Würzburg 2018 – wissenschaftliches Programm
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EP: Fachverband Extraterrestrische Physik
EP 4: Sun and Heliosphere II - Dynamics (MHD, Particles)
EP 4.2: Vortrag
Mittwoch, 21. März 2018, 11:15–11:30, BSZ - Pabel HS
The Ground Level Event on September 10, 2017 — •D. Galsdorf1, S. Burmeister1, N. Dresing1, R. Goméz-Herrero2, J. Guo1, B. Heber1, K. Herbst1, A. Klassen1, P. Kühl1, R. Müller-Mellin1, and R. Wimmer-Schweingruber1 — 1Christian-Albrechts-Universität zu Kiel, Germany — 2Universidad de Alcalá, Madrid, Spain
Ground level events (GLEs) are the most energetic solar particle events (SEPs). On September 10, 2017 at 15:35~UT a X8.2~X-ray flare from the active region 2673 (S09, W91) was detected that peaked at 16:06 UT. The event was accompanied by a coronal and IP type II radio burst starting at 15:49 UT followed by IP type III radio bursts starting at 15:53 UT and a coronal mass ejection. The event onsets of near relativistic electrons have been detected at 16:06 UT and 21:38 UT at SOHO and STEREO A, respectively. In contrast to observations close to the Earth no strong SEP anisotropies have been observed at STEREO A. The neutron monitor network (NMN) recorded the second GLE for solar cycle 24 with an onset at 16:10 UT at Fort Smith. DOSIS 3d aboard the international space station showed an increase in the dose rate at low cutoff rigidities. The Electron Proton Helium INstrument on board SOHO measured protons with energies of more than 700 MeV. The analysis of the NMN indicates that the interplanetary field direction pointed to areas over South America. The biggest increase of 12% was measured by DOMC with an onset time of 17:03 UT. Data observed at Earth and the longitudinal structure in the inner heliosphere will be discussed.