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.
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.
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.