Definitions for "Active Region"
Keywords:  sunspot, plage, faculae, bjt, cutoff
A region of intense magnetic fields on the visible surface of the Sun, usually related to a group of sunspots. Active regions are often source points for ejection of material from the overlying solar corona (as CMEs) into interplanetary space. The magnetic complexity of active regions determines the likelihood of flares and CMEs. Back to the top.
The region of BJT operation between saturation and cutoff used for linear amplification.
Part of the solar atmosphere that is associated with a magnetic field where solar events often take place.
layer of semiconductor material where radiative recombination takes place. Also ACTIVE LAYER.