- Swedish Institute of Space Physics, Uppsala, Sweden (1390109457@qq.com)
Short large-amplitude magnetic structures (SLAMS) are seen as critical elements in collisionless shocks with quasi-parallel geometries. They can pre-accelerate solar wind ions into suprathermal energy as an injection mechanism for Diffusive Shock Acceleration. To understand the details of the injection problem, we present direct observations of nonstationarity of a SLAMS, using Magnetosperic Multiscale (MMS) measurement in a sting-of-pearls configuration separated by several hundreds of kilometers. We find that the upstream edge of the SLAMS serves as a local quasi-perpendicular shock front to reflect and accelerate solar wind ions. Accumulation of reflected ions results in upstream expansion of the SLAMS ramp and the reflecting point may change their location. Whistlers grow quickly as the SLAMS ramp propagates towards upstream and distort the SLAMS in return.
How to cite: Wang, M., Khotyaintsev, Y., and Graham, D.: Multipoint Observations of Nonstationarity of a Short Large-Amplitude Magnetic Structure (SLAMS), EGU General Assembly 2025, Vienna, Austria, 27 Apr–2 May 2025, EGU25-11679, https://doi.org/10.5194/egusphere-egu25-11679, 2025.