Brad Goldpaint

Photographer Brad Goldpaint captured this view of the northern lights over Crater Lake, Ore., early Sunday.

A double-burst of solar particles sparked auroral lights over the weekend, as expected — but at least in some parts of the world, the colors were not what you'd expect. Instead of the typical greenish glow, observers reported seeing reds, pinks, violets and even blues.

"It's been many years since I saw the blue in our auroras, but Saturday night they came back," John Welling reported in a note accompanying the photo he posted to SpaceWeather.com.

Pinks, reds and blues also dominated the scene captured on camera early Sunday by Brad Goldpaint, from a vantage point above Oregon's Crater Lake. In an email, Goldpaint told me the opportunity came about "by pure coincidence."

"Capturing this famous light show had been a dream of mine for several years, but I could not have imagined the lights showing up in my own backyard!" Goldpaint wrote. "After setting up near the Rim Village Visitor Center lookout area, I began to notice a faint band of moving light slowly making its way from behind the Watchman Tower, around 1:30 a.m. My camera began picking up bright pink bursts of light towards the north, with what also looked like unfamiliar vertical bands of light stretching upwards from the horizon. I quickly changed my camera’s white balance to confirm I was not picking up some random light pollution, or hallucinating in my drowsy state. Following additional exposures, I came up with the same amazing results. The magical shifting scene continued until sunrise, and like most days in the wilderness, I was awed and humbled by true nature personified."

The photo now graces Brad's portfolio at GoldpaintPhotography.com.

The colors of the aurora depend on the wavelength of the light emitted when fast-moving, electrically charged particles from the sun interact with different types of atoms and ions in Earth's upper atmosphere. If the particles hit mostly oxygen atoms, the light will be in the greenish-yellowish-reddish range. Collisions with nitrogen atoms produce the blue, purple and deep red hues.

The altitude of the auroral glow also affects the color: At altitudes between 60 and 120 miles (100 and 200 kilometers), the oxygen emissions tend toward the green side of the spectrum. At higher altitudes, you'll see more red. Blend all those colors, and you get a beautiful, wide-ranging palette.

The "Causes of Color" website provides a fuller spectrum of information. And speaking of a fuller spectrum, here are more of the weekend's colors, plus a bonus video:

Randy Halverson

Pink and purple rays highlight this picture of the aurora as seen from South Dakota's Black Hills by Randy Halverson. Technical details: Canon 5D Mark III, Canon 24-70, f/2.8 ISO 3200, 20-second exposure. For more of Halverson's images, click on over to Dakotalapse.com.

Stephen Voss

Stephen Voss snapped pictures of the southern lights from a spot near Invercargill in the south of New Zealand. "A dull arc hung around for a couple of hours before suddenly exploding with a mixture of rays and curtains," Voss told SpaceWeather.com. Check out Voss' gallery at Deep South Astrophotography.

Scott Lowther

Scott Lowther snapped this panoramic picture of Saturday night's auroral display as seen from Tremonton, Utah. The shot was taken with a Nikon D5000 and a 55mm lens at f/1.4 with 6-second exposures. For more of Lowther's photos, check out the Art by Earthlings website.

Shawn Malone / LakeSuperiorPhoto.com

Shawn Malone snapped this picture before dawn on Sunday morning from Marquette, Mich. "Got to witness the tail end of aurora activity as the skies cleared about 15-20 minutes before the sunrise light moved in," Malone told SpaceWeather.com. "Photos taken between 3:50 a.m. and 4:15 a.m. Bright aurora, with rays of light overhead, almost forming a corona. Beautiful purples came through on the exposures, but only light visible to the eye, as is typical with auroras right before sunrise." Check out LakeSuperiorPhoto.com for more of Malone's work.

More auroral glories:

• Northern lights blaze again on video
• Farewell to the northern lights
• Northern lights make for must-see TV
• Southern exposure for auroral lights
• Slideshow: The best of the northern lights
• Cosmic Log's auroral archive

Alan Boyle is msnbc.com's science editor. Connect with the Cosmic Log community by "liking" the log's Facebook page, following @b0yle on Twitter and adding the Cosmic Log page to your Google+ presence. You can also check out "The Case for Pluto," my book about the controversial dwarf planet and the search for new worlds.

