Multi-Spacecraft Observation of a Quasi-Stationary Tail Current Sheet

We investigate Earth's magnetotail current sheet under quiet magnetospheric conditions using Cluster satellites' observations. In contrast to the most of previous studies, where the 10 min current sheets crossings related to flapping were investigated, we consider events with duration of 30–45 min where the satellites' motion is a significant in relation to the flapping motion. Current sheet in this case study is embedded with thickness of 1.5–2 $R_E$ or 40–100 proton gyroradii, maximum current density is 3–4 nA/m². The electric current calculated using curlometer method has similar value to the sum of the three contributions to the current calculated by plasma parameters (proton diamagnetic current, electron diamagnetic current, anisotropic electron current). Near the current sheet's center anisotropic electrons and diamagnetic $\partial P/\partial x$ part provide the main contribution to the total current. While ion diamagnetic $\partial P/\partial z$ part is responsible for the current far from the center.