Small-scale structure of the geodynamo inferred from Oersted and Magsat satellite data

  title={Small-scale structure of the geodynamo inferred from Oersted and Magsat satellite data},
  author={G. Hulot and C. Eymin and B. Langlais and M. Mandea and N. Olsen},
  • G. Hulot, C. Eymin, +2 authors N. Olsen
  • Published 2002
  • Medicine, Geology
  • Nature
  • The ‘geodynamo’ in the Earth's liquid outer core produces a magnetic field that dominates the large and medium length scales of the magnetic field observed at the Earth's surface. Here we use data from the currently operating Danish Oersted satellite, and from the US Magsat satellite that operated in 1979/80, to identify and interpret variations in the magnetic field over the past 20 years, down to length scales previously inaccessible. Projected down to the surface of the Earth's core, we… CONTINUE READING
    263 Citations

    Figures and Topics from this paper.

    Paper Mentions

    Quasi-geostrophic flows responsible for the secular variation of the Earth's magnetic field
    • 120
    • Highly Influenced
    • PDF
    Large-Scale Flow in the Core
    • 146
    Can downwelling at the top of the Earth’s core be detected in the geomagnetic secular variation?
    • 29
    • PDF
    Conditions for Earth-like geodynamo models
    • 139
    • PDF
    Secular variation in numerical geodynamo models with lateral variations of boundary heat flow
    • 97
    • Highly Influenced
    • PDF
    Intense equatorial flux spots on the surface of the Earth's core
    • 84


    Morphology of the geomagnetic field and implications for the geodynamo
    • 169
    Global geomagnetic field models for the past 3000 years: transient or permanent flux lobes?
    • 106
    • PDF
    Westward drift, core motions and exchanges of angular momentum between core and mantle
    • 283
    Torsional oscillations and the magnetic field within the Earth's core
    • 121
    Numerical models of the geodynamo and observational constraints
    • 148
    Geomagnetic secular variation
    • 295
    • PDF