{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"de50cdcfbf942da405eb22da449fbac8fbc59e555e22ddf53b23e6cb39bce6b3","created":"2026-10-03T07:17:55Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"a0defc78409ab081bfb3c4a00948be3c3201496a4075107bdce6aeb7ddd30587","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"mechanism","assisted_by":[],"external_id":"astro.solar-corona-wind.fast-wind-energy","kind":"phenomenon","literature_status":"open","n":"1","parents":[],"plain":"The fast solar wind leaves the Sun at about $7.5e7\\,\\mathrm{cm/s}$, and it is not settled whether waves in the magnetic field or bursts of magnetic reconnection push it to that speed.","posed_since":"","precise":"Determine whether Alfven-wave turbulence, interchange reconnection at the base of coronal holes, or both supply the energy and momentum flux of the fast wind (speed $\\sim 7e7\\ \\text{to}\\ 8e7\\,\\mathrm{cm}/\\mathrm{s}$), including the heating of protons and heavy ions above the electron temperature. Answer: the fraction of the energy flux supplied by each process, consistent with Parker Solar Probe and Solar Orbiter data inside and near the Alfven surface.","problem_ref":null,"references":"","settled_by":"Parker Solar Probe and Solar Orbiter measurements of wave energy flux and reconnection signatures inside the Alfven surface, connected to remote-sensed coronal-hole source regions, that close the energy budget.","status_note":"2021: Parker Solar Probe first crossed into sub-Alfvenic wind; since December 2024 it reaches 9.86 solar radii from the Sun's center.","title":"What supplies the energy and momentum of the fast solar 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