Mathematics – Logic
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999ep%26s...51.1325o&link_type=abstract
Earth, Planets and Space, Volume 51, p. 1325-1329.
Mathematics
Logic
2
Scientific paper
A total of 115 ceramic specimens out of 41 samples from 9 archeological sites in Giza, Fayoum, Benisuef, El Minia, Malawy, and Sohag were collected. They represent 14 well-determined ages covering the last 6000 years. Rock magnetic properties such as Curie temperature and hysteresis loops have been measured for these samples to identify the magnetic carrier; it is found to be fine-grained magnetite. All specimens were investigated using the classic Thellier double heating technique (Thellier and Thellier, 1959) and the modification after Odah et al.(1995) to obtain the paleointensity data. These paleointensities and the previous results of Odah et al.(1995) were used to improve the secular variation curve of the geomagnetic field in Egypt for the last 6000 years. This curve shows a maximum of 72.8 mT at about 250 AD and a minimum of 33 mT at about 3500 BCnull. It also shows a general decrease of the magnetic moment during the last 2000 years.
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