Thanksgiving Aurora – G1 and G2 Storms Ongoing

Share Button

Northern Lights Now – Active space weather has been providing beautiful aurora and northern lights this Thanksgiving and Black Friday. A large coronal hole is producing strong solar wind which is inducing periods of dancing skies for aurora hunters across the high latitudes. As of Friday, storming levels have reached G2 conditions meaning Northern lights may be visible in a band across Northern Europe, Iceland, Canada, and the Norther US states.

This quick real-time video taken in Kiruna, Sweden Thursday night show a sky full of green and pulsating blues and whites:

At the time of this post, a new round of G2 storming is starting. Viewers with clear skies across Northern North America may be in for a treat!

Happy Hunting

G1 Storm Watch Posted for November 8

Share Button

Update 0330 GMT – 10:30pm EST

It appears the CME missed Earth, probably to the West and North. It is unlikely at this point there will be any aurora storming tonight.

Original Post
Northern Lights Now – The CME from the November 5 filament eruption is now expected to arrive at Earth late on Nov 8 and produce G1 storming. SWPC has issued a G1 geomagnetic storm watch. This forecast is lower confidence and more variable than usual. The current predicted timing shows that the period of KP=5 or higher is likely to happen at the end of the UTC day (or just after sunset on the US East coast and around midnight in Europe)

NLN AuroraCast shows the aurora forecast for potential G1 storming at the end of Nov 8 UTC
NLN AuroraCast shows the aurora forecast for potential G1 storming at the end of Nov 8 UTC

This forecast is low confidence because the majority of the CME is likely to go to the north and west of Earth. If Earth is hit, it will likely be a glancing blow. Further, it is impossible to predict the orientation of the cloud of plasma. If it happens to be oriented with a strong Bz south component, the KP could reach values higher the G1. If it is oriented with a strong positive Bz component, it’s unlikely KP values will read higher than 3 or 4. This is a classic wait-and-see storm.

Here is the WSA-Enlil model output from SWPC. It shows that when the CME arrives, it is likely to have a high proton density. This high proton density, at the same time as increasing solar wind are the primary motivations for issuing the G1 watch (click image for full size):

WSA-Enlil model shows CME arriving midday on Nov 8
WSA-Enlil model shows CME arriving midday on Nov 8

Happy Hunting!

Filaments and a Flare in Early November

Share Button

Northern Lights Now – There have been several notable eruptions on the Sun since November 4th. As of now, models are not indicating G1 storming, but with the combination of events, and models predicting KP=4, it is not out of the question that there may be some G1 storming between 11/8 and 11/9.

Early on the 4th a filament erupted from the SW portion of the disk. There is a clear CME lift off, but it appears to be headed mostly to the South and West of the Earth-Sun line. Here is an animatedGIF showing about 4 hours in AIA 304 with showing the filament erupting

Filament erupts off in the SW quadrant of the Solar disk early on Nov 4 UTC
Filament erupts off in the SW quadrant of the Solar disk early on Nov 4 UTC

About 6 hours later, a small B2.2 flare happened around an unnumbered region in the NW quadrant. Just after this low level eruption, a wave is visible traveling southward through the corona. Dimming was also seen in automated CME detection during this flare. Often, dimming is indicative of a launching CME, but there was no clear sign of a CME on LASCO. If this flare did launch a CME towards Earth, it will be a stealth CME. This flare was optical only and did not register on NLN’s Solar Flare Browsing page. In this video, the first half shows the full disk, the second half zooms in on the actual flare.

Finally, a pair of filaments erupted early on the 5th. The first, bigger one launched from the NW quadrant of the Solar disk from a location just north of the area of the B2.2 flare. This filament also showed what looked to be a launching CME on AIA 304, however most of the material looks to be traveling North and West. The other filament erupted on the East of the disk at nearly the same time and is much smaller. They are both visible in this AIA 193 imagery, the second is just barely visible.

Filament erupts off the north west limb early on Nov 5. Shown in AIA 193
Filament erupts off the north west limb early on Nov 5. Shown in AIA 193

Happy Hunting!