Sporadic aurora from Spain

Abstract

Some authors have shown recently that "sporadic auroras" have occurred at relatively low latitude when the geomagnetic activity is quiet or moderate. Here we present and analyze a case of "sporadic aurora" observed from Spain on the 29 December 1845 and compare its low geomagnetic activity with other three aurorae also observed in Spain in mid-19th century. Copyright © The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences; TERRAPUB.