CME core: optically thick at all FASR
frequencies, but can be imaged only at higher
frequencies because of the low brightness
temperature
CME frontal: can be easily observed in
meterwaves if the nonthermal emission is not too
strong. In microwaves behind-the-limb high
density CMEs can be imaged.
Nonthermal emission from electrons trapped in
CME substructures can be a good source of
information
Filaments & filament Cavities on the disk à CME
source regions