|Name||Cause||Physical Process||Spectroscopic Signature|
|Core dimming||Mass loss||Ejection of emitting plasma from corona||Simultaneous drop of multiple emission lines, with roughly the same percentage decrease|
|Thermal dimming||Temperature evolution||Heating raises lower ionization states (e.g. a fraction of Fe IX becomes Fe X), cooling does the opposite||Heating: Emission loss in lines with lower formation temperatures with roughly simultaneous emission gain in lines with higher formation temperatures. Cooling: reverse of above|
|Obscuration dimming||Obscuration||Dim feature (e.g. filament) moves between observing location and bright feature (e.g. flare arcade)||Drop of emission lines proportional to their absorption cross section in the obscuring material. Also apparent in EUV images|
|Global dimming?||Waves||Shocks propagate globally, causing compression/rarefaction of plasma||Apparent in EUV images, especially using difference movies|
|Doppler shift dimming||Doppler shift||Fast moving plasma causes Doppler shift of emissions, which could start to shift outside instrument bandpass||Doppler shift is seen in spectral measurements (e.g. EVE)|
This is a good place to have the debate about names and the expected spectroscopic signatures. It'd be best to use the comment section below until we reach a consensus, and then we can update the table.