I came across this remarkable event while reading about Barcelona in the Civil War
The “aurora borealis” is a luminescent meteor, a phenomenon that frequently happens in areas close to the North Pole and which can also be seen in rather exceptional circumstances in regions of Central Europe. So the aurora borealis that could quite clearly be seen from the Pyrenees, and even from the top of the Tibidabo hill in Barcelona, on the 25th of January 1938, was an absolutely unusual occurrence. It was in fact a unique experience. There are no known accounts of any other event of that kind at such meridional latitudes. Furthermore, the phenomenon took place in the midst of war, thus causing terrible confusion and shock among the soldiers who were fighting on the Aragonese front.