STEVE - Magneto-thermal Phenomena First Observed by Aurora Photographers

This is a bit short on science, but interesting: see New science in plain sight: Citizen scientists lead to the discovery of optical structure in the upper atmosphere:

A glowing ribbon of purple light running east-west in the night sky has recently been observed by citizen scientists. This narrow, subauroral, visible structure, distinct from the traditional auroral oval, was largely undocumented in the scientific literature and little was known about its formation. Amateur photo sequences showed colors distinctly different from common types of aurora and occasionally indicated magnetic field–aligned substructures. Observations from the Swarm satellite as it crossed the arc have revealed an unusual level of electron temperature enhancement and density depletion, along with a strong westward ion flow, indicating that a pronounced subauroral ion drift (SAID) is associated with this structure. ... 

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Anton Petrov on a report: Satellite magnetic data reveal interannual waves in Earth’s core.


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