The Aurora Borealis manifests itself in a huge ring above the Earth's Geomagnetic North Pole which is referred to as the Auroral Oval. You might expect this oval to be visible from the same altitude around the globe but because it is centred on true north rather than the geographical North Pole, this is not the case. For example, fairly minor geomagnetic activity, let's say Kp3 will cause the lights to appear at a latitude of around 65°N to watchers in Northern Scandinavia but in central parts of North America it will likely be visible as far south as 50°N. The best way to illustrate... The Ovation map is created using real time.... Essentially, the OVATION Aurora Forecast Model is closest science has come to accurately.... Top image credit: NASA