Formation of the periodic structures of auroras.

Details Formation of the periodic structures of auroras. Formation of the periodic structures of auroras.

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991ge%26ae..31..309k&link_type=abstract

Geomagn. Aeron., Vol. 31, No. 2, p. 309 - 311

Physics

Aurorae: Structure, Aurorae: Periods

Scientific paper

It is shown that the stratification of electron streams precipitating into the atmosphere into small-scale forms (rays, laminae, etc.) may result from the development of filamentary (aperiodic) instability. The ray structure of the polar aurora, in both nature and external form, is similar to the picture of the filamentary nature of relativistic electron beams obsered in laboratory experiments. The instability is dissipative in nature; it requires the presence of collisions of the precipitating electrons with the surrounding medium, and in general does not require the presence of a background plasma.

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