Skywatchers as far south as Colorado and Kansas witnessed a quick flare-up of the northern lights this week, which called to mind the brilliant, beautiful displays that northerners saw earlier this year. The skies have settled down — for now — but developments on the sun suggest we could be in for another wave of auroral glories.

The greenish glow over Lake Superior, recorded from Michigan's Upper Peninsula at 2 o'clock in the morning by Shawn Malone of LakeSuperiorPhoto.com, was impressive enough to make NBC's "Nightly News" on Tuesday night. In an email, Malone told me that the "intensity caught me off guard."

"Check out the passing freighter for scale," Malone said in his comments on the Vimeo version of the video. "What a view those sailors must have had!"

Mark Riutta had a similar view from Copper Harbor Cabins on the Upper Peninsula, as the time-lapse video below illustrates. Riutta told me over the phone that he and his girlfriend were getting the cabins ready for the summer season and were surprised by how bright Tuesday's display turned out to be. "We were just about to go to sleep, when we looked out and wondered, 'Why is it so light out there?' he said.

SpaceWeather.com provides a roundup of auroral images from a dozen U.S. states, mostly in the Midwest but also including the top state for the northern lights, Alaska. And speaking of Alaska, here's an unconventional view of the aurora that was recorded from a height of 90,000 feet during "Project Aether: Aurora," a scientific experiment that took place this month:

Project Aether, led by University of Houston physicist Ben Longmier, sent up almost two dozen weather balloons laden with high-definition cameras and scientific instruments to monitor auroral activity near Fairbanks. Most of the payloads have been recovered, but the student researchers are still on the lookout for a few that haven't yet been located. If you happen to be in the Fairbanks area and find one of them, you could win a prize.

More prizes could be in store for aurora-watchers: The National Oceanic and Atmospheric Administration's Space Weather Prediction Center reports that we're currently in the midst of a minor geomagnetic storm, which could spark another wave of northern lights. What's more, an active region of the sun known as AR1465 has developed the type of magnetic field that's associated with stronger X-class outbursts.

To keep tabs on the solar weather report, check in with SpaceWeather.com as well as the Space Weather Prediction Center's website and Facebook page. And to watch some classic auroral videos, check out the gallery offered by NASA's Gateway to Astronaut Photography of Earth.

More auroral glories:

• Awesome auroras on Uranus ... and Earth
• Farewell to the northern lights
• Northern lights make for must-see TV
• Southern exposure for auroral lights
• Slideshow: The best of the northern lights
• Cosmic Log's auroral archive

Alan Boyle is msnbc.com's science editor. Connect with the Cosmic Log community by "liking" the log's Facebook page, following @b0yle on Twitter or adding Cosmic Log's Google+ page to your circle. You can also check out "The Case for Pluto,"my book about the controversial dwarf planet and the search for other worlds.

The aurora's glow makes for thrilling photographs, but let's face it: The shimmer of the northern lights is a big part of the appeal. Here are three time-lapse video views looking at the northern lights from above and below, plus still-photo highlights from the past day or two.

The International Space Station's view of the green and red aurora was recorded back on Jan. 22, but the clip is part of a batch of seven night-flight videos released on Thursday via the Gateway to Astronaut Photography of Earth. The shots were snapped as the station soared from the Pacific Ocean, west of San Francisco, northeast across the United States toward Saskatchewan in Canada. The camera is looking northward, and to my mind, the presence of the station's solar panels and robotic arm in the foreground is a plus, not a minus. For a sharper version, go directly to the high-resolution QuickTime video.

The aurora most commonly takes on a greenish hue, but when electrically charged particles from the sun interact with atomic oxygen at higher altitudes — say, up to 200 miles — the glow turns red.

