SMuK 2023 – wissenschaftliches Programm
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EP: Fachverband Extraterrestrische Physik
EP 1: Planets and small Objects
EP 1.7: Vortrag
Montag, 20. März 2023, 12:30–12:45, HSZ/0004
Deformed bow shock and magnetic depression: Lessons from BepiColombo's flyby-2 at Mercury — •Daniel Schmid1, David Fischer1, Werner Magnes1, Yasuhito Narita1, Martin Volwerk1, Wolfgang Baumjohann1, Ayako Matsuoka2, Uli Auster3, Ingo Richter3, Daniel Heyner3, Ferdinand Plaschke3, and Rumi Nakamura1 — 1Istitut für Weltraumforschung (IWF) Graz, Österreichische Akademie der Wissenschaften (OeAW) — 2World Data Center for Geomagnetism, Kyoto University — 3Institut für Geophysik und Extraterrestrische Physik, Technische Universität Braunschweig
Understanding Mercury's magnetospheric structure remains a challenge due to the planet's proximity to the Sun. The magnetic field data from BepiColombo's flyby-2 at Mercury in June 2022 allows us to study the magnetosphere and its space environment in-situ. The bow shock crossing analysis reveals that the shock normal direction is significantly deformed during the inbound crossing and is comforting to the steady-state bow shock shape during the outbound crossing. The magnetosphere crossing analysis reveals a short-time magnetic field depression in the midnight sector before the closest approach, indicating either occurrence of a transient event or crossing of a current layer separating the dipolar from the tail-field region. The BepiColombo flyby-2 magnetic field data analysis shows that Mercury's magnetosphere is highly dynamic and identification of transient events from the quasi-steady state of the magnetosphere plays a crucial role in constructing the magnetospheric structure from the magnetic field data.