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Abstract Subauroral emissions known as STEVEs (Strong Thermal Emission Velocity Enhancements) are sometimes accompanied by green arcs containing magnetic field‐aligned “picket fence” structures. In a newly published spectrum of a green picket fence arc Gillies et al. (2019, https://doi.org/10.1029/2019GL083272 ) showed that the visible emission in such arcs is mostly OI 557.7 nm with minimal N 2 + 1N. This finding is consistent with the color ratios found in digital camera photos (Mende Gillies et al., 2019, https://doi.org/10.1029/2019GL083272 ).
Mende et al. (Thu,) studied this question.
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