Definition
A loss of electrical energy from a high-voltage conductor caused by ionization of the surrounding air. When the voltage on a conductor is high enough, the air immediately around it breaks down and becomes partially conductive, allowing current to leak away as a faint glow, hissing sound, and radio interference rather than staying in the wire.
Plain English
