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For some forms of steady heating, coronal loops are in a state of thermalnonequilibrium and evolve in a manner that includes accelerated cooling, oftenresulting in the formation of a cold condensation. This is frequently confusedwith thermal instability, but the two are in fact fundamentally different. Weexplain the distinction and discuss situations where they may beinterconnected. Large-amplitude perturbations, perhaps associated with MHDwaves, likely play a role in explaining phenomena that have been attributed tothermal nonequilibrium but also seem to require cross-field communication.

The Distinction Between Thermal Nonequilibrium and Thermal Instability