Coronal hole faces Earth

Friday, 14 September 2018 - 15:15 UTC

Coronal hole faces Earth

The previous coronal hole solar wind stream gave us some great auroral displays around the world as it caused moderate G2 geomagnetic storm conditions on 11 September which was predicted perfectly by the NOAA SWPC. Today we have yet another coronal hole facing our planet which should be exciting news for aurora watchers at high latitude locations!

We are dealing with a transequatorial coronal hole today. This coronal hole changed quite a bit since it last faced our planet. The speed of the solar wind reached well over 600km/s last time around but the interplanetary magnetic field never really cooperated and a maximum of Kp4 (active geomagnetic conditions) were recorded on 20 August.

Similar stats are likely this time around when the high speed solar wind stream from this coronal hole arrives. This could occur in about three days from now which would be on Monday, 17 September. Active geomagnetic conditions (Kp4) are once again likely with a chance for minor G1 geomagnetic storm conditions. Considering we are so close to the equinox, this should also be taken into account as solar storms can be stronger than expected around the equinoxes.

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Current data suggest that it is not possible to see aurora now at middle latitudes

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