What does this image represent?

The OVATION model is a 30-40 minute aurora forecast using data provided by the ACE spacecraft. Using the latest real-time solar wind and interplanetary magnetic field (IMF) data, a forecast for a visual aurora displays intensity and location is automatically created. If you are located within the red view line area, then it may be possible to witness visual aurora when looking to the northern sky if viewing conditions are good.

Example of an OVATION forecast during a geomagnetic storm

For more information regarding the OVATION model visit the following link http://helios.swpc.noaa.gov/ovation/.