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Black aurora is a lack of auroral emission in a small, well-defined region within an otherwise uniform,diffuse background or within auroras exhibiting a degree of shear behaviour intermediate between that of diffuse and discrete aurora (e.g., Davis, 1978). It appears to be a common feature of the midnight sector during late substorm recovery phase (Trondsen and Cogger, 1997).

References

  • Davis, T. N., Observed microstructure of auroral forms,J. Geomagn. Geoelectr., 30, 371-380, 1978.
  • Trondsen T. S. and L. L. Cogger, High-resolution television observations of black aurora, J. Geophys. Res., 102, 363-378, 1997.
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