Small-scale structures in flickering aurora

Details Small-scale structures in flickering aurora Small-scale structures in flickering aurora

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3523103w&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 23, CiteID L23103

Physics

6

Magnetospheric Physics: Auroral Phenomena (2407), Ionosphere: Particle Precipitation, Ionosphere: Plasma Waves And Instabilities (2772), Ionosphere: Auroral Ionosphere (2704)

Scientific paper

A state-of-the-art multispectral imager has been used to study the flickering component of an auroral event at high spatial (40 m) and temporal (32 fps) resolution. Scale sizes for the flickering patches were found to be regularly smaller than 1 km. The typical flickering frequency observed was in the range 6-8 Hz, although flickering patches at both lower and higher frequencies were identified. The flickering structure was correlated with the coincident non-flickering aurora, showing that although there is a temporal relationship between the two, there is no spatial correlation. These results support the theory that flickering structure is caused by interfering dispersive Alfvén waves.

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