{"paper":{"title":"A Parallel-Propagating Alfv\\'enic Ion-Beam Instability in the High-Beta Solar Wind","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.SR","physics.plasm-ph"],"primary_cat":"physics.space-ph","authors_text":"Benjamin D. G. Chandran, Bennett A. Maruca, Daniel Verscharen, Sofiane Bourouaine","submitted_at":"2013-06-11T14:08:35Z","abstract_excerpt":"We investigate the conditions under which parallel-propagating Alfv\\'en/ion-cyclotron waves are driven unstable by an isotropic ($T_{\\perp \\alpha} = T_{\\parallel\\alpha}$) population of alpha particles drifting parallel to the magnetic field at an average speed $U_{\\alpha}$ with respect to the protons. We derive an approximate analytic condition for the minimum value of $U_{\\alpha}$ needed to excite this instability and refine this result using numerical solutions to the hot-plasma dispersion relation. When the alpha-particle number density is $\\simeq 5%$ of the proton number density and the tw"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1306.2531","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"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"}