This image was taken by IMAGE's EUV imager instrument on August 11, 2000. IMAGE was looking down on the Earth from above the north pole. In this false-color image, you can see a circle in the middle where the Earth is. You can see the Earth's own shadow cast to the bottom left. You can see glowing near the center of the circle - that's the auroral lights. And finally, you can see the tail of the magnetosphere (upper left) being swept back by the solar wind.
Courtesy of NASA and the IMAGE science team