Earlier this week – on October 2, 2013 – a coronal mass ejection struck Earth’s magnetic field. It created a G2-class geomagnetic storm and filled Earth’s northern skies with auroras. Thomas Kast in Finland posted this photo on EarthSky’s Facebook page. He wrote:
Last night (2 October 2013) was a special aurora night and this is only one photo of many. For a long time I wanted to capture auroras with a field of sparse tall trees. The huge layer of faint green in the sky brought out the silhouettes even better than I hoped for. At times it was very foggy as you can see at the bottom. What an amazing atmosphere it was.
Thank you, Thomas!
Eleanor Imster has helped write and edit EarthSky since 1995. She was an integral part of the award-winning EarthSky radio series almost since it began until it ended in 2013. Today, as Lead Editor at EarthSky.org, she helps present the science and nature stories and photos you enjoy. She also serves as one of the voices of EarthSky on social media platforms including Facebook, Twitter and G+. She and her husband live in Tennessee and have two grown sons.