Quiet space weather, Coronal hole

Saturday, 16 June 2018 - 09:46 UTC

Quiet space weather, Coronal hole

The beginning of June has been very quiet when it comes to space weather. While we did reach minor G1 geomagnetic storm conditions back on the very first day of this month, no other space weather events have occurred which are worth mentioning. The solar wind conditions at Earth have been very underwhelming for a while now and the Sun has also been very quiet as we are starting to reach solar minimum conditions. That said, our automated coronal hole detection system spotted an opening in the corona yesterday. A southern extension of the northern hemisphere polar coronal hole was facing our planet today.

As you can see, it is only a very minor opening that stretches southward from the northern hemisphere polar coronal hole but it was enough to trigger the detector. A minor solar wind enhancement is possible based on STEREO Ahead data with the solar wind speed topping out somewhere between 400 and 500km/s and the total strength of the interplanetary magnetic field (Bt) could increase to a maximum of 10nT. No numbers to get terribly excited about but if you are a high latitude sky watcher not plagued by the midnight sun like our friends over in the southern hemisphere, it might be worth your time to stay alert around 18 (Monday) and 19 (Tuesday) June. Kp3 (unsettled conditions) are possible with a slight chance of active geomagnetic conditions which stands for a Kp on 4.

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Current data suggest that it is not possible to see aurora now at middle latitudes
The density of the solar wind is moderate (22.75 p/cm3)

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