Computer Science
Scientific paper
May 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999natur.399..249g&link_type=abstract
Nature, Volume 399, Issue 6733, pp. 249-252 (1999).
Computer Science
135
Scientific paper
Recent advances in palaeomagnetic and dating techniques have led to increasingly precise records of the relative intensity of the Earth's past magnetic field at numerous field sites. The compilation and analysis of these records can provide important constraints on changes in global magnetic field intensity and therefore on the Earth's geodynamo itself. A previous compilation for the past 200kyr integrated 17 marine records into a composite curve, with the geomagnetic origin of the signal supported by an independent analysis of 10Be production made on different cores. The persistence of long-term features in the Earth's magnetic intensity or the existence of long-term periodic changes cannot, however, be resolved in this relatively short time span. Here we present the integration of 33 records of relative palaeointensity into a composite curve spanning the past 800kyr. We find that the intensity of the Earth's dipole field has experienced large-amplitude variations over this time period with pronounced intensity minima coinciding with known excursions in field direction, reflecting the emergence of non-dipole components. No stable periodicity was found in our composite record and therefore our data set does not support the hypothesis that the Earth's orbital parameters have a direct and strong influence on the geodynamo.
Guyodo Yohan
Pierre Valet Jean
No associations
LandOfFree
Global changes in intensity of the Earth's magnetic field during the past 800kyr does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Global changes in intensity of the Earth's magnetic field during the past 800kyr, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Global changes in intensity of the Earth's magnetic field during the past 800kyr will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1193068