auroral forms

auroral forms

[ə′rȯr·əl ′fȯrmz]
(geophysics)
Auroral display types, of which two are basic: ribbonlike bands and cloudlike surfaces.
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References in periodicals archive ?
An Arctic field manual of 1875 noted that the variety of auroral forms was so great that "no definite rules can be laid down for observing them.
Sitting next to my magnetometer (3,4) in Edinburgh it was possible to compare changes in auroral forms with corresponding changes in the Earth's magnetic field.