Tag Archives: G3

Live Storm Updates – G2 Aurora Now

Northern Lights Now – This post contains live updates to the storm predicted in Coronal Hole Prompts G1 Aurora Watch for Sat/Sun March 3rd and 4th.

March 7, 2016 03:45UTC (10:45 PM EST)

Tonight’s Aurora show has ended for most viewers. There may still be some good photos come in from areas that only need KP=4, but for the mostpart it’s time to good to bed for the sleep deprived intrepid aurora hunters. By all accounts it has been a terrific night. The official prediction was for a single 3-hour period of KP=5, but there were 12 hours with the KP in the G1 zone with a peak period of G3 activity:

Boulder KP readings show 12 hours of G1, G2, and G3 activity
Boulder KP readings show 12 hours of of G1, G2, and G3 activity

This evening Eastern North America joined in the action just as the storm was abating – hunters in Prince Edward Island, Maine and New Hampshire all reported success:

PEI from aurora hunter John Morris:

Maine from our friend Rob Wright:

New Hampshire from the Mount Washington Observatory atop the White Mountains:

March 7, 2016 00:30UTC (7:30 PM EST)

The storm has started to abated just a little. But it has been great. We haven’t seen any aurora posted by hunters in North America yet, but we expect at least some from Maine and PEI soon. Bz has been north over the last 20 minutes. If it stays that way, the show will be over in about 45 minutes. If it shifts back to the south, even parts of the midwest could have an opportunity for aurora tonight.

March 6, 2016 19:30UTC (5:30 PM EST)

This is an absolutely amazing storm! Bz continues to be south as much as 10nT, Bt has been between 10nT and 20nT for hours, and there are clear skies in much of the UK and Ireland. One indicator of the strength of this is storm is all the reports of Red hues to the aurora.

Check out these wonderful aurora tweets:

March 6, 2016 17:00UTC (3:00 PM EST)

This storm is continuing to get stronger. KP is predicted to be 6.67 in 45 minutes. Aurora reports are streaming in on Twitter from


Northumberland :

and Netherlands:

March 6, 2016 16:00UTC (2:00 PM EST)

As expected, the Wing KP model was under-estimating the strength of this storm. The Boulder Kp which is based on ground measurments over the last three hours was just updated to 5.67 indicating G2 storming. There is nothing in the data to suggest this won’t be a very good storm for Europe and possibly Iceland and the northeastern US once it gets dark. Here’s a snapshot of the current Ovation model output:

Ovation shows the extent and strength of Aurora continuing to increase
Ovation shows the extent and strength of Aurora continuing to increase

March 6, 2016 13:00UTC (11:00 PM EST)

Solar wind data at ACE is indicating that the high speed solar wind from the coronal hole is arriving. The Bz component of the magnetic field is oriented south and has been for over an hour and a half. Wing KP (which the graph to the right and in the post below) is based on is indicating a predicted KP of 4.00. This likely an underestimate of the actual KP. Once the Boulder ground-based KP readings come in, the wing KP model will respond with higher readings. This is looking like it could be a good storm!

Wing KP is showing expected KP of 4.0 soon
Wing KP is showing expected KP of 4.0 soon

New Year’s 2016 Aurora Predicted – G3 Storming

UPDATE: 20:00UTC December 31

The New Year’s Aurora of 2016 is playing out as expected in the “slower CME, longer storm” forecast scenario. There have been a few periods of G1-G2 storming. Wing-KP was overestimating the Kp and calling for 7+ earlier in the day. About 2 hours ago, Bz shifted strongly to the south and it has been in the -15nT to -17nT range since. It’s likely that the Wing-Kp model is now underestimating the actual extend of the aurora. The next 1-4 hours could produce some very good aurora. It even look likes there may be some clearing around sunset for downeast Maine, if the storm lasts another 6 hours, the upper Midwest may see northern lights around sunset as well

Some areas of clearing around sunset on the East Coast - might be able to see Aurora
Some areas of clearing around sunset on the East Coast – might be able to see Aurora

UPDATE: 04:00UTC December 31

The CME arrived! It arrived shortly after the previous update. so far Solar wind speed have been in the 425-475 km/s range, which is fairly low for a CME. The Bz component of the magnetic field has switched a couple times between negative and positive. There was a 45 minute period of sustained south orientation that pushed the KP to 5, but it has since subsided. It’s likely there will be more periods of high KP over the coming hours. Here’s is what the ACE data looked at at the moment the CME first arrived:

Bt Measured at the ACE satellite when the interplanetary shock hit.
Bt Measured at the ACE satellite when the interplanetary shock hit.

There are a lot of articles being posted about the ongoing storm. NLN has started a live updated post that contains links to those articles.

UPDATE: 00:00UTC December 31
8 hours after the official forecasted arrival of the CME, it hasn’t arrived yet. Not to worry, it is still on it’s way.

As noted in the original post, this means that it’s more likely the NASA Enlil model is closer to correct than the SWPC model. That means a wider, slower moving CME. It will bring a slightly weaker storm with slower solar wind speeds, but it also should make for a longer duration storm. This will give aurora hunters on the west coast and in Australia/NewZealand a better chance. If the storm lasts long enough, some new year’s revelers in Europe, Iceland and the East coast of the United states could be ringing in the new year under a dancing sky. Here’s the updated forecast graphic from SWPC:

Updated SWPC forecast shows G3 aurora extended to 12/31 and G1 into the new year
Updated SWPC forecast shows G3 aurora extended to 12/31 and G1 into the new year

UPDATE: 03:00UTC December 30

As the watch period begins, SWPC has updated the storm watch to G3. This means that KP=7+ is expected. There have only been a couple storms of this magnitude during this solar cycle. The timing of the start of the storm has stayed the same, roughly around 3pm UTC (10:00am EST). The duration prediction was extended to 15 hours, which should give north american viewers a better chance of seeing northern lights.

