{
  "id": "1712.06829",
  "version": "v1",
  "published": "2017-12-19T09:09:35.000Z",
  "updated": "2017-12-19T09:09:35.000Z",
  "title": "Inference of chromospheric magnetic fields in a sunspot derived from spectropolarimetry of Ca II 8542 A",
  "authors": [
    "Ali G. A. Abdelkawy",
    "Abdelrazek M. K. Shaltout",
    "M. M. Beheary",
    "T. A. Schad"
  ],
  "comment": "12 pages, 6 figures",
  "categories": [
    "astro-ph.SR",
    "physics.space-ph"
  ],
  "abstract": "We analyze spectropolarimetric observations of the chromospheric Ca II 8542 A line taken by the Interferometric Bidimensional Spectrometer (IBIS) at the Dunn Solar Telescope. The data were observed on 2012 January 29 for the NOAA active region 11408. Adopting the center-of-gravity (COG) approach we obtain the line-of-sight (LOS) field strength for the chromospheric IBIS data of Ca II 8542 A line. The LOS strength of the magnetic field is determined in the target active region inside a field of view 45 x 95 arcsec. The LOS field values were found to be increase up to 800 G inside the umbral region and decrease systematically toward the edges of a sunspot. Under the weak field approximation (WFA), the horizontal, vertical magnetic field components and azimuthal field vector are obtained.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2017-12-19T09:09:35.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "chromospheric magnetic fields",
      "spectropolarimetry",
      "weak field approximation",
      "analyze spectropolarimetric observations",
      "interferometric bidimensional spectrometer"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 12,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}