Göttingen 2025 – wissenschaftliches Programm
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EP: Fachverband Extraterrestrische Physik
EP 5: Near-Earth Space I & Planets and Small Bodies II
EP 5.2: Vortrag
Dienstag, 1. April 2025, 16:30–16:45, ZHG005
Investigation of the occurrence of significant deviations in the magnetopause location: Solar wind and foreshock effects — •Niklas Grimmich1, Adrian Pöppelwerth1, Martin Owain Archer2, David Gary Sibeck3, Ferdinand Plaschke1, Wenli Mo4, Vicki Toy-Edens4, Drew Lawson Turner4, Hyangpyo Kim5, and Rumi Nakamura5 — 1Institut für Geophysik und Extraterrestrische Physik, Technische Universität Braunschweig, Braunschweig, Germany — 2Department of Physics, Imperial College London, London, UK — 3NASA Goddard Space Flight Center, Greenbelt, Maryland, USA — 4Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland, USA — 5Space Research Institute, Austrian Academy of Sciences, Graz, Austria
Recent studies have shown that some effects of upstream conditions on the location of the magnetopause may still be poorly understood, as deviations between empirical models and in situ observations are quite common. Using data from three multi-spacecraft missions to near-Earth space (Cluster, THEMIS and MMS), we can investigate the occurrence of these magnetopause observations. We test whether the deviant magnetopause crossings are statistically associated with foreshocks and/or different solar wind types, and show that in at least 40% of the cases the foreshock can be responsible for the large deviations in magnetopause position. In addition, two distinct classes of solar wind are found to be more frequently associated with the occurrence of magnetopause deviations: the "fast" solar wind and the solar wind plasma associated with transient events.
Keywords: Magnetopause; Foreshock; Solar Wind; Spacecraft observations