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Originally Posted by Jeff Root
Michael Mozina and Mosheh Thezion, did not realize that the
radiation they are concerned about is not blackbody radiation.
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Aside the fact that the images are taken with very narrow filters I don't think that those arcs will emit blackbody radiation:
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Incandescent, high temperature, solids emit continuous spectra since electrons can fall into neighboring atoms during de-excitation and emit all possible frequencies. Excited gases emit discreet spectra which can be used to identify one gas from another since electrons must remain within ONE ATOM when undergoing energy transitions in gases.
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(from
here)
It seems to me that the low density of those arcs qualifies them mostly as 'excited gas' than 'solid body'. Maybe someone could clarify this question...