Preface to special topic: Plasma physics of the Sun in honor of Eugene Parker

This Special Topic commemorates the legacy of Eugene Parker and highlights new understandings of the plasma physics of the Sun resulting from the observations, plans, and analyses for the Parker Solar Probe (PSP) and Solar Orbiter (SolO) Missions. In recognition of Eugene Parker's remarkable insights and many contributions, distinguished authors from around the world were invited to present papers in theoretical, computational, and observational heliophysics and astrophysics. A total of 80 authors from 12 countries (Argentina, Czech Republic, France, Germany, Greece, India, Italy, New Zealand, People's Republic of China, Spain, United Kingdom, and United States of America) contributed to the Special Collection. These papers bring the recent research in physics of the Sun to the broader plasma physics community. Many include the latest observations from PSP and SolO and describe new understandings of coronal processes, solar wind structure and dynamics, transient events including nanoflares, and insights into stellar equilibrium and flows.