MagNetZ with Phil Livermore (2021/05/19) - Archeomagnetic variations of geomagnetic spikes
Channel: MagNetZ
Date: 2021-05-20

The video is also available for download at: https://earthref.org/ERDA/2469/
and can be referenced with the doi: 10.7288/V4/ERDA/2469

Title: Archeomagnetic intensity variations during the era of geomagnetic spikes in the Levant
Author: Phil Livermore from the University of Leeds, UK 
Author Website: https://environment.leeds.ac.uk/see/staff/1381/dr-phil-livermore

Archeomagnetic analyses of densely sampled artefacts from the Near-East have suggested that the intensity variation during the first millennium BCE was punctuated with two geomagnetic spikes with rates of change of intensity exceeding 1 μT/yr, whose extreme behaviour is challenging to explain from a geodynamo perspective. I will describe a new transdimensional Bayesian method designed to capture variations on both long and short timescales, which when applied to data only at the fragment (thermal- unit) level requires a complex intensity variation with no less than six spikes, each with an approximate duration of between 30 and 100 years. However, the nature of the inferred intensity evolution and the number of spikes detected are fragile and highly dependent on the specific treatment of the archeomagnetic data.