{
  "id": "1807.00020",
  "version": "v1",
  "published": "2018-06-29T18:08:42.000Z",
  "updated": "2018-06-29T18:08:42.000Z",
  "title": "Sequential eruptions triggered by flux emergence - observations and modeling",
  "authors": [
    "Sally Dacie",
    "Tibor Torok",
    "Pascal Demoulin",
    "Mark Linton",
    "Cooper Downs",
    "Lidia van Driel-Gesztelyi",
    "David Long",
    "James Leake"
  ],
  "comment": "17 pages, 8 figures, accepted for publication by the Astrophysical Journal",
  "categories": [
    "astro-ph.SR"
  ],
  "abstract": "We describe and analyze observations by the Solar Dynamics Observatory of the emergence of a small, bipolar active region within an area of unipolar magnetic flux that was surrounded by a circular, quiescent filament. Within only eight hours of the start of the emergence, a partial splitting of the filament and two consecutive coronal mass ejections took place. We argue that all three dynamic events occurred as a result of particular magnetic-reconnection episodes between the emerging bipole and the pre-existing coronal magnetic field. In order to substantiate our interpretation, we consider three-dimensional magnetohydrodynamic simulations that model the emergence of magnetic flux in the vicinity of a large-scale coronal flux rope. The simulations qualitatively reproduce most of the reconnection episodes suggested by the observations; as well as the filament-splitting, the first eruption, and the formation of sheared/twisted fields that may have played a role in the second eruption. Our results suggest that the position of emerging flux with respect to the background magnetic configuration is a crucial factor for the resulting evolution, while previous results suggest that parameters such as the orientation or the amount of emerging flux are important as well. This poses a challenge for predicting the onset of eruptions that are triggered by flux emergence, and it calls for a detailed survey of the relevant parameter space by means of numerical simulations.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2018-06-29T18:08:42.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "flux emergence",
      "sequential eruptions",
      "observations",
      "coronal mass ejections took place",
      "magnetic flux"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 17,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}