{
  "annotation_id": "0c540ac9-9972-4e4c-8e90-4f783ac09124",
  "date_created": "2026-03-02T18:00:52.605000Z",
  "date_modified": "2026-03-02T18:00:52.605000Z",
  "file_hash": "9b1f2373e3e2a16d6c2a71099163c2964f29dde498c71d91af7c7fda0b06e095",
  "private": false,
  "record": {
    "abstract": "We detected phase jumps of the Free Core Nutation (FCN) of the Earth directly\nfrom the analysis of the Very Long Baseline Interferometer (VLBI) observation\nof the Earth rotation for the period 1984-2003 by applying the Weighted Wavelet\nZ-Transform (WWZ) method and the Short-time Periodogram with the Gabor function\n(SPG) method. During the period, the FCN had two significant phase jumps in\n1992 and 1998. These epochs coincide with the reported occurrence of\ngeomagnetic jerks.",
    "arxiv_id": "physics/0408026",
    "authors": [
      "Toshimichi Shirai",
      "Toshio Fukushima",
      "Zinovy Malkin"
    ],
    "categories": [
      "physics.geo-ph"
    ],
    "doi": "10.1186/BF03352559",
    "journal_ref": "Earth Planets Space, 2005, v. 57, No. 2, 151-155.",
    "title": "Detection of Phase Jumps of Free Core Nutation of the Earth and their   Concurrence with Geomagnetic Jerks",
    "url": "https://arxiv.org/abs/physics/0408026"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "2301913e-b246-476a-a4de-eacbad44c10b",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}