论文标题
偶极化是磁尾等离子体射流前部的典型特征吗？
Are Dipolarization Fronts a Typical Feature of Magnetotail Plasma Jets Fronts?
论文作者
论文摘要
等离子体喷射在地球的磁尾中无处不在。等离子喷射前（JFS）是粒子加速度和能量转换的所在地。 JF通常与代表磁场北部成分孤立锐利和强大增加的偶极法（DFS）相关。但是，MHD和动力学不稳定性可以在JFS上发展，并干扰前面结构，这些结构质疑JFS的DFS。我们使用5年（2017-2021）在地球磁尾中CPS中对JFS的结构进行了研究。我们编制了一个2394 CPS喷气机的数据库。我们发现，JF的大约一半（42 \％）与$ b_z $中的幅度更改有关。 DFS构成了这些大振幅事件的四分之一，而其余的则与更复杂的磁场结构有关。我们得出的结论是，JFS的DFS的``古典图片''并不是最常见的情况。
Plasma jets are ubiquitous in the Earth's magnetotail. Plasma jet fronts (JFs) are the seat of particle acceleration and energy conversion. JFs are commonly associated with dipolarization fronts (DFs) representing solitary sharp and strong increases in the northward component of the magnetic field. However, MHD and kinetic instabilities can develop at JFs and disturb the front structure which questions on the occurrence of DFs at the JFs. We investigate the structure of JFs using 5 years (2017-2021) of the Magnetospheric Multiscale observations in the CPS in the Earth's magnetotail. We compiled a database of 2394 CPS jets. We find that about half (42\%) of the JFs are associated with large amplitude changes in $B_z$. DFs constitute a quarter of these large-amplitude events, while the rest are associated with more complicated magnetic field structures. We conclude that the ``classical" picture of DFs at the JFs is not the most common situation.
