Observed characteristics of auroral forms

Details Observed characteristics of auroral forms Observed characteristics of auroral forms

Jun 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978ssrv...22...77d&link_type=abstract

Space Science Reviews, vol. 22, June 1978, p. 77-113. NASA-supported research

Physics

27

Auroral Arcs, Night Sky, Photographic Recording, Polar Regions, All Sky Photography, Electric Fields, Field Aligned Currents, Isis-B, Television Systems, Time Response

Scientific paper

Observed characteristics of discrete auroral arcs and pulsating aurora are described, and a mechanism for the discrete auroras is considered. Strong horizontal and vertical electric fields characterize the discrete auroras, since their motions and their distortions indicate the presence of shear processes involving substantial charge excesses and magnetic field-aligned currents. Pulsating auroras do not exhibit shearing behavior and this lack of shearing shows that substantial electric fields are not involved. Transitional types of auroras, including black aurora, are considered.

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