Northern Lights Now – Quick Update: The expected coronal hole high speed stream arrived with a bang. KP levels have reached G2 and the forecast calls for KP=7.33 in the next hour.
Aurora reports have been streaming in from Northern Europe and Iceland over the last couple hours. As the Sun sets across Eastern North America, expect additional reports to come in from the Northern United States and Canada.
Northern Lights Now – Update from yesterday’s post – SWPC has extended the geomagnetic storm watch into September 28 and is now calling for G2 storming. G2 storming means that KP values could exceed 5.67, strong enough for mid-latitudes to get a display of aurora.
The Moon is will be just shy of 1st quarter, so viewing conditions should be favorable.
Northern Lights Now – The expected G1/G2 storming from the coronal hole pointed towards Earth on Sept 11 arrived late on Sept 13. It induced a period of fast solar wind, strong Bt and G2 storming. The timing was good for our aurora hunting followers in Northern Europe who had clear skies.
At the onset of the storm, Bz was strongly (-15 to -18 nT) south for over half an hour at the beginning of the storm, which set up Earth’s magnetosphere to be highly activated. This means that any additional strong wind, high density, or prolonged negative Bz can quickly jump the KP back into G1/G2 range.
Here are a couple Tweets share with NLN from tonight’s storming
From the Nidderdale in northern Yorks by @HudsonWeather
It is still possible that there could be additional storming. Keep your eyes on the Solar Wind Data. If there is a prolonged people (more than 45 mins or so) of negative Bz, there could be another round of storming.
Note: The current storm is likely the last for a while. There are now active regions that pose M or X class flare threats on the Sun and the next Coronal hole isn’t expected to reach Earth until late September. Make hay while the Sun shines!