Question

How does air density affect corona discharge?

Answer 1

A corona discharge is an electrical discharge brought on by the ionization of a fluid such as air surrounding a conductor that is electrically charged. Spontaneous corona discharges occur naturally in high-voltage systems unless care is taken to limit the electric field strength

Answer 2

When the air near the point becomes conductive, it has the effect of increasing the apparent size of the conductor. ... Corona discharge only forms when the electric field (potential gradient) at the surface of the conductor exceeds a critical value, the dielectric strength or disruptive potential gradient of the fluid.