{
  "id": "2003.01877",
  "version": "v1",
  "published": "2020-03-04T03:52:51.000Z",
  "updated": "2020-03-04T03:52:51.000Z",
  "title": "Quasi-periodic pulsation detected in Lyman-alpha emission during solar flares",
  "authors": [
    "Dong Li",
    "Lei Lu",
    "Zongjun Ning",
    "Li Feng",
    "Weiqun Gan",
    "Hui Li"
  ],
  "comment": "21 pages, 7 figures, accepted for publication in The Astrophysical Journal",
  "categories": [
    "astro-ph.SR"
  ],
  "abstract": "We investigated the quasi-periodic pulsation (QPP) in Lyman-alpha, X-ray and extreme-ultraviolet (EUV) emissions during two solar flares, i.e., an X-class (SOL2012-01-27T) and a C-class (SOL2016-02-08T). The full-disk Lyman-alpha and X-Ray flux during these solar flares were recorded by the EUV Sensor and X-Ray Sensor on board the Geostationary Operational Environmental Satellite. The {\\deg}are regions were located from the EUV images measured by the Atmospheric Imaging Assembly. The QPP could be identified as a series of regular and periodic peaks in the light curves, and its quasi-periodicity was determined from the global wavelet and Fourier power spectra. A quasi-periodicity at about 3 minutes is detected during the impulsive phase of the X-class flare, which could be explained as the acoustic wave in the chromosphere (e.g., Milligan et al. 2017). Interestingly, a quasi-periodicity at roughly 1 minute is discovered during the entire evolutionary phases of solar flares, including the precursor, impulsive, and gradual phases. This is the first report of 1-minute QPP in the Lyman-alpha emission during solar flares, in particular during the flare precursor. It may be interpreted as a self-oscillatory regime of the magnetic reconnection, such as magnetic dripping.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2020-03-04T03:52:51.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "solar flares",
      "lyman-alpha emission",
      "quasi-periodic pulsation",
      "geostationary operational environmental satellite",
      "quasi-periodicity"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 21,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}