Tour guide operator and founder of Sweden's Lights Over Lapland www.lightsoverlapland.com Chad Blakley, says what was originally thought to be a UFO (unidentified flying object) over Abisko National Park turned out to likely be a fuel trail from a rocket launched from California.

After investigating and with the help of amateur space weather enthusiasts, he said the anomaly was likely due to an Atlas V rocket that had blasted off from Vandenberg Air Force Base in California, United States, several hours earlier carrying the Worldview 4 satellite to orbit.

"We started getting reports from people reading this website that they believe it had been a cloud from the rocket fuel had been dumped from an Atlas V rocket," Blakley said.

Lights Over Lapland caters to tourists who travel to the Arctic to photograph and film the northern lights auroras.

"I have to admit you are standing out in a frozen area in the Arctic, you're looking up in the sky you see what appears to be something you can't explain, it does have a tendency to take your mind to very interesting places," Blakley said.