Reconstructing the Sun’s Alfv\’en surface and wind braking torque with Parker Solar Probe

[2509.07088] Reconstructing the Sun’s Alfvén surface and wind braking torque with Parker Solar Probe Skip to main content We gratefully acknowledge support from the Simons Foundation, member institutions , and all contributors.
The size of the Alfvén surface governs how efficiently the solar wind braking torque causes the Sun to spin-down.
The Alfvén surface was extrapolated from the solar wind mass and magnetic flux measured by the SWEAP and FIELDS instrument suites onboard PSP.
We accounted for the acceleration of the solar wind along Parker spiral magnetic field lines and used potential field source surface modelling to determine the sources of the solar wind.
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