Kinetic models of solar wind current sheet

Current sheets in the collisionless solar wind usually have kinetic spatial scales. In-situ measurements show that these current sheets are often approximately force-free, i.e. the directionsof their current density and magnetic field are aligned, despite the fact that the plasma betais found to be of the order of one. The measurements also often show systematic asymmetric spatial variations of the plasma density and temperature across the current sheets, whilstthe plasma pressure is approximately uniform. Neukirch et al. (2020) found exact equilibriummodels of force-free collisionless current sheets which allowed for asymmetric plasma densityand temperature gradients. These models assumed that the form of the distribution function forelectrons and ions is the same. In this contribution we generalise this approach to current sheetswith static ions. As a consequence the force-free condition is only satisfied approximately andquasi-neutrality requires the presence of a nonvanishing electric potential