arch filament system

Alternative definitions (0), class: vernacular (0)
Term: arch filament system

A system of small, arched linear-absorption H-alpha features connecting bright, compact plage of opposite polarity. An AFS is a sign of emerging bipolar magnetic flux and possibly rapid or continued growth in an active region.

Created 2023.04.16
Last Modified 2023.04.16
Contributed by Ryan McGranaghan