Japan Geoscience Union Meeting 2019

Presentation information

[J] Oral

P (Space and Planetary Sciences ) » P-CG Complex & General

[P-CG25] Planetary Magnetosphere, Ionosphere, and Atmosphere

Tue. May 28, 2019 10:45 AM - 12:15 PM A05 (TOKYO BAY MAKUHARI HALL)

convener:Kanako Seki(Graduate School of Science, University of Tokyo), Takeshi Imamura(Graduate School of Frontier Sciences, The University of Tokyo), Hiroyuki Maezawa(Department of Physical Science Osaka Prefecture University), Naoki Terada(Graduate School of Science, Tohoku University), Chairperson:Hiromu Nakagawa(Planetary Atmosphere Physics Laboratory, Department of Geophysics, Graduate School of Science, Tohoku University), Kanako Seki( Department of Earth and Planetary Science, Graduate School of Science, University of Tokyo,)

11:00 AM - 11:15 AM

[PCG25-06] A Novel High-Moment Multifluid Model for Mercury: From the Planetary Conducting Core to the Dynamic Magnetosphere

*Chuanfei Dong1, Liang Wang1, Ammar Hakim1, Amitava Bhattacharjee1, James A Slavin2, Gina A DiBraccio3, Kai Germaschewski4 (1.Princeton University, 2.University of Michigan, Ann Arbor, 3.NASA Goddard Space Flight Center, 4.University of New Hampshire)

Keywords:Mercury's dynamic magnetosphere, ten-moment multifluid model, induction effect, tightly coupled interior-magnetosphere system, collisionless magnetic reconnection, extreme events

We have developed a novel three-dimensional ten-moment multifluid model and applied it to investigate the tightly coupled interior-magnetosphere system of Mercury. This new multifluid model self-consistently solves the continuity, momentum and pressure tensor equations of each species, together with the full Maxwell equations. As a result, non-ideal effects including the Hall effect, inertia, and tensorial pressures are self-consistently embedded without the need for explicitly solving a generalized Ohm's law.

Our simulation results from this new model are in good agreement with observations from MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) spacecraft. The model is able to reproduce the magnetic field vectors, field-aligned currents and cross-tail current sheet asymmetry observed by MESSENGER. We also investigate collisionless magnetic reconnection in Mercury's magnetotail and at dayside magnetopause. In addition, we study the magnetospheric response of Mercury to a hypothetical extreme event with an enhanced solar wind dynamic pressure, which demonstrates the significance of electromagnetic induction effects resulting from the coupled interior. Moreover, two plasmoids (or flux ropes) are formed in Mercury's cross-tail current sheet during this hypothetical extreme event, indicating the extremely dynamic nature of Mercury's magnetotail. Thus, this novel high-moment, multifluid, interior-magnetosphere-coupled model is crucial for understanding Mercury's dynamic magnetosphere and has the potential to enhance the science returns of both the MESSENGER and BepiColombo missions.