{"paper":{"title":"Chromospheric dynamics and turbulence regulate the solar FIP effect","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"Chromospheric turbulence and acoustic flux regulate solar elemental fractionation via the ponderomotive force.","cross_cats":["physics.space-ph"],"primary_cat":"astro-ph.SR","authors_text":"Adam J. Finley, Andy S.H. To, Jeffrey Reep, J. Martin Laming","submitted_at":"2026-04-14T18:00:24Z","abstract_excerpt":"Elemental abundance variations in the solar corona, commonly characterised by First Ionisation Potential (FIP) bias, provide crucial diagnostics of chromospheric processes. The ponderomotive force model, which attributes fractionation to Alfv\\'en wave propagation, has successfully reproduced the observed fractionation patterns in various solar features. However, existing theoretical implementations rely on a static quiet Sun chromosphere, leaving the influence of chromospheric dynamics largely unexplored. We address this limitation by combining hydrodynamic simulations from HYDRAD with pondero"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"when acoustic wave flux drops below ∼5×10^6 erg cm^{-2} s^{-1}, mass-dependent thermal velocities dominate the fractionation process, producing counterintuitive patterns where Fe exceeds Ca in FIP bias, while high-FIP Ar shows fractionation. We demonstrate that any source of chromospheric turbulence will act to suppress fractionation.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"The assumption that the specific nanoflare-like impulsive heating events in the HYDRAD simulations and the chosen acoustic flux values accurately represent real chromospheric dynamics, and that the ponderomotive force calculations in FIPpy capture all relevant fractionation physics without additional unmodeled effects.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"Chromospheric dynamics and turbulence regulate the solar FIP effect, with acoustic flux below ~5e6 erg cm^-2 s^-1 causing mass-dependent fractionation patterns and turbulence suppressing bias.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"Chromospheric turbulence and acoustic flux regulate solar elemental fractionation via the ponderomotive force.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"e8b536ef954e42b649f0b332f731ef34048d2293cd29cb72f2e7c20ec07a1ddd"},"source":{"id":"2604.13174","kind":"arxiv","version":2},"verdict":{"id":"912e5eeb-e1f1-4360-a030-4b8af62a9689","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-10T13:44:48.874249Z","strongest_claim":"when acoustic wave flux drops below ∼5×10^6 erg cm^{-2} s^{-1}, mass-dependent thermal velocities dominate the fractionation process, producing counterintuitive patterns where Fe exceeds Ca in FIP bias, while high-FIP Ar shows fractionation. We demonstrate that any source of chromospheric turbulence will act to suppress fractionation.","one_line_summary":"Chromospheric dynamics and turbulence regulate the solar FIP effect, with acoustic flux below ~5e6 erg cm^-2 s^-1 causing mass-dependent fractionation patterns and turbulence suppressing bias.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"The assumption that the specific nanoflare-like impulsive heating events in the HYDRAD simulations and the chosen acoustic flux values accurately represent real chromospheric dynamics, and that the ponderomotive force calculations in FIPpy capture all relevant fractionation physics without additional unmodeled effects.","pith_extraction_headline":"Chromospheric turbulence and acoustic flux regulate solar elemental fractionation via the ponderomotive force."},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2604.13174/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}