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Evidence for an Atmospheric Airburst of a Huge Bolide over Spain in 939AD as Recorded in Medieval Chronicles

Historical records of meteor showers and, more rarely, fireballs have been found in ancient chronicles all around the world [1-4]. Finding records of bolide airbursts is particularly interesting in order to better understand the influence of these events in tem-perature variations or other anomalies preserved in geological records [5]. In particular, direct evidence of ablated material can be found in ocean cores, ice-cores, peat and lake sediments. Indirect climatic effects asso-ciated to volcanic or extraterrestrial dust veils have been also identified in tree-ring chronologies. Among historical records, medieval chronicles preserved in different parts of Europe have been scarcely explored. We have studied medieval chronicles of Spain and have found records reporting a huge fireball that oc-curred in 939AD.