{"paper":{"title":"Observation of a New Type of Low Frequency Waves at Comet 67P/Churyumov-Gerasimenko","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"physics.space-ph","authors_text":"A. Eriksson, B. Stoll, B. T. Tsurutani, C. Carr, C. Goetz, C.Koenders, C. Perschke, C. Vallat, D. Fruehauff, E. Cupido, H. Nilsson, H.-U. Auster, I. Richter, J. Burch, J.-P. Lebreton, K. Altwegg, K.-H. Glassmeier, K. Szegoe, M. Rubin, M. Volwerk, P. Heinisch, P. Henri, P. Mokashi, R. Goldstein, U. Motschmann, Z. Nemeth","submitted_at":"2015-05-22T13:31:36Z","abstract_excerpt":"We report on magnetic field measurements made in the innermost coma of 67P/Churyumov-Gerasimenko in its low activity state. Quasi-coherent, large-amplitude ($\\delta B/B \\sim 1$), compressional magnetic field oscillations at $\\sim$ 40 mHz dominate the immediate plasma environment of the nucleus. This differs from previously studied comet-interaction regions where waves at the cometary ion gyro-frequencies are the main feature. Thus classical pick-up ion driven instabilities are unable to explain the observations. We propose a cross-field current instability associated with newborn cometary ion "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1505.06068","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"}