Are Dipolarization Fronts a Typical Feature of Magnetotail Plasma Jets Fronts?

Abstract

AbstractPlasma jets are ubiquitous in the Earth's magnetotail. Plasma jet fronts (JFs) are a seat of particle acceleration and energy conversion. JFs are commonly associated with dipolarization fronts (DFs), which are often characterized by solitary sharp large‐amplitude increases in the northward component of the magnetic field Bz. However, MHD and kinetic instabilities can develop at JFs and disturb the front structure which questions on the occurrence of solitary DFs at the JFs. We investigate the structure of JFs using 5 years (2017–2021) of the Magnetospheric Multiscale observations in the central plasma sheet (CPS) in the Earth's magnetotail. We compiled a database of 2394 CPS jets. We find that 42% of the JFs are associated with large‐amplitude changes in Bz. However, solitary DFs constitute a quarter of these large‐amplitude events, while the rest are associated with more complex structures.