{
  "annotation_id": "2ef23d34-6fb1-46f7-a175-16cd9d82b656",
  "date_created": "2026-03-02T18:00:53.463000Z",
  "date_modified": "2026-03-02T18:00:53.463000Z",
  "file_hash": "6eec8591f6bad576815a58453e534a4e23c29310fa98e379c1ef95c88e2f4193",
  "private": false,
  "record": {
    "abstract": "Using a mean-field dynamo model with a spherically symmetric helical\nturbulence parameter alpha which is dynamically quenched and disturbed by\nadditional noise, the basic features of geomagnetic polarity reversals are\nshown to be generic consequences of the dynamo action in the vicinity of\nexceptional points of the spectrum. This simple paradigmatic model yields long\nperiods of constant polarity which are interrupted by self-accelerating field\ndecays leading to asymmetric polarity reversals. It shows the recently\ndiscovered bimodal field distribution, and it gives a natural explanation of\nthe correlation between polarity persistence time and field strength. In\naddition, we find typical features of coherence resonance in the dependence of\nthe persistence time on the noise.",
    "arxiv_id": "physics/0411050",
    "authors": [
      "Frank Stefani",
      "Gunter Gerbeth"
    ],
    "categories": [
      "physics.geo-ph",
      "astro-ph",
      "physics.flu-dyn"
    ],
    "doi": "10.1103/PhysRevLett.94.184506",
    "journal_ref": "Phys.Rev.Lett. 94 (2005) 184506",
    "title": "Asymmetric polarity reversals, bimodal field distribution, and coherence   resonance in a spherically symmetric mean-field dynamo model",
    "url": "https://arxiv.org/abs/physics/0411050"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "f1d6877c-8d62-45c5-84aa-da436e4e6e64",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}