From the Presidential election in Russia to Super Tuesday in the U.S. to fires in Congo and the Iditarod Trail Sled Dog Race in Alaska, TIME’s photo department presents the best images of the week.
A riot of color in the night sky above the Arctic Circle gave local photographers a spectacular light show this September. Sometimes called the aurora borealis, the northern lights are caused by streams of particle-charged solar winds that hit the Earth’s magnetic field, causing hues of green and pink to shimmer against the backdrop of the stars. This year, professional and amateur photographers were able to capture the lights in more southerly latitudes than usual. Herewith, a small sampling of what they saw.