Authors: Hasith Perera (Department of Physics and Astronomy, Clemson University), Paul Cassak (Clemson University), Michael Shay (University of Delaware)

Landau damping is a well-studied mechanism of plasma heating in the solar wind. Recent observational studies have identified signatures of Landau damping using the field-particle correlation (FPC) technique (Chen et al., Nat. Commun., 10, 740, 2019). In a Langmuir wave, the electric field accelerates the electrons collectively such that resonant electrons gain energy from the electric field, heating the plasma and reducing the wave amplitude. In this study, we use kinetic entropy techniques (Cassak et al., PRL, 130, 085201, 2023) to examine the position-dependent signatures of the electron distribution function to understand the localized energy exchange. Relative entropy is used as a diagnostic for identifying localized signatures of electron resonance. We use a 1D-1V Vlasov simulation using Gkeyll of a traveling electrostatic Langmuir wave to study the spatial changes in the distribution function and identify particle motion producing these signatures.