What's up in space Thursday, Sep. 5, 2019 Spaceweather.com BE ALERT FOR PURPLE SUNSETS: Tonight when the sun goes down, step outside into the twilight. You might find yourself surrounded by purple. That's what happened to Piotr Wieczorek of Jeziory Małe, Poland, on August 31st: "The purple was everywhere," says Wieczorek, "even reflected in the water of the lake." If this happens to you, blame a volcano. This summer, two volcanoes have spewed sulfurous gas into the stratosphere: the Raikoke volcano in the Kirul Islands (June 22nd) and the Ulawun volcano in New Guinea (Aug. 3rd). Fine volcanic aerosols in the stratosphere scatter blue light which, when mixed with ordinary sunset red, produces a purple hue. Sky watchers have been seeing purple sunsets ever since Raikoke erupted. The volcanic gas appears to be patchily distributed, bringing strange sunsets on some nights, but not all. Clear air, lack of clouds, and country settings improves their visibility.