Authors: Samuel Fordin (NASA GSFC, Greenbelt, MD), Jaye Verniero (NASA GSFC, Greenbelt, MD), Adam Szabo (NASA GSFC, Greenbelt, MD), Yeimy Rivera (Harvard-Smithsonian Center for Astrophysics, Cambridge, USA), Samuel Badman (Harvard-Smithsonian Center for Astrophysics, Cambridge, USA)

Parker Solar Probe (PSP) is providing unprecedented measurements of the inner heliosphere to understand how the solar wind is accelerated and heated. PSP has shown that the heliospheric current sheet (HCS) is a site of ongoing reconnection, which is linked with proton beams and associated ion-scale wave­s. Recent encounters include conjunctions between PSP, Solar Orbiter, and the Wind spacecraft at L1, enabling the study of solar wind structure in and around the HCS as it propagates outward to near Earth. We will assess the extent to which kinetic-scale dynamics in the near-Sun environment persist and/or evolve in the near-Earth environment. For example, in Encounter 22, ion-scale waves associated with the HCS are observed by PSP, Wind, and Solar Orbiter. We compare and contrast the properties of these waves, including occurrence rates, distance from the current sheet, coherency, and polarization. We hypothesize the role that these waves play in solar wind energization and on their interplay with structurally-complex regions ­­near the HCS.