First-ever hyperspectral images of Earth's auroras
Hoping to expand our understanding of auroras and other fleeting atmospheric events, a team of space-weather researchers designed and built NORUSCA II, a new camera with unprecedented capabilities that can simultaneously image multiple spectral bands, in essence different wavelengths or colors, of light. The camera was tested at the Kjell Henriksen Observatory (KHO) in Svalbard, Norway, where it produced the first-ever hyperspectral images of auroras -- commonly referred to as "the Northern (or Southern) Lights" -- and may already have revealed a previously unknown atmospheric phenomenon. Details on the camera and the results from its first images were published November 29 in the Optical Society's (OSA) open-access journal Optics Express.
Auroras, nature's celestial fireworks, are created when charged particles from the Sun penetrate Earth's magnetic field. These shimmering displays in the night sky reveal important information about the Earth-Sun system and the way our planet responds to powerful solar storms. Current-generation cameras, however, are simply light buckets -- meaning they collect all the light together into one image -- and lack the ability to separately capture and analyze multiple slivers of the visible spectrum. That means if researchers want to study auroras by looking at specific bands or a small portion of the spectrum they would have to use a series of filters to block out the unwanted wavelengths.
The new NORUSCA II hyperspectral camera achieves the same result without any moving parts, using its advanced optics to switch among all of its 41 separate optical bands in a matter of microseconds, orders of magnitude faster than an ordinary camera. This opens up new possibilities for discovery by combining specific bands of the same ethereal phenomenon into one image, revealing previously hidden details.
"A standard filter wheel camera that typically uses six interference filters will not be able to spin the wheel fast enough compared to the NORUSCA II camera," said Fred Sigernes of the University Centre in Svalbard (UNIS), Norway. "This makes the new hyperspectral capability particularly useful for spectroscopy, because it can detect specific atmospheric constituents by their unique fingerprint, or wavelengths, in the light they emit."
These spectral signatures can then reveal subtle changes in atmospheric behavior, such as the ionization of gases during auroras. This form of multispectral imaging also will enable scientists to better classify auroras from background sky emissions and study the way they cluster in the atmosphere.
A New Phenomenon
On Jan. 24, 2012, during the inaugural research campaign of NORUSCA II, a major solar flare jettisoned a burst of high-energy particles known as a Coronal Mass Ejection (CME). The CME eventually slammed into Earth's magnetic field, producing magnificent auroras and a chance to fully test the new camera.
The researchers were able to image the aurora in unprecedented clarity through a layer of low altitude clouds, which would have thwarted earlier-generation instruments (see Image 1). The camera also revealed something unexpected -- a very faint wave pattern of unknown origin in the lower atmosphere (see Image 2). The wave pattern resembles "airglow" -- the natural emission of light by Earth's atmosphere. Airglow can be produced by a variety of known sources, including cosmic rays striking the upper atmosphere and chemical reactions. Its concurrent appearance with the aurora suggests that it may also be caused by a previously unrecognized source.
"After the January CME, we think we saw an auroral-generated wave interaction with airglow," said Sigernes. This would be an entirely new phenomenon and if confirmed, would be the first time airglow has been associated with auroras.
"Our new all-sky camera opens up new frontiers of discovery and will help in the detection of auroras and the understanding of how our Sun impacts the atmosphere here on Earth. Additional development and commissioning will also hopefully verify our intriguing first results," concludes Sigernes.
Source: Optical Society of America
- Using digital SLRs to measure the height of Northern LightsFri, 6 Sep 2013, 23:02:31 EDT
- Colliding auroras produce an explosion of lightThu, 17 Dec 2009, 14:49:23 EST
- Colliding auroras produce an explosion of light, UCLA scientists reportFri, 18 Dec 2009, 9:24:27 EST
- AGU: Uranus auroras glimpsed from EarthFri, 13 Apr 2012, 13:22:22 EDT
- Exoplanet aurora: An out-of-this-world sightThu, 21 Jul 2011, 14:36:38 EDT
- First-ever hyperspectral images of Earth's auroras: New camera provides tantalizing clues of new atmospheric phenomenonfrom Science DailyThu, 29 Nov 2012, 12:01:41 EST
- First-ever hyperspectral images of Earth's aurorasfrom PhysorgThu, 29 Nov 2012, 12:00:40 EST
Latest Science NewsletterGet the latest and most popular science news articles of the week in your Inbox! It's free!
Learn more about
Check out our next project, Biology.Net
From other science news sites
Popular science news articles
- Mysteries of Earth's radiation belts uncovered by NASA twin spacecraft
- Fledgling supernova remnant reveals neutron star's secrets
- Sea level rise and shoreline changes are lead influences on floods from tropical cyclones
- CU-Boulder-led team finds first evidence of primates regularly sleeping in caves
- New fossil species found in Mozambique reveals new data on ancient mammal relatives
- Stanford study suggests why, in some species, mere presence of males shortens females' lifespan
- 'Spooky action' builds a wormhole between 'entangled' quantum particles
- Fruit flies with better sex lives live longer
- The mystery of neutron stars heats up
- New report calls for attention to abrupt impacts from climate change