Will a corona discharge form around a charged glass insulator (without a conductor)?

Peter Ahlman

...........Considering there is NO dielectric breakdown or breaking of glass/dielectric..............

Can there be a corona discharge ever around a charged glass/dielectric without a conductor in the vicinity?
For instance; take a single-electrode glass high-vacuum tube, charge it to high voltage like 4 millions. Electrons will be emitted from the electrode in the vacuum, but will there be a CORONA discharge in the free air outside and around the glass-tube?

Regards
Peter