标题： 2024 年母亲节风暴期间日侧磁层顶的原子和分子氮离子 显示英文标题

标题： Atomic and Molecular Nitrogen Ions at the Dayside Magnetopause During the 2024 Mother's Day Storm

摘要： 使用磁层多尺度任务（MMS-HPCAs）的热等离子体成分分析仪在母亲节风暴（加农风暴）期间（2024年5月10日至13日）进行的离子测量，首次观测到了地球白天外磁层中的原子和分子氮离子。还测量到了被识别为双电荷氮和氧的离子群体。这些观测是在风暴早期恢复阶段，磁层高度压缩、地心距离约为6个地球半径的情况下进行的。从离子成分测量和伴随的磁场数据中，我们确定了磁层顶的重联率；我们将这一结果与仅假设存在原子氧和氢的模型重联率进行了比较。磁层中的富含重离子的质量密度大于磁鞘中受冲击的太阳风质量密度。尽管如此，磁层顶仍然发生了磁重联。 显示英文摘要

摘要： Ion measurements made with the Hot Plasma Composition Analyzers of the Magnetospheric Multiscale Mission (MMS-HPCAs) during the Mother's Day Storm (Gannon Storm) of 10-13 May 2024 yield the first observations of atomic and molecular nitrogen ions in the Earth's dayside outer magnetosphere. A population of ions identified as doubly charged nitrogen and oxygen was also measured. These observations were made within a highly compressed magnetosphere at a geocentric distance of ~6 Earth Radii during the early recovery phase of the storm. From the ion composition measurements and accompanying magnetic field data, we determine the reconnection rate at the magnetopause; we compare this result to a model reconnection rate that assumes the presence of only atomic oxygen and hydrogen. The heavy ion-laden-mass density in the magnetosphere was greater than the shocked solar wind mass density in the magnetosheath. Despite these conditions, magnetic reconnection still occurred at the magnetopause.