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Riled Up is a journal of science, the environment, exploration, new technology, and related commentary.  Contributors include scientists, explorers, engineers, and others who provide perspectives and context not typically offered in general news circulation.  For interested readers, additional resources are included.

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Greenland's green auroras

When the Vikings reached Greenland in the ~9th Century they must have been looking for color inspiration in naming the ice-bound island. The Northern Lights of the night sky may have helped them. Research on auroras has observed strikingly beautiful green displays there. [caption id="attachment_6806" align="aligncenter" width="1400" caption="Greenland aurora (credit: Staryearth.com)"][/caption] WHB
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Sun pillar

The light in northern latitudes can create some beautiful visual displays. Think of auroras that are produced by solar particles hitting the upper atmosphere. Sun Pillars are another example formed by ice crystals in high level clouds that refract sunlight in a vertical column. Here's an example from northern Canada: [caption id="attachment_6692" align="aligncenter" width="900" caption="Sun pillar in northern Canada (credit: NASA)"][/caption] They are most commonly observed in the ...
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