email@example.com - last update: 18 February 1997, 1100 UT (RR)
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
- 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.