Sentences with phrase «auroral sightings»

We discuss the East Asian naked - eye sunspot observations, the telescopic solar observations, the fraction of sunspot active days, the latitudinal extent of sunspot positions, auroral sightings at high latitudes, cosmogenic radionuclide data as well as solar eclipse observations for that period.

Magnetic storms recorded as auroral sightings in Meigetsuki («The Record of the Clear Moon,» ca 1180 - 1241) by Fujiwara no Teika of Japan, and in Song Shi («History of Song,» commissioned 1343) from China, have given researchers the ability to reconstruct a chronology of past astronomical events.