Observations

1) Not much glow in a negative discharge mode. “Aurora” visible, as are electron ring current. X-rays are not as common as electron bombardment. Spinning the magnet had no noticeable effect.
2) Plasma brightens considerably in a positive discharge mode. X-rays become more prevalent. “Accretion disk” forms. Arcs become common.
3) At 30mTorr, glow becomes two tone. Arcs were sporadic and bright. Arcs from top to bottom of magnet observed, often in post-noon sector. Xrays became bright. Spinning magnet changed X-rays.

1) Not much glow in a negative discharge mode. “Aurora” visible, as are electron ring current. X-rays are not as common as electron bombardment. Spinning the magnet had no noticeable effect.