{
  "id": "1511.01328",
  "version": "v1",
  "published": "2015-11-04T13:43:53.000Z",
  "updated": "2015-11-04T13:43:53.000Z",
  "title": "Multi-thermal representation of the kappa-distribution of solar flare electrons and application to simultaneous X-ray and EUV observations",
  "authors": [
    "Marina Battaglia",
    "Galina Motorina",
    "Eduard P. Kontar"
  ],
  "comment": "24 pages, 7 figures, ApJ, accepted",
  "categories": [
    "astro-ph.SR"
  ],
  "abstract": "Acceleration of particles and plasma heating is one of the fundamental problems in solar flare physics. An accurate determination of the spectrum of flare energized electrons over a broad energy range is crucial for our understanding of aspects such as the acceleration mechanism and the total flare energy. Recent years have seen a growing interest in the kappa-distribution as representation of the total spectrum of flare accelerated electrons. In this work we present the kappa-distribution as a differential emission measure. This allows for inferring the electron distribution from X-ray observations and EUV observations by simultaneously fitting the proposed function to RHESSI and SDO/AIA data. This yields the spatially integrated electron spectra of a coronal source between less than 0.1 keV up to several tens of keV. The method is applied to a single-loop GOES C4.1 flare. The results show that the total energy can only be determined accurately by combining RHESSI and AIA observations. Simultaneously fitting the proposed representation of the kappa-distribution reduces the electron number density in the analyzed flare by a factor of ~30 and the total flare energy by a factor of ~5 compared with the commonly used fitting of RHESSI spectra. The spatially integrated electron spectrum of the investigated flare between 0.043 keV and 24 keV is consistent with the combination of a low-temperature (~2 MK) component and a hot (~11 MK) kappa-like component with spectral index 4, reminiscent of solar wind distributions.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2015-11-04T13:43:53.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "solar flare electrons",
      "euv observations",
      "multi-thermal representation",
      "simultaneous x-ray",
      "kappa-distribution"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 24,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}