{
  "annotation_id": "35dc156b-c6d0-49a2-852f-4b316fcc4f36",
  "date_created": "2026-03-02T18:01:17.629000Z",
  "date_modified": "2026-03-02T18:01:17.629000Z",
  "file_hash": "ff96bf2e0e3d3e254b81c81497c1cdb477eebe009a802ba2a95b3d082a4cc9c2",
  "private": false,
  "record": {
    "abstract": "The nature of current sheet formation in the vicinity of three-dimensional\n(3D) magnetic null points is investigated. The particular focus is upon the\neffect of the compressibility of the plasma on the qualitative and quantitative\nproperties of the current sheet. An initially potential 3D null is subjected to\nshearing perturbations, as in a previous paper [Pontin et al., Phys. Plasmas,\nin press (2007)]. It is found that as the incompressible limit is approached,\nthe collapse of the null point is suppressed, and an approximately planar\ncurrent sheet aligned to the fan plane is present instead. This is the case\nregardless of whether the spine or fan of the null is sheared. Both the peak\ncurrent and peak reconnection rate are reduced. The results have a bearing on\nprevious analytical solutions for steady-state reconnection in incompressible\nplasmas, implying that fan current sheet solutions are dynamically accessible,\nwhile spine current sheet solutions are not.",
    "arxiv_id": "physics/0701197",
    "authors": [
      "D. I. Pontin",
      "A. Bhattacharjee",
      "K. Galsgaard"
    ],
    "categories": [
      "physics.plasm-ph",
      "astro-ph",
      "physics.space-ph"
    ],
    "doi": "10.1063/1.2734949",
    "title": "Current sheets at three-dimensional magnetic nulls: Effect of   compressibility",
    "url": "https://arxiv.org/abs/physics/0701197"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "e3063ace-97c4-4587-91f6-24462c336c04",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}