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A NEW TYPE OF AURORA--"THE DUNES": A new type of aurora is rippling across Arctic skies. Citizen scientists who discovered it nicknamed it "The Dunes" because of its resemblance to desert sand dunes. A paper published in the Jan. 28th issue of AGU Advances describes the new form and the unexpected physics that causes it.
Above: Aurora dunes over Latilla, Finland, on Oct. 7, 2018. Credit: Pirjo Koski. [more]
Dune-shaped auroras form in a narrow altitude range 80 km to 120 km above Earth's surface. Turns out, this is an extremely hard-to-study layer of Earth's atmosphere. It's too high for weather balloons, and too low for rockets.
"Due to the difficulties in measuring atmospheric phenomena between 80 and 120 km, we sometimes call this region 'the ignorosphere'," says Minna Palmroth, Professor of Computational Space Physics at the University of Helsinki and the lead author of the study.
Sky watchers in the Arctic have been seeing Dunes for years without understanding what they were. A breakthrough came on Oct. 7, 2018, when multiple groups photographed the dunes from widely separated locations in Finland. Maxime Grandin, a postdoctoral researcher in Palmroth's team, analyzed the images, using triangulation techniques to decipher the Dune's geometry.
Conclusion: Dunes are located ~100 km high--smack-dab in the middle of the ignorosphere--and have a pure, monochromatic wavelength of about 45 km.
Above: An artists' concept of a mesospheric bore trapped in a high-altitude waveguide. [more]
The research team believes the Dunes are a "mesospheric bore"--a type of atmospheric gravity wave that springs up from the surface below and gets caught in a thermal waveguide ~100 km high. When solar wind particles rain down on the bore, they illuminate its rippling structure.
The discovery of Dunes may allow researchers to study the ignorosphere as never before. Monitoring Dunes can reveal previously hidden waves and waveguides at the boundary between Earth and space. Aurora photographers, have you seen a Dune? Submit your photos here.
Celeste has worked as a contractor for Homeland Security and FEMA. Her training and experiences include the infamous day of 911, flood and earthquake operations, mass casualty exercises, and numerous other operations. Celeste is FEMA certified and has completed the Professional Development Emergency Management Series.
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Celeste grew up in military & governmental home with her father working for the Naval Warfare Center, and later as Assistant Director for Public Lands and Natural Resources, in both Washington State and California.
Celeste also has training and expertise in small agricultural lobbying, Integrative/Functional Medicine, asymmetrical and symmetrical warfare, and Organic Farming.
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