A particularly notable use has been in the creation of temporally continuous models of the global Holocene geomagnetic field (e.g., Korte et al. 2014), with possible implications for length of day variations on millennial time scales (Dumberry and Bloxham 2006); the behavior of high latitude flux patches (Korte and Holme 2010; Amit et al.
2011); hemispheric field asymmetries related to archeomagnetic jerks (Gallet et al. Similarly, studies of cosmic ray ionization in the troposphere (Usoskin et al.
Concurrently, the production of new archeomagnetic data strongly increased as a result of the European AARCH project (2002 to 2006) (Figure 1), which aimed to improve European regional reference curves for geomagnetic dating of archeological materials (e.g., Gómez-Paccard et al. In June 2008, archeo/volcanic directions and intensity data with increased metadata were made accessible through an updated data model in GEOMAGIA50.v2 ( which included global data sets compiled for specific modeling purposes (Constable et al. In contrast, the simpler structure and web query interface provided by GEOMAGIA50 provides a straightforward way to recover selected but extremely useful results with specific attributes from identified locations and age ranges.
(2006a); Márton and Ferencz (2006); Schnepp and Lanos (2006); Tema et al. Mag IC also accepts these more limited data sets, and since 2007, the collaborative intent has been to share information between GEOMAGIA50 and Mag IC, so that effort expended in populating one database does not need to be duplicated later.
GEOMAGIA50.v3 is a comprehensive online database providing access to published paleomagnetic, rock magnetic, and chronological data from a variety of materials that record Earth’s magnetic field over the past 50 ka.
Since its original release in 2006, the structure and function of the database have been updated and a significant number of data have been added.
These continually updated lists acknowledged the significant effort in acquiring data, including the reality that it is not always possible to repeat field or experimental work, and allowed future generations to build new interpretations that took into account pre-existing results. The aim of the GEOMAGIA50 database is to provide easy access to the significant amount of paleomagnetic, rock magnetic, and chronological data covering the past 50 ka that have been obtained from archeological materials, volcanic rocks, and sediments.
The same advantages apply to more modern paleomagnetic and rock magnetic data compilations based on relational databases (beginning with the IAGA Global Paleomagnetic Database (GPMDB), Lock and Mc Elhinny 1991; Mc Elhinny and Lock 1996; Pisarevsky 2005) that have now evolved the potential to store highly detailed information ranging from raw field and laboratory measurements through multiple processing steps to results (e.g., Mag IC, Constable et al. These data have a range of applications within geosciences.
Robustly constrained temporal variations in the geomagnetic field can be used to date the time of firing of archeological materials, the emplacement of lavas, or the deposition of sediments. (2008); Hagstrum and Blinman (2010); Márton (2010); Shaar et al.We review the paleomagnetic methods used to obtain these data and discuss applications of the data within the database.