View in EDS

Spatial and temporal spectra of the geomagnetic field and their scaling properties

Saved in:
Bibliographic Details
Title: Spatial and temporal spectra of the geomagnetic field and their scaling properties
Authors: De Santis, A.1 desantisag@ingv.it, Barraclough, D.R.2, Tozzi, R.1
Source: Physics of the Earth & Planetary Interiors. Feb2003, Vol. 135 Issue 2/3, p125. 10p.
Subjects: Fourier transform spectroscopy, Geomagnetism
Abstract: Many natural phenomena show a relationship between their spatial and temporal Fourier spectra. This paper discusses such a connection for the geomagnetic field, when some assumptions are made about the (exponential or power-law) behaviour of the spatial power spectrum of the field itself and that of its time derivative (the spatial spectrum of the secular variation) as estimated from global geomagnetic field models. It is shown that, under either assumption, the temporal spectrum of the geomagnetic field computed at the core–mantle boundary (CMB) would have a power-law behaviour with a negative spectral exponent of about 0.5. At the Earth’s surface, although the temporal spectrum obtained from the power-law spatial model assumes a slightly more complicated form, it can be practically approximated with a power law with a negative exponent of about 3.6. Analysis of magnetic observatory data confirms these results and that the starting hypotheses are reasonable, especially in view of the possibly chaotic state of the dynamical processes underlying the generation and maintenance of the geomagnetic field. [Copyright &y& Elsevier]
Copyright of Physics of the Earth & Planetary Interiors is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
FullText Text:
  Availability: 0
Header DbId: egs
DbLabel: Engineering Source
An: 9289151
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
IllustrationInfo
Items – Name: Title
  Label: Title
  Group: Ti
  Data: Spatial and temporal spectra of the geomagnetic field and their scaling properties
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22De+Santis%2C+A%2E%22">De Santis, A.</searchLink><relatesTo>1</relatesTo><i> desantisag@ingv.it</i><br /><searchLink fieldCode="AR" term="%22Barraclough%2C+D%2ER%2E%22">Barraclough, D.R.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Tozzi%2C+R%2E%22">Tozzi, R.</searchLink><relatesTo>1</relatesTo>
– Name: TitleSource
  Label: Source
  Group: Src
  Data: <searchLink fieldCode="JN" term="%22Physics+of+the+Earth+%26+Planetary+Interiors%22">Physics of the Earth & Planetary Interiors</searchLink>. Feb2003, Vol. 135 Issue 2/3, p125. 10p.
– Name: Subject
  Label: Subjects
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Fourier+transform+spectroscopy%22">Fourier transform spectroscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Geomagnetism%22">Geomagnetism</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Many natural phenomena show a relationship between their spatial and temporal Fourier spectra. This paper discusses such a connection for the geomagnetic field, when some assumptions are made about the (exponential or power-law) behaviour of the spatial power spectrum of the field itself and that of its time derivative (the spatial spectrum of the secular variation) as estimated from global geomagnetic field models. It is shown that, under either assumption, the temporal spectrum of the geomagnetic field computed at the core–mantle boundary (CMB) would have a power-law behaviour with a negative spectral exponent of about 0.5. At the Earth’s surface, although the temporal spectrum obtained from the power-law spatial model assumes a slightly more complicated form, it can be practically approximated with a power law with a negative exponent of about 3.6. Analysis of magnetic observatory data confirms these results and that the starting hypotheses are reasonable, especially in view of the possibly chaotic state of the dynamical processes underlying the generation and maintenance of the geomagnetic field. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Physics of the Earth & Planetary Interiors is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=9289151
RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1016/S0031-9201(02)00211-X
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 10
        StartPage: 125
    Subjects:
      – SubjectFull: Fourier transform spectroscopy
        Type: general
      – SubjectFull: Geomagnetism
        Type: general
    Titles:
      – TitleFull: Spatial and temporal spectra of the geomagnetic field and their scaling properties
        Type: main
  BibRelationships:
    HasContributorRelationships:
      – PersonEntity:
          Name:
            NameFull: De Santis, A.
      – PersonEntity:
          Name:
            NameFull: Barraclough, D.R.
      – PersonEntity:
          Name:
            NameFull: Tozzi, R.
    IsPartOfRelationships:
      – BibEntity:
          Dates:
            – D: 25
              M: 02
              Text: Feb2003
              Type: published
              Y: 2003
          Identifiers:
            – Type: issn-print
              Value: 00319201
          Numbering:
            – Type: volume
              Value: 135
            – Type: issue
              Value: 2/3
          Titles:
            – TitleFull: Physics of the Earth & Planetary Interiors
              Type: main
ResultId 1