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Overnight Aurora Sets Sky On Fire, More Possible Tonight

At around 10 p.m. last night, the northern sky was alive with colorful auroral patches and arcs. Details: 15mm lens at f/2.8, ISO 800 and 25 second exposure. Credit: Bob King

At around 10 p.m. last night, the northern sky was alive with colorful auroral patches and arcs. Details: 15mm lens at f/2.8, ISO 800 and 25 second exposure. Credit: Bob King

I’m writing this at 1:30 a.m. running on what’s powering the sky over northern Minnesota right now – auroral energy. Even at this hour, rays are still sprouting in the southern sky and the entire north is milky blue-white with aurora borealis. Frankly, it’s almost impossible to resist going out again for another look.

Now updated with additional images.

An erupting filament and sharp, southward turn in the interplanetary magnetic field (IMF) was responsible for last night's northern lights show. This image was taken with the Solar and Heliospheric Observatory sun-blocking coronagraph in progress on Sept. 30. Credit: NASA/ESA

An erupting filament and sharp, southward dip in the interplanetary magnetic field (IMF) was responsible for last night’s northern lights show. This image was taken with the Solar and Heliospheric Observatory’s sun-blocking coronagraph on Sept. 30. Credit: NASA/ESA

The arrival of a powerful solar wind in excess of 375 miles per second (600 km/second) from a coronal mass ejection shocked the Earth’s magnetic sheath last night beginning around 9 p.m. CDT. The sun’s magnetic field, embedded in the wind, pointed sharply southward, allowing eager electrons and protons to worm their way past our magnetic defenses and excite the atoms in the upper atmosphere to glow. Voila! Northern lights.

A classic quiet start to Tuesday night's northern lights - a low green arc below the Big Dipper topped by a very faint red border. Credit: Bob King

A classic quiet start to Tuesday night’s northern lights – a low green arc below the Big Dipper topped by a very faint red border. Credit: Bob King

Sure, it started innocently enough. A little glow low in the northern sky. But within half an hour the aurora had intensified into a dense bar of light so and green and bright it cast shadows. This bar or swath grew and grew like some atomic amoeba until it swelled beyond the zenith into the southern sky. Meanwhile, an isolated patch of aurora glowed like an green ember beneath the Pleiades in the northeastern sky. The camera captured its eerie appearance as well as spectacular curtains of red aurora dancing above the dipper-shaped cluster.

A single patch of aurora glows beneath the Pleiades star cluster at center. Beautiful red rays as seen in the time exposure were only faintly visible with the naked eye. Credit: Bob King

A single patch of aurora glows beneath the Pleiades star cluster at center. Beautiful red rays as seen in the time exposure were only faintly visible with the naked eye. Credit: Bob King

Soft patches, oval glows and multiple arcs lit up the north, east and west, but in the first two hours of the display I never saw a ray or feature with any definition. The camera recorded a few but all was diffuse and pillowy to the eye. Rays finally made their appearance later – after midnight and later – when they massed and surged to the zenith and beyond.

A thick wall of green aurora surges upward in the northern sky headed for the zenith. Credit: Bob King

Looks a little scary. A thick wall of green aurora surges upward in the northern sky headed for the zenith. Credit: Bob King

Then came the flickering, flame-like patches and snaky shapes writhing lifelike across the constellation Pegasus during the phase called the coronal aurora. That’s when all the curtains and rays gather around the local magnetic zenith. As they flicker and flame, their shapes transform into eagle wings and snakes wriggling across the stars.

A large comet-like auroral form topped with red rays took up residence in the southeastern sky in Cetus around 10:30 p.m. last night. Credit: Bob King

A large comet-like auroral form accented with red rays took up residence in the southeastern sky in Cetus from about 10:15 until 11 p.m. last night. around 10:30 p.m. Credit: Bob King

Funny, the space weather forecast called for quiet conditions last night and for the next two nights. But the eruption of a large filament, a tubelike region of dense hydrogen gas held aloft in the sun’s atmosphere by magnetic fields, sent a bundle of subatomic joy in Earth’s direction a bit earlier than expected. More auroras are possible tonight and tomorrow night as the effect of the shock wave continues. Despite the U.S. government shutdown, the Space Weather Prediction Center remains open.

There are so many ways to appreciate the aurora but my favorite is simply to stand there dumbfounded and try to take it all in. Few phenomena in nature are more deeply moving.

Opposite Cetus in the Aquila Milky Way, a huge ghostly patch resembling breath on a mirror lingered for some 20 minutes before fading away. Credit: Bob King

Opposite Cetus in the Aquila Milky Way, a huge ghostly patch resembling breath on a mirror lingered for some 20 minutes before fading away. Credit: Bob King

This comet-like wisp next to Alpha Andromeda east of the Square of Pegasus appeared to flutter in the wind as it constantly dimmed, brightened and shape-shifted. Credit: Bob King

This comet-like wisp next to Alpha Andromeda east of the Square of Pegasus appeared to flutter in the wind as it constantly dimmed, brightened and shape-shifted. Click photo to learn more about when to expect the next auroral display. Credit: Bob King

Finally - a mighty show of rays around 3 a.m. this morning. What you don't see in the photo  are the rhythmic pulsations fluttering through the entire display, a phenomenon known as "flaming". Credit: Bob King

Finally – a mighty show of rays around 3 a.m. this morning. What you don’t see in the photo are the rhythmic pulsations fluttering through the entire display, a phenomenon known as “flaming”. Credit: Bob King

 

Magnetic and auroral activity indicators shot up to high levels last night and this morning. Left image from the POES satellite shows the extent of the auroral oval shortly after midnight CDT. At right, the Kp index shot up to 6 - a G2 or moderate geomagnetic storm - by the early morning. Click to see the current oval. Credit: NOAA

Magnetic and auroral activity indicators shot up to high levels last night and this morning. Left image from the POES satellite shows the extent of the auroral oval shortly after midnight CDT. At right, the Kp index shot up to 6 – a G2 or moderate geomagnetic storm – by the early morning. Click to see the current oval. Credit: NOAA

UPDATE: Other astrophotographers in the US also were able to capture some aurora images. John Chumack, whose images we frequently feature here on UT got this shot early on the morning of October 2:

Aurora Borealis, 'The Northern Lights, as seen near Dayton, Ohio on October 2, 2013. Credit and copyright: John Chumack/Galactic Images.

Aurora Borealis, ‘The Northern Lights, as seen near Dayton, Ohio on October 2, 2013. Credit and copyright: John Chumack/Galactic Images.

And Alan Dyer in Canada got this amazing “fiery” shot:

A red and green aurora, from southern Alberta, Canada on Oct 1, 2013. Credit and copyright: Alan Dyer/Amazing Sky Photography.

A red and green aurora, from southern Alberta, Canada on Oct 1, 2013. Credit and copyright: Alan Dyer/Amazing Sky Photography.

This timelapse from Arthur, Ontario was shot on Oct. 2 as well:

About 

I'm a long-time amateur astronomer and member of the American Association of Variable Star Observers (AAVSO). My observing passions include everything from auroras to Z Cam stars. Every day the universe offers up something both beautiful and thought-provoking. I also write a daily astronomy blog called Astro Bob.

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