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They mention they can also look at observations at 0.65 keV O line in absorption or emission, but these may also appear in a BC plasma (?)
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Hi Craig,
Is this supposed to be a absorption/emission line for a BC?
If you can confirm this then it is may be possible to differentiate between a plasma (or a gas with a low ionization content) and a BC.
A BC current is a magnetic field aligned current hence it is possible for the emission/absorption line in the spectrum to split in the presence of the magnetic field.
http://en.wikipedia.org/wiki/Zeeman_effect
This of course assumes the plasma or low ionization gas is not in an external magnetic field.
Regards
Steven