Computer Science
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995crasb.320..903c&link_type=abstract
Comptes Rendus de l'Academie des Sciences, Sér. II, Fasc. a, Tome 320, No. 10, p. 903 - 922
Computer Science
4
Geomagnetic Field: Secular Variations, Geomagnetic Field: Reversals, Geomagnetic Field: Palaeomagnetism
Scientific paper
Secular variation is defined as those changes in the geomagnetic field with a duration in excess of several decades and an origin in the Earth's liquid core. For over a century, magnetic observatories have revealed the main features of this secular variation. Historical data acquired since the 17 century yield a fascinating, if more uncertain, picture. Apart from that of the axial dipole, the characteristic duration of secular variation does not exceed a few centuries: therefore, historical data do not allow one to test the persistence of the field. Palaeomagnetism provides one with the only route further back in time. The picture which emerges is that of a simple, low degree, persistent field with superimposed random variations, reminiscent of the present-day non-dipole field.
Courtillot Vincent
Pierre Valet Jean
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