Three-day auroracast featuring day 1 with G3 storming predicted.
Three-day auroracast featuring day 1 with G3 storming predicted.

EPAM will continue to rise as the CME approaches Earth. Once the shock hits, EPAM should spike up, then start to decline. When the CME arrives at the ACE satellite, watch the Bz, if it is negative, this storm could be really good. If the Bz stays positive, this storm could top out at just KP=5, so keep your fingers crossed.

3-day EPAM graph shows a rise in electrons and protons measured at ACE as the CME approaches
3-day EPAM graph shows a rise in electrons and protons measured at ACE as the CME approaches

Also keep an eye on the arrival time of the CME. The later it arrives the weaker the storm will be, but the longer it will last (because the CME was moving slower than expected.

Original Post: 06:00UTC December 29

The Earth-directed Coronal Mass Ejection (CME) from Monday’s long duration solar flare is predicted to arrive on December 20. The Space Weather Prediction Center has issued a G2 geomagnetic storm watch for Wednesday and a G1 watch for Thursday. Aurora hunters with clear skies should get a nice show. For clouded-in skywatchers, keep an eye on the NLN Twitter feed for images of the northern lights.

Monday’s M1.86 originated from active region 2473 (Beta-Delta), the same region that produced a couple M-class flares as it rotated onto the disk about a week ago. The region was beyond the center of the Earth-strike zone during for this eruption, but was close enough for a nice CME signature on LASCO. In the CACTus image below, see the partial halo ejection:

Animated GIF from CACTus shows the partial halo CME signature from the 12/28 solar flare
Animated GIF from CACTus shows the partial halo CME signature from the 12/28 solar flare

The two main models that are used to predict the timelines of the storm are in disagreement. The official forecast model shows a stronger faster moving storm arriving around noon eastern time and lasting 6-12 hours. The NASA model shows a slower moving storm, that would be weaker, arrive later and last longer. It will be exciting to see which model proves correct. Here is the current predicted timeline for the KP according to the SWPC models.

Days Two and Three of the official max KP forecast from SWPC
Days Two and Three of the official max KP forecast from SWPC

NLN will continue to post updates on the twitter feed as this storm progresses.

Happy Hunting!

New Years Eve Aurora Predicted – worldwide press coverage

Northern Lights Now – The internet is abuzz with articles and blog posts about the predicted G3 aurora display for tonight and tomorrow night. It’s no surprise, a G3 storm is very strong and could mean aurora are visible as far south as Salt Lake City, UT, London, and Warsaw and as far north as Melbourne, Australia and Wellington NZ.

Here’s a running list of articles we have found talking about this ongoing storm:

Article from the Pacific Northwest in the United States:

There are several articles from this region as it is one of the few that has clear skies for the first night of the storm:

From The Seattle Times
Northern Lights may be visible in Seattle area by Jack Broom
“The best chance to see the effect may be early in the evening, before the fog sets in.”

From MyNorthwest.com
Could Seattle Catch a Glimpse of the Northern Lights” by Richard D. Oxley
“With all the city lights it would be difficult or impossible to see. You would need to get out of town,” said Terry Onsager, a physicist with the National Oceanic and Atmospheric Administration’s Space Weather Prediction Center.”

From Komonews.com
Northern Lights may be visible as 2015 comes to an end by Scott Sistek
“But if the storm is late and/or the fog is early, we can cross fingers that the storm lingers long enough to bring the aurora back around on Thursday night. Wouldn’t that be a sight: New Year’s Eve auroras! ”

National US and International news:

From NBCBayArea (San Francisco):
Northern Lights: Forget Fireworks, New Year’s Solar Eruption Might Be Visible in Bay Area
“In the Bay Area, skies should be clear, giving stargazers who stay up late a shot at seeing the Aurora borealis: The time to look is early Thursday morning between 2 a.m. and 6 a.m., scientists say.”

From accuweather.com Strong solar storm may bring chance to view northern lights to midwestern, northwestern US Wednesday night
“Those in the Ohio Valley and Northeast will be out of luck regardless of whether the aurora develops or not due to widespread clouds”

From the Telegraph: Solar flare hints at New Year light show
“On Monday, a powerful M1.9 class solar flare erupted from the Sun, spewing out huge amounts of charged particles. They began hitting the Earth’s atmosphere early on Wednesday morning, and the effects are expected to continue being felt into New Year’s Eve. ”

From CBC Canada:
Aurora borealis could illuminate New Year’s Eve sky across Canada
“People who want to increase their chances of seeing the lights should try to get away from light pollution, look north, and hope for clear skies.”

From The Local: Sweeden
Northern lights ‘eruption’ set to dazzle Sweden
“Although even if cloud cover does obscure the lights this week, patience will be rewarded, according to norrskensverige.com, a blog for Swedish northern lights enthusiasts.”

From the International Business Times:
New Year’s Eve Aurora Could Be Visible After Coronal Mass Ejection Hits Earth
“The CME interacts with Earth’s magnetic field, which could affect power systems, GPS and spacecraft, cause radio blackouts and create strong aurora displays. G3 geomagnetic storming could affect satellite and low-frequency radio navigation, according to the SWPC. The aurora may be visible as far south as Illinois and Oregon.”