Fig. 2: Overview of the KAW-proton interaction event on December 30, 2015.
From: Particle-sounding of the spatial structure of kinetic Alfvén waves

a The looking direction-averaged phase space densities of protons as a function of time and energy. b An expanded view of panel a, in which KAW-associated oscillations can be noted. c The line-version of panel b. d The magnetic and electric fields of the KAWs in the field-aligned coordinates.