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  • 1
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    The first Antarctic geomagnetic Reference Model (ARM) (2008)
    AGU
    Details
    Publication Date: 2012-02-03
    Description: Spherical Cap Harmonic Analysis has been applied to obtain a reference model of geomagnetic secular change for Antarctica valid for the last forty years. In this paper, we use the latest available observatory data to update this model and to compare it with the 8th generation IGRF. In addition, the selected set of total field values used for the generation of the Oersted Initial Field Model have been employed together with observatory data to develop the first complete Antarctic Reference Model (ARM). This model improves the fit to the secular variation deduced from observatory data by about 60% relative to IGRF, and the fit to observatory and satellite field data by 8%. The model allows merging data sets taken at different altitudes and epochs in Antarctica, where significant temporal geomagnetic variations occur.
    Description: Published
    Description: 1192
    Description: JCR Journal
    Description: reserved
    Keywords: Geomagnetic reference fields ; Geomagnetic spatial variations (all harmonics and anomalies) ; Geomagnetic time variations - secular and long term ; 04. Solid Earth::04.05. Geomagnetism::04.05.03. Global and regional models ; 04. Solid Earth::04.05. Geomagnetism::04.05.04. Magnetic anomalies ; 04. Solid Earth::04.05. Geomagnetism::04.05.05. Main geomagnetic field
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
    Location Call Number Limitation Availability
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    PAPER (OA)
  • 2
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    A direct divider method for self-affine fractal profiles and surfaces (2008)
    AGU
    Details
    Publication Date: 2017-04-04
    Description: Many profiles and surfaces of interest in geology and geophysics can be modelled by self-affine fractals. The divider method was the first method introduced in fractal analysis, is generally suitable for self-similar fractals, and has been adapted by Brown [1987] using a multi-step approach to estimate the fractal dimension of self-affine profiles. Here, we improve the method in order to be a 1-step technique, but showing also that it is in practice another form of the variance method. Then, we generalise the divider method to self-affine fractal surfaces. The method is tested with application to synthetic one- and two-dimensional functions of known fractal dimension.
    Description: Published
    Description: 2099-2102
    Description: JCR Journal
    Description: reserved
    Keywords: Fractal analysis ; self-affine fractals ; fractal dynamics ; 04. Solid Earth::04.05. Geomagnetism::04.05.05. Main geomagnetic field ; 05. General::05.05. Mathematical geophysics::05.05.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    PAPER (OA)
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