| Autor: |
Wang, Jing, Yu, Jiang, Xu, Xiaojun, Cui, Jun, Cao, Jinbin, Ye, Yudong, Xu, Qi, Wang, Ming, Zhou, Zilu, Chang, Qing, Xu, Jiaying, Wang, Xing |
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| Zdroj: |
Geophysical Research Letters; 11/16/2021, Vol. 48 Issue 21, p1-11, 11p |
| Abstrakt: |
The Martian‐induced magnetopause (IMP), characterized by the sudden changes of magnetic fields and ion compositions, is the transition boundary separating the magnetosheath from Martian induced magnetosphere. Based on the magnetic field and plasma measurements by Mars Atmosphere and Volatile EvolutioN, we for the first time report a magnetic reconnection at the dayside IMP. The clear plasma jet and bipolar Hall magnetic field provide solid evidence for the identification of the magnetic reconnection. Our observations demonstrate that the newly arrived interplanetary magnetic field and the anchored magnetic field in the induced magnetosphere can reconnect with each other at the IMP. Such reconnection allows the planetary ions to escape from Mars through the reconnected magnetic fields across the IMP, resulting in a significant increase in the local loss rate of the ionospheric ions. Plain Language Summary: Magnetic reconnection is one of the most important topics in space physics since it can not only alter the topology of the magnetic field but also quickly convert magnetic energy to kinetic energy. Around Mars, magnetic reconnections are identified in various regions, such as the induced magnetosphere, ionosphere, magnetotail. However, the magnetic reconnection on the Martian induced magnetopause, which separates the induced magnetosphere from the shocked solar wind, has not been reported and analyzed yet. In this letter, we for the first time report a magnetic reconnection at the Martian magnetopause with Hall magnetic field and ion jet flow. The magnetic reconnections on the magnetopause are crucial because they can accelerate planetary heavy ions in the induced magnetosphere or ionosphere to facilitate their escape from Mars. Key Points: Magnetic reconnection at the Martian induced magnetopause is reportedHall magnetic field associated with the reconnection are detected by Mars Atmosphere and Volatile EvolutioNThe thickness of the reconnection region and local oxygen loss rate are estimated to be 575 km and ∼1.0⋅1024s−1, respectively [ABSTRACT FROM AUTHOR] |
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