{
  "id": "0910.0751",
  "version": "v1",
  "published": "2009-10-05T12:38:58.000Z",
  "updated": "2009-10-05T12:38:58.000Z",
  "title": "Plasma heating in the very early phase of solar flares",
  "authors": [
    "M. Siarkowski",
    "R. Falewicz",
    "P. Rudawy"
  ],
  "comment": "Comments: 17 pages, 5 figures, The Astrophysical Journal Letters (accepted, October 2009)",
  "journal": "The Astrophysical Journal, 705:L143-L147, 2009 November 10",
  "doi": "10.1088/0004-637X/705/2/L143",
  "categories": [
    "astro-ph.SR"
  ],
  "abstract": "In this paper we analyze soft and hard X-ray emission of the 2002 September 20 M1.8 GOES class solar flare observed by RHESSI and GOES satellites. In this flare event, soft X-ray emission precedes the onset of the main bulk hard X-ray emission by ~5 min. This suggests that an additional heating mechanism may be at work at the early beginning of the flare. However RHESSI spectra indicate presence of the non-thermal electrons also before impulsive phase. So, we assumed that a dominant energy transport mechanism during rise phase of solar flares is electron beam-driven evaporation. We used non-thermal electron beams derived from RHESSI spectra as the heating source in a hydrodynamic model of the analyzed flare. We showed that energy delivered by non-thermal electron beams is sufficient to heat the flare loop to temperatures in which it emits soft X-ray closely following the GOES 1-8 A light-curve. We also analyze the number of non-thermal electrons, the low energy cut-off, electron spectral indices and the changes of these parameters with time.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2009-10-05T12:38:58.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "solar flare",
      "early phase",
      "plasma heating",
      "non-thermal electron beams",
      "main bulk hard x-ray emission"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "journal": "The Astrophysical Journal",
      "year": 2009,
      "month": "Nov",
      "volume": 705,
      "number": 2
    },
    "note": {
      "typesetting": "TeX",
      "pages": 17,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 833000,
      "adsabs": "2009ApJ...705L.143S"
    }
  }
}