{
  "annotation_id": "70577b7d-aa92-4def-b301-69f12056793c",
  "date_created": "2026-03-02T18:00:56.162000Z",
  "date_modified": "2026-03-02T18:00:56.162000Z",
  "file_hash": "de74327e7a902ea0d372210fa8b52ab813bc17e125b607d5f11777d146722a44",
  "private": false,
  "record": {
    "abstract": "Hammer et al. [1997] report the presence of regularly spaced acidity peaks\n(H+, F-, Cl-) in the Byrd Station, Antarctica ice core. The event has a\nduration of about one century and falls at the beginning of the deglacial\nwarming. Volcanism appears to be an unlikely cause since the total acid\ndeposition of this event was about 18 fold greater than the largest known\nvolcanic eruption, and since volcanic eruptions are not known to recur with\nsuch regularity. We show that the recurrence period of these peaks averages to\n11.5 +/- 2.4 years, which approximates the solar cycle period, and suggest that\nthis feature may have an extraterrestrial origin. We propose that this material\nmay mark a period of enhanced interstellar dust and gas influx modulated by the\nsolar cycle. The presence of this material could have made the Sun more active\nand have been responsible for initiating the warming that ended the last ice\nage.",
    "arxiv_id": "physics/0502019",
    "authors": [
      "Paul LaViolette"
    ],
    "categories": [
      "physics.gen-ph",
      "physics.space-ph"
    ],
    "doi": "10.1016/j.pss.2004.09.020",
    "journal_ref": "Planetary and Space Science, 2005, vol. 53 no. 4, pages 385 - 393",
    "title": "Solar Cycle Variations in Ice Acidity at the End of the Last Ice Age:   Possible Marker of a Climatically Significant Interstellar Dust Incursion",
    "url": "https://arxiv.org/abs/physics/0502019"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "fb4d44c2-36e7-41a0-8aae-1f89cc8d390f",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}