Aurora

An aurora was a natural light display in the sky. It was caused by particles excited by energetic charged particles travelling along magnetic field lines into a planet's upper atmosphere. (COMIC: The First)

In northern latitudes this effect was known as the aurora borealis. Goronwy saw such an effect in the skies of Wales. (TV: Delta and the Bannermen) The Sixth Doctor compared the colourful sky of Capron to the aurora borealis. (AUDIO: The Macros)

In southern latitudes this effect was known as the aurora australis. The Tenth Doctor and Martha Jones visited Antarctica in 1915 to watch the aurora australis, (COMIC: The First) while the Twelfth Doctor and Clara Oswald later saw it after their adventure involving Dr Patricia Audley and her immoral experiments. (COMIC: Blood and Ice) The aurora australis was also visible when the First Doctor, the Twelfth Doctor and Archibald Hamish Lethbridge-Stewart met in Antarctica, and when the three, along with Bill Potts, escaped from Testimony's spaceship. (TV: Twice Upon a Time)

During his first visit to Vortis, the First Doctor saw lights in the sky which looked like the aurora borealis. (PROSE: The Lost Ones) On a subsequent visit, both he and Ian Chesterton saw these lights, the latter also comparing it to the aurora borealis. (TV: The Web Planet)

The Fourth Doctor and Sarah Jane Smith visited to the Sigimund Galaxy to watch the aurora arctialis, which was caused by three suns. (COMIC: The Traitor) In an alternate universe, Omega saw the aurora arctialis. (PROSE: The Infinity Doctors)

The Tenth Doctor and Rose Tyler visited to Serac to see its aurora. (COMIC: The Betrothal of Sontar)