{"paper":{"title":"Energetics and Emission in a Simulated Solar Flare Initialised by a Non-Force Free Magnetic Field","license":"http://creativecommons.org/licenses/by/4.0/","headline":"Non-force-free initial fields let flare simulations release twice the magnetic energy and match observed EUV emission more closely than standard force-free setups.","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"A. Prasad, A. Roddanavar, A. S. Brun, A. Strugarek, K. Matsumoto, M. Gordovskyy, M. V. Sieyra, P. Browning, S. Inoue, W. Bate","submitted_at":"2026-03-04T19:39:56Z","abstract_excerpt":"Solar flare simulations are commonly initialised using non-linear force free field (NLFF) extrapolations derived from photospheric vector magnetograms. However, the force free assumption neglects plasma forces and may limit the available free magnetic energy. In this work, we perform a controlled comparison of two three-dimensional resistive magnetohydrodynamic simulations of the X2.1-class flare that occurred on 2011 September 06 in NOAA Active Region 11283. The simulations differ only in their initial magnetic configuration: one is based on a conventional NLFF extrapolation, while the other "},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"the non-force free model undergoes more extensive magnetic restructuring and releases approximately twice as much magnetic energy (≈4.4 × 10^31 erg) as the NLFF case (≈2.3 × 10^31 erg), bringing the energy budget into closer agreement with expectations for X-class flares. The non-force free model produces a brighter and more spatially extended emission structure that more closely resembles the observed flare morphology and light curve.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"That the only meaningful difference between the two runs is the initial magnetic configuration and that the non-force-free extrapolation accurately captures the real pre-flare coronal field without introducing uncontrolled numerical or physical artifacts.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"Non-force-free initial magnetic fields in solar flare simulations release about twice the magnetic energy and yield EUV emission closer to observations than conventional NLFF extrapolations.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"Non-force-free initial fields let flare simulations release twice the magnetic energy and match observed EUV emission more closely than standard force-free setups.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"3f4f39aa09c288ac4a96d6dbf324dde16b02013aa31476019253e3c79833f670"},"source":{"id":"2603.04557","kind":"arxiv","version":2},"verdict":{"id":"42d3380b-ccd6-4e9f-8ae0-661e5ef386af","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-15T15:54:51.397102Z","strongest_claim":"the non-force free model undergoes more extensive magnetic restructuring and releases approximately twice as much magnetic energy (≈4.4 × 10^31 erg) as the NLFF case (≈2.3 × 10^31 erg), bringing the energy budget into closer agreement with expectations for X-class flares. The non-force free model produces a brighter and more spatially extended emission structure that more closely resembles the observed flare morphology and light curve.","one_line_summary":"Non-force-free initial magnetic fields in solar flare simulations release about twice the magnetic energy and yield EUV emission closer to observations than conventional NLFF extrapolations.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"That the only meaningful difference between the two runs is the initial magnetic configuration and that the non-force-free extrapolation accurately captures the real pre-flare coronal field without introducing uncontrolled numerical or physical artifacts.","pith_extraction_headline":"Non-force-free initial fields let flare simulations release twice the magnetic energy and match observed EUV emission more closely than standard force-free setups."},"references":{"count":35,"sample":[{"doi":"10.1006/jcph.2001.6780","year":2001,"title":"Arber, T. D., Longbottom, A. W., Gerrard, C. L., & Milne, A. M. 2001, Journal of Computational Physics, 171, 151, doi: 10.1006/jcph.2001.6780","work_id":"c62171ed-0aa9-40a4-8d32-0d3526b2b24b","ref_index":1,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"10.3847/1538-4357/ad55ca","year":2024,"title":"Aslanyan, V., Scott, R. B., Wilkins, C. P., et al. 2024, ApJ, 971, 137, doi: 10.3847/1538-4357/ad55ca","work_id":"dcf6a2f9-5cb1-44ee-9dbb-2f0a898ceea9","ref_index":2,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"10.1007/s11207-014-0529-3","year":2014,"title":"Bobra, M. G., Sun, X., Hoeksema, J. T., et al. 2014, SoPh, 289, 3549, doi: 10.1007/s11207-014-0529-3 Bárta, M., Büchner, J., Karlický, M., & Kotrč, P. 2011, ApJ, 730, 47, doi: 10.1088/0004-637X/730/1/","work_id":"e34d1fba-b5fb-4568-a270-39d620b0cde8","ref_index":3,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"10.3847/1538-4357/ab4f7a","year":2020,"title":"year = 2020, month = feb, volume =","work_id":"309592e5-6321-42fc-a4c1-3eb8fbcc5639","ref_index":4,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"10.1006/jcph.2001.6961","year":2002,"title":"2002, Journal of Computational Physics, 175, 645, doi: 10.1006/jcph.2001.6961","work_id":"4b0557bd-3a02-4d21-82fd-43f8e192e2ec","ref_index":5,"cited_arxiv_id":"","is_internal_anchor":false}],"resolved_work":35,"snapshot_sha256":"7089d6e9850c810d91dcd0379a709693cbabbfe4bcb45bdfb438266977f75945","internal_anchors":0},"formal_canon":{"evidence_count":2,"snapshot_sha256":"44caad90b02bfaf3c5e688edc7e4a5c3835fc3578df7c670335e43b418a44498"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}