At www.q-mag.org/huge-spike-in-geomagnetic-field-recorded-in-8th-century-b-… … a huge spike in the geomagnetic field of the Earth is inferred pottery found in the 8th c entury BC kingdom of Judah. What might cause that?
The earth's magnetic field seems to have weakened according to research published by PNAS (Feb 13th 2017). See also https://arstechnica.com/science/2017/02/astonishing-geomagnetic-spike-hi… …. Prior to the decline there was an intense spike. A stronger magnetic field is capable of resisting more forcefuly the solar wind particles. However, conversely, a weak geomagnetic field should all more solar wind plasma to penetrate further into the atmosphere – thereby boosting the amount of C14 in the atmosphere. Is it just a coincidence this time line coincides with the beginnings of the calibration curve> Is there a connection?
The actuality of a spike in intensity and subsequent decline may have given rise to the idea that C14 levels diverged at this time. Since the calibration curve was discovered a host of plateau events have been discerned from the data – but no multiple calibration curves have been thought necessary. In other words, different factors impinge on the calibration – which may or may not have something to do with geomagnetism, variations on the sun, or a depessed atmosphere (squashed downwards). We may therefore wonder if the calibration was really necessary or was it considered expedient as it allowed Egyptologists to keep their chronological scheme without too much tinkering. In doing so they walked into another problem – posed by the Thera volcano.