Abstract
Early studies of auroral radar echoes by Unwin1,2 showed the existence of a particular class of ‘long discrete’ echoes, distinguished as being weak and relatively long-lasting (1–60 min). The backscatter usually consists of several narrow (∼20 km) bands which drift slowly in latitude, and the height of the backscattering region appears not to exceed 100 km. Here, we report on observations of this type of radar aurora made during the past few years with the Scandinavian Twin Auroral Radar Experiment (STARE). Whereas Unwin's observations covered the range of geomagnetic latitudes corresponding to l-values ∼3−∼5, the present study is concerned with higher latitudes, corresponding to the range l ∼ 5.7−∼8.
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Nielsen, E., Sofko, G. & Axford, W. STARE observations of long discrete echoes. Nature 299, 238–240 (1982). https://doi.org/10.1038/299238a0
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DOI: https://doi.org/10.1038/299238a0
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