The past week has been a godsend for aurora-watchers, thanks to a series of outbursts from an active region on the sun, but now the solar storms have settled down. Observers caught the tail end of the heightened activity on Thursday night in regions of Scandinavia, Iceland, Scotland, Greenland and North America, as well as Australia, New Zealand and Antarctica in the south. Check SpaceWeather.com as well as the National Oceanic and Atmospheric Administration's Space Weather Prediction Center for updates. And check out this album of videos and photos from all over:

Iurie Belegurschi

Iceland's Iurie Belegurschi offers this stunning picture of the aurora with the Venus-Jupiter conjunction shining in the sky, off to the right. For more of Belegurschi's photography, check out his Facebook page.

Andrei Penescu

Andrei Penescu captured this view of the northern lights on March 15 from Kangerlussuaq, Greenland. "Tonight was very special because it was the first time I've seen the sky full of red auroras. ... It was the best aurora show I've ever seen!" Penescu told SpaceWeather.com. Check out the gallery at SpaceWeather.com.

Minoru Yoneto

A red and purple auroral display lights up the skies over Queensland, New Zealand, in this March 16 view from Minoru Yoneto. "The auroras danced until sunrise," Yoneto told SpaceWeather.com. Check out the imagery on SpaceWeather.com.

More auroral glories:

• Southern exposure for auroral lights
• Sky lights go wild, north and south
• Solar storm lights up northern skies
• Slideshow: The best of the northern lights
• Cosmic Log's auroral archive

Alan Boyle is msnbc.com's science editor. Connect with the Cosmic Log community by "liking" the log's Facebook page, following @b0yle on Twitter or adding Cosmic Log's Google+ page to your circle. You can also check out "The Case for Pluto," my book about the controversial dwarf planet and the search for other worlds.

Andrei Penescu

The northern lights shimmer over Kangerlussuaq in Greenland on Feb. 27. "Out for about two hours in -36 degrees Celsius until my fingers gave up, but what a nice show!" Andrei Penescu told SpaceWeather.com. "I didn't get out too far from the town, and had a lot of light pollution, but the aurora was very bright."

A "crack" in Earth's magnetic field has opened the way for yet another thrilling display of the northern lights near the top of the world.

We're in the middle of an upswing in the sun's 11-year activity cycle, leading up to an expected peak in 2013. If solar storms get too intense, there could be a heightened risk of outages in satellite communication and electrical grids. But fortunately, the only significant effects from the solar outbursts so far have come in the form of heightened auroras, occasionally ranging as far south as Nebraska.

Auroras arise due to the interaction of Earth's magnetosphere with electrically charged particles streaming from the sun. That interaction energizes atmospheric oxygen and nitrogen in the ionosphere, causing ripples of greenish and reddish light between 60 and 200 miles up in Earth's polar regions.

SpaceWeather.com's Tony Phillips reports that the interplanetary magnetic field tipped south this week and opened a crack in our planet's magnetic shield to fuel a minor G1-class geomagnetic storm. The Space Weather Prediction Center said the storm was sparked by particles sent out from the sun during an eruption last Friday.

You can see the atmospheric physics at work in the picture above, captured by Andrei Penescu in Kangerlussuaq, Greenland, on Feb. 27. Fittingly, Kangerlussuaq is home to the Sondrestrom Upper Atmospheric Research Facility, a project that studies the aurora and other atmospheric phenomena.

Here are a few other photos from this week's auroral displays, plus two video extras. One is "Temporal Distortion," a time-lapse tribute to the aurora and other wonders of the night sky by Dakotalapse photographer Randy Halverson. It includes some of the auroral imagery we featured back in October, and features original music by Bear McCreary, the award-winning composer for TV shows such as "Walking Dead" and "Battlestar Galactica."

The other is David Peterson's compilation of time-lapse videos captured by astronauts on the International Space Station, including some primo views of the aurora from above. Here's what NASA's Mike Fossum, a former space station resident, had to say about the clip: "This is the best video I've seen from photos we took on ISS! Stunning!!"

Can't argue with that...

