The Kp-index is a global geomagnetic storm index with a scale of 0 to 9. Based on the Kp-index, you can immediately know if there is a chance to see aurora or not. On the world map below, the average equatorward boundary of the midnight aurora is shown based on the current predicted Kp-index. This gives us a good indication where we could see the aurora right now in areas where the current local time is close to midnight. The higher the Kp climbs, the closer the lines move towards the equator.
Keep in mind that this is not a precise boundary and the auroral oval could be slightly more northward or southward than indicated on this map. Use this map as a quick guide. If you are close to the position of the line on this map then you have a chance to see the aurora about 20º above the horizon.
|1o -> 3+||Quiet magnetic field|
|4o -> 5-||Active magnetic field|
|5o -> 8+||Storm|
|Predicted Kp max||4|
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15:33 Apr 18 2014
|Minor S1 class Space Radiation Storm - This happens around 50 times in a solar cycle|
13:21 Apr 18 2014
|Strong M7.31 solar flare|
20:15 Apr 16 2014
|Moderately strong M1.03 solar flare|
|Last geomagnetic storm:||2014/04/12||Kp5 (G1)|