Mathematics – Logic
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....4510s&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #4510
Mathematics
Logic
Scientific paper
Curves of archaeomagnetic secular variation can be used for dating of archaeological structures such as ovens or fireplaces. As the patterns of secular variation are regional a sufficient database is needed for areas in the order of 1000 km radius. The review will show that new data are available e.g. for Spain, Italy, Switzerland, France or Germany. The recent advances in the archaeomagnetic database of Germany allow now to present a secular variation curve for Germany covering the past 3000 years. In shows a roughly sinusoidal variation of inclination with an amplitude of about 25^o. After strongly eastern declinations at the end of the bronze age, the field pointed slightly to the west or to geographic N in the Roman epoch, while eastern declinations were observed throughout the middle age. Compared with the updated French secular variation curve (Gallet et al., Phys. Earth Planet. Int., 131: 81, 2002) a very similar pattern is observed with a shift in time of about 50 years. Nevertheless details of such curves seem to depend on the algorithm used for averaging the data of a region. The well known sliding window techniques will be compared with the Bayesian spline smoothing technique. The latter does not require to choose the window size and can take into account the directional and temporal error margins as well as stratigraphic constraints. A smooth curve with an error envelope is obtained. Mayor progress also was made concerning archaeointensities for NW and Central Europe especially in France, Denmark and Germany. These new data allow to trace back in more detail the intensity from the historical records of the 19th century for about 2000 years. Local maxima of intensity are seen at the beginning and the end of the first millennium AD and in the middle of the second millennium AD.
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