Auroral forms | Article about auroral forms by The Free Dictionary
auroral forms[ə′rȯr·əl ′fȯrmz]
Auroral display types, of which two are basic: ribbonlike bands and cloudlike surfaces.
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.