Visible and ultraviolet emissions from the photosphere,chromosphere and transition region. Plage are associated with concentrations of magnetic fields and form a part of the network of bright emission
s that characterize the chromosphere.
On the Sun, an extended H-alpha emission feature of an active region that is seen from the time of emergence of the first magnetic flux until the widely scattered remnant magnetic fields merge with th
e background. Magnetic fields are more intense in plage, and temperatures are higher than in surrounding, quiescent regions.
A low-intensity division in plage coinciding with a polarity inversion line and marked by narrow filament segments and/or fibrils spanning the corridor.
A bright cloud-like feature that appears in the vicinity of a sunspot. Plages represent regions of higher temperature and density within the chromosphere. They are particularly visible when photograph
ed through filters passing the spectral light of hydrogen or calcium.