{
  "id": "1407.7838",
  "version": "v1",
  "published": "2014-07-29T19:37:11.000Z",
  "updated": "2014-07-29T19:37:11.000Z",
  "title": "Variations in Abundance Enhancements in Impulsive Solar Energetic-Particle Events and Related CMEs and Flares",
  "authors": [
    "Donald V. Reames",
    "Edward W. Cliver",
    "Stephen W. Kahler"
  ],
  "comment": "21 pages, 12 figures, Accepted for publication for Solar Physics",
  "categories": [
    "astro-ph.SR"
  ],
  "abstract": "We study event-to-event variations in the abundance enhancements of the elements He through Pb for Fe-rich impulsive solar energetic-particle (SEP) events, and their relationship with properties of associated coronal mass ejections (CMEs) and solar flares. Using a least-squares procedure we fit the power-law enhancement of element abundances as a function of their mass-to-charge ratio A/Q to determine both the power and the coronal temperature (which determines Q) in each of 111 impulsive SEP events identified previously. Individual SEP events with the steepest element enhancements, e.g. ~(A/Q)^6, tend to be smaller, lower-fluence events with steeper energy spectra that are associated with B- and C-class X-ray flares, with cooler (~2.5 MK) coronal plasma, and with narrow (<100 deg), slower (<700 km/s) CMEs. On the other hand, higher-fluence SEP events have flatter energy spectra, less-dramatic heavy-element enhancements, e.g. ~(A/Q)^3, and come from somewhat hotter coronal plasma (~3.2 MK) associated with C-, M- and even X-class X-ray flares and with wider CMEs. Enhancements in 3He/4He are uncorrelated with those in heavy elements. However, events with 3He/4He > 0.1 are even more strongly associated with narrow, slow CMEs, with cooler coronal plasma, and with B- and C-class X-ray flares than are other Fe-rich impulsive SEP events with smaller enhancements of 3He.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2014-07-29T19:37:11.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "impulsive solar energetic-particle events",
      "abundance enhancements",
      "related cmes",
      "c-class x-ray flares",
      "variations"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1007/s11207-014-0589-4",
      "journal": "Solar Physics",
      "year": 2014,
      "month": "Dec",
      "volume": 289,
      "number": 12,
      "pages": 4675
    },
    "note": {
      "typesetting": "TeX",
      "pages": 21,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2014SoPh..289.4675R"
    }
  }
}