Particle Detector (EPD) suite onboard Solar Orbiter. Via a velocity dispersion analysis (VDA) of all measured particle species we estimate the solar event onset times which coincide with a series of solar eruptions that is observed by the Extreme Ultraviolet Imager (EUI) and the Spectrometer Telescope for Imaging X-rays (STIX) onboard Solar Orbiter. Further high-time-resolution EUV images and photospheric magnetic field information of the related active region is given by the Atmospheric Imaging Assembly (AIA) and the Helioseismic and Magnetic Imager (HMI) onboard the Solar Dynamics Observatory. Solar Orbiter and Earth were nearly perfectly radially aligned at this time which enabled this additional remote sensing by SDO. We find that the energy spectra of the heavy ion in-situ measurements show significant differences between the four investigated SEP events in terms of overall particle intensity, spectral slope, and 3He / 4He abundances. By comparison with the remote-sensing observations we find that the two stronger SEP events (with higher 3He / 4He ratios) are related to solar eruptions with a more complex eruption pattern leading to extended brightening and restructuring of coronal loop structures. These new detailed observations can be used as starting point for quantitative modelling of flare-associated energetic particle acceleration and release in active regions.
000007169 594__ $$aSTCE
000007169 700__ $$aJanitzek, Nils P. 
000007169 700__ $$aBerger, Lars
000007169 700__ $$aKühl, Patrick
000007169 700__ $$aHeidrich-Meisner, Verena
000007169 700__ $$aPacheco, Daniel
000007169 700__ $$aKollhoff, Alexander
000007169 700__ $$aMason, Glenn M. 
000007169 700__ $$aHo, George C.
000007169 700__ $$aRodríguez-Pacheco, Javier
000007169 700__ $$aGómez-Herrero, Raúl
000007169 700__ $$aRodríguez-García, Laura
000007169 700__ $$aHarra, Luoise
000007169 700__ $$aBarczynski, Krzysztof
000007169 700__ $$aWalsh, Andrew P.
000007169 700__ $$aZouganelis, Yannis
000007169 700__ $$aBerghmans, David
000007169 700__ $$aKrucker, Sam
000007169 700__ $$aBattaglia, Andrea Francesco
000007169 700__ $$aWimmer-Schweingruber, Robert F.
000007169 773__ $$t  European Geosciences Union General Assembly 2024 (EGU24), Vienna, Austria
000007169 8560_ $$fdavid.berghmans@ksb-orb.be
000007169 85642 $$ahttps://meetingorganizer.copernicus.org/EGU24/EGU24-11872.html
000007169 980__ $$aCPOSTER