Jeffro : The curve for the archaeomagnetic intensity is ... strongly
based on carbon dating for the relevant period in the 10th century BCE.
In a previous post on this thread I displayed a table of radiocarbon dates of Tel Rehov V produced in the article C14 dates from Tel Rehov: Iron-Age chronology, pharaohs,
and Hebrew kings (Science 300, 315–318
(2003)). The radiocarbon was tested in four laboratories which came up with four different BP date ranges differing by 84 years between the earliest (2810 + 20) and the latest (2761 - 15) dates. When calibrated it came up with date ranges differing by 94 years between the earliest (971) and the latest (844) BCE dates.
In his article The Debate over the Chronology of the Iron Age in the Southern Levant, 2005, Amihai Mazar states :
In the Beth Shean Valley Archaeological Project (Tel Beth-Shean and Tel Rehov excavations) we obtained about 100 C14 dates from the early Bronze I through the Iron IIA periods, measured in four different laboratories. The results enable appreciation of both the capabilities of the method as well as its limitations and possible flaws. The many stages of selecting the samples, the pre-treatment, the method and process of dating, and the wide standard deviation of Accelerator Mass Spectrometry dates may create a consistent bias, outliers, or an incoherent series of dates. The calibration process adds further problems, related to the nature of the calibration curve in each period.
My intention is not to raise a debate about carbon 14 dating, but only to say it is not precise and if the curve of the archaeomagnetic intensity is strongly based on the carbon dating then that, too, is not fixed in stone.