PSP Solar Wind Sources at 13.3 Solar Radii

Authors: Samuel Badman (UCB/SSL), Robert Allen (APL), C. Nick Arge (GSFC), Stuart D. Bale (UCB/SSL), Carl J. Henney (AFRL), Shaela I. Jones (GSFC), Justin C. Kasper (BWXT), Tae Kim (UAH), Parisa Mostafavi (APL), Nick Pogorelov (UAH), Nour Raouafi (APL), Pete Riley (PSI), David Stansby (UCL), Jaye L. Verniero (GSFC)

Parker Solar Probe (PSP) is now in an orbit of perihelion distance 13.3 solar radii, a record breaking approach, and orbiting so fast with respect to the corona that PSP covers over 110 degrees in heliographic longitude in just a few days. This mission profile allows unprecedented probing of solar wind source regions and stream boundaries by taking a near instantaneous cut through a large swathe of the corona. In this presentation we give an overview of the sources and spatial structures observed by this new family of orbits. Of particular interest is the first (Encounter 10 from November 2021) in which direct correspondence between in situ solar wind velocity, source mapping and magnetic field line expansion factor is observed, punctuated by dips into sub-alfvenic wind while crossing from source to source.