Aaro Kukkohovi

Finland's Aaro Kukkohovi saw an aurora of a different color burst forth on Feb. 27 in the skies over Lumijoki. "I've never seen anything close to this," Kukkohovi told SpaceWeather.com. "What a fantastic burst of energy - like something blew a hole into Earth's magnetic field just above us." For more from Kukkohovi, check out the gallery at the LumiSoft website.

AuroraMAX / CSA

The AuroraMAX wide-angle camera snapped this picture of the northern lights over Yellowknife in Canada's Northwest Territories early Feb. 27. For more from AuroraMAX, check out the project's website and Twitpic gallery.

More auroral glories:

• Rocket flies into the northern lights
• Northern lights appear to wash over ship in Norway
• The sun sends Earth a valentine
• Aurora extravaganza glows in space
• Planet looks back at the northern lights
• Auroras spark awe across the north
• Solar weather stirs up super sights
• Northern lights go way, way south
• Speed through Lapland's lights
• Beautiful blasts from solar storms
• Get a video view of Canada's aurora
• Slideshow: The best of the northern lights
• Cosmic Log's auroral archive

Michael Ericsson Visuals

An auroral display dominates the sky over Tibbitt Lake in Canada's Northwest Territories on the night of Aug. 6.

Last week's solar storms sparked auroral displays as far south as Colorado and Nebraska over the weekend, but the best viewing was available way up north — for example, Canada's Northwest Territories, where photographer Michael Ericsson captured this amazing picture.

"It's one of the better spots in the world to see the aurora," Ericsson told me over the phone today from Yellowknife. He says you can see the northern lights on pretty much any clear night, "if you're out for enough hours."

Ericsson knew that the weekend would be prime time for aurora-viewing, thanks to a series of solar eruptions that started on Aug. 2. The outbursts didn't cause significant disruptions in satellite operations, communications or power grids, as some had feared, but they put on a heck of a show over Tibbitt Lake, where Ericsson set up his camera equipment. He put together a time-lapse series of the auroral display — shot at three-second intervals with a Nikon D3s at ISO 6400 — to produce this must-see video. (Make sure you're seeing this in PhotoBlog's wide-screen format.)

Ericsson says he's seen brighter auroral displays, particularly during the long northern winter, but this one was special nevertheless. "It's really neat getting a summer aurora, because in Yellowknife we're still not getting complete darkness," he told me, "and that's part of the reason why I didn't see it as the most intense aurora."

He and a couple of friends traveled to Canada's Nunavut territory in April to document the northern lights there and also gather some oral history from the local elders. Here's yet another must-see video that features the sights of the lights and the sounds of Alice Ayalik, telling tales of the aurora in her native tongue:

Check out Ericsson's Vimeo website as well as his blog and MichaelEricsson.com for much, much more from the Great White North.

Ericsson wasn't the only one to catch last weekend's show. Yuichi Takasaka's time-lapse video offers a subtler look at the aurora, punctuated by passing clouds and airplanes. Takasaka specializes in views of the night sky, focusing on the northern lights as well as noctilucent clouds and the International Space Station. This view of the Aug. 5 aurora was captured from Burton Campground in British Columbia:    

Check out Takasaka's Blue Moon Promotions website for more.

SpaceWeather.com offers a whole gallery of photos and videos featuring this month's auroral displays, and the show may not be over just yet: Just today, the most powerful flare in years blasted out from the sun. The flare was not directed toward Earth (which is a good thing), but it still might spark a fresh wave of auroras later this week. To learn more about how auroras arise, and how best to see them, check out this FAQ page from the University of Alaska's Geophysical Institute.

More about auroras:

• Southern lights look sweeter from space
• Weird glow from Earth's auroras explained
• A mystery glows on Saturn
• All about auroras on msnbc.com

Connect with the Cosmic Log community by "liking" the log's Facebook page or following @b0yle on Twitter. You can also add me to your Google+ circle, and check out "The Case for Pluto," my book about the controversial dwarf planet and the search for new worlds.