Posted: May 22nd, 2023

The gaseous corona discharge is made possible at low temperatures

The gaseous corona discharge is made possible at low temperatures and is classified as a non-LTE (Local thermodynamic (or thermal) equilibrium plasma discharge. The discharge can either be positive or negative corona depending on the applied voltage at the end of the cathode wire. Typically, when power is applied at the end of the wire, a discharge occurs, which creates a lightning crown around the wire causing a phenomenon known as the gaseous corona. Corona discharges occur on sharp points, thin wires, and edges where the electric field has enough potential to cause the discharge. Corona discharge is defined as “a weak luminous discharge that usually takes place at or near atmospheric pressure” [Chang, Lawless and Yamamoto 1[13]. It is a non-uniform spatial ionizable electric field of the gas, which is found near the pin-shaped electrode, which consists of a dark non-visible weak electric field discharge gap when viewed from the outside region as shown below.