The Sun's corona is the outermost part of the Sun's atmosphere. And he stream of energized, charged particles, primarily electrons, and protons, flowing outward...
Scientists reported abundance data for hydrogen in four solar wind regimes collected by the Genesis mission (bulk solar wind, inter stream low‐energy wind, coronal hole high‐energy wind, and coronal mass ejections).
Solar Orbiter will address big questions in Solar System science to help us understand how our star creates and controls the giant bubble of plasma that surrounds the whole Solar System and influences the planets within it. It is an ESA mission with strong NASA participation.