Study of Schumann resonances based on magnetotelluric records from the western Mediterranean and Antarctica

DOI Web Site Web Site 被引用文献2件
  • S. Toledo‐Redondo
    Department of Electromagnetism and Matter Physics University of Granada Granada Spain
  • A. Salinas
    Department of Electromagnetism and Matter Physics University of Granada Granada Spain
  • J. Portí
    Department of Applied Physics University of Granada Granada Spain
  • J. A. Morente
    Department of Applied Physics University of Granada Granada Spain
  • J. Fornieles
    Department of Electromagnetism and Matter Physics University of Granada Granada Spain
  • A. Méndez
    Department of Electromagnetism and Matter Physics University of Granada Granada Spain
  • J. Galindo‐Zaldívar
    Department of Geodynamics University of Granada Granada Spain
  • A. Pedrera
    Instituto Geológico y Minero de España Granada Spain
  • A. Ruiz‐Constán
    Department of Geodynamics University of Granada Granada Spain
  • F. Anahnah
    Department of Geodynamics University of Granada Granada Spain

書誌事項

公開日
2010-11-23
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1029/2010jd014316
公開者
American Geophysical Union (AGU)

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説明

<jats:p>Eight independent magnetotelluric (MT) campaigns, carried out in the western Mediterranean area and Antarctica, have been analyzed with the aim of extracting information from Schumann resonances (SR). The advantages and drawbacks of MT data with respect to single‐purpose fixed stations for SR research are evaluated. Two different methods of signal processing have been employed: spectral analysis through the fast Fourier transform (FFT) and Rescaled Range analysis (R/S), calculating the Hurst exponents. The first permitted a study of the source contributions, the effects caused by local changes in the observation area, interseasonal behavior, and the relations between electric and magnetic horizontal fields. The average central frequencies obtained for the first three resonances are 7.8, 14, and 20.5 Hz respectively, but there are fluctuations in them. These variations seem to respond to the characteristics of the principal active storms that generate the resonances. These frequency shifts are stronger for the second and third resonances. Owing to the broadband registering of MT, the second method of signal processing could be applied to the low noise signals from Antarctica with high resolution, revealing the persistent nature of SR. A numerical simulation indicates a way for inferring lightning rates from R/S analysis.</jats:p>

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