{
  "id": "1506.08336",
  "version": "v1",
  "published": "2015-06-27T23:13:50.000Z",
  "updated": "2015-06-27T23:13:50.000Z",
  "title": "UV spectra, bombs, and the solar atmosphere",
  "authors": [
    "Philip G. Judge"
  ],
  "comment": "Accepted for publication in the Astrophysical journal",
  "categories": [
    "astro-ph.SR"
  ],
  "abstract": "A recent analysis of UV data from the Interface Region Imaging Spectrograph {\\em IRIS} reports plasma \"bombs\" with temperatures near \\hot{} within the solar photosphere. This is a curious result, firstly because most bomb plasma pressures $p$ (the largest reported case exceeds $10^3$ dyn~cm$^{-2}$) fall well below photospheric pressures ($> 7\\times10^3$), and secondly, UV radiation cannot easily escape from the photosphere. In the present paper the {\\em IRIS} data is independently analyzed. I find that the bombs arise from plasma originally at pressures between $\\lta80$ and 800 dyne~cm$^{-2}$ before explosion, i.e. between $\\lta850$ and 550 km above $\\tau_{500}=1$. This places the phenomenon's origin in the low-mid chromosphere or above. I suggest that bomb spectra are more compatible with Alfv\\'enic turbulence than with bi-directional reconnection jets.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2015-06-27T23:13:50.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "solar atmosphere",
      "uv spectra",
      "largest reported case exceeds",
      "bomb plasma pressures",
      "bi-directional reconnection jets"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}