[P-CG19] Planetary Magnetosphere, Ionosphere, and Atmosphere

[PCG19-09] The first simultaneous observation of low energy ions and electrons at Mercury during the first BepiColombo flyby

*Sae Aizawa^1,2, Moa Persson¹, Nicolas Andre¹, Yuki Harada⁴, Yoshifumi Saito³, Dominique Delcourt⁵, Lina Z Hadid⁵, Markus Fraenz⁸, Shoichiro Yokota⁷, Andrei Fedorov¹, Emmanuel Penou¹, Alain Barthe¹, Jean Andre Sauvaud¹, Bruno Katra⁵, Shoya Matsuda⁶, Go Murakami³ (1.Institute de Recherche en Astrophysique et Planetologie, 2.Graduate School of Science, Tohoku University, 3.ISAS/JAXA, 4.Department of Geophysics, Graduate School of Science, Kyoto University, 5.Laboratoire de Physique des Plasmas, CNRS-Observatoire de Paris-Sorbonne Université-Université Paris Saclay-École polytechnique-Institut Polytechnique de Paris, 6.Graduate School of Natural Science and Technology, Kanazawa University, 7.Department of Earth and Space Science, Graduate School of Science, Osaka University, 8.Max-Planck-Institute for Solar System Research)

Keywords:BepiColombo, Mercury's magnetosphere

The first Mercury flyby by BepiColombo was successfully made on 1^st of October 2021 and this is the first time to have the simultaneous observation of low energy ions and electrons at Mercury. The data from Mercury Plasma Particle Experiment (MPPE) onboard Mio/BepiColombo shows (1) the compressed Mercury’s magnetosphere compared to the average of MESSENGER observations, (2) boundary motions around magnetopause crossings, (3) low-frequency waves in both dawn and dusk sides, and (4) high energy ions and electrons after the closest approach.