Auroras have been observed across the world, including parts of Japan, after a series of solar flares erupted from the sun, while sightings may continue over the coming days. Japan’s National Institute of Information and Communications Technology said that since Wednesday there have been at least seven eruptions on the sun’s surface, which likely triggered a geomagnetic storm. The government agency cautioned that global positioning and communications systems could be disrupted. The northern lights are believed to have been spotted in Hokkaido and Ishikawa Prefecture, northern and central Japan…