Using PHP and MySQL for Ranking and Displaying Archeomagnetic Data

We present a new archeointensity database application that stores data of the Earth’s magnetic field intensity for the last 7000 years. Our application allows users to query and rank data according to selectable criteria. It is also possible to plot the data as archeointensity curves. Users can access the database using any Web browser and see the results of their queries immediately on the screen. The results are displayed as tables and figures that can also be downloaded to the user’s own computer. We used the database application to perform a preliminary analysis of archeointensity curves. The analysis indicates a longitudinal dependence of similar features on the curves. The features appear to be moving westwards over time which is probably due to the westward drift of the non-dipole field.