{
  "id": "1206.4360",
  "version": "v1",
  "published": "2012-06-19T23:20:31.000Z",
  "updated": "2012-06-19T23:20:31.000Z",
  "title": "Observed Effect of Magnetic Fields on the Propagation of Magnetoacoustic Waves in the Lower Solar Atmosphere",
  "authors": [
    "J. K. Lawrence",
    "A. C. Cadavid"
  ],
  "comment": "19 pages, 6 figures",
  "categories": [
    "astro-ph.SR"
  ],
  "abstract": "We study Hinode/SOT-FG observations of intensity fluctuations in Ca II H-line and G-band image sequences and their relation to simultaneous and co-spatial magnetic field measurements. We explore the G-band and H-line intensity oscillation spectra both separately and comparatively via their relative phase differences, time delays and cross-coherences. In the non-magnetic situations, both sets of fluctuations show strong oscillatory power in the 3 - 7 mHz band centered at 4.5 mHz, but this is suppressed as magnetic field increases. A relative phase analysis gives a time delay of H-line after G-band of 20\\pm1 s in non-magnetic situations implying a mean effective height difference of 140 km. The maximum coherence is at 4 - 7 mHz. Under strong magnetic influence the measured delay time shrinks to 11 s with the peak coherence near 4 mHz. A second coherence maximum appears between 7.5 - 10 mHz. Investigation of the locations of this doubled-frequency coherence locates it in diffuse rings outside photospheric magnetic structures. Some possible interpretations of these results are offered.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2012-06-19T23:20:31.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "85-02"
    ],
    "keywords": [
      "lower solar atmosphere",
      "magnetoacoustic waves",
      "rings outside photospheric magnetic structures",
      "diffuse rings outside photospheric magnetic",
      "co-spatial magnetic field measurements"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1007/s11207-012-0059-9",
      "journal": "Solar Physics",
      "year": 2012,
      "month": "Sep",
      "volume": 280,
      "number": 1,
      "pages": 125
    },
    "note": {
      "typesetting": "TeX",
      "pages": 19,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1118800,
      "adsabs": "2012SoPh..280..125L"
    }
  }
}