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Alex,
I have a question brought up by one of the comets-ml members.
"I expect one piece of evidence lacking, given the proposal that comet jets
are caused by electric discharge, is the absence of emission spectra
characteristic of such discharges. For comets, we generally only see
emission spectra from the faster-moving, more tenuous gaseous fraction
activated by irradiation from the Sun and solar wind. The claims are that
the electrical discharges are most intense at or near the comet nucleus and
are so great as to lead to 'electric discharge machining' of the surface
with the jets comprising excavated material moving along the electric field
lines or arcs. So what is their explanation for the lack of emission
spectra in and around these jets?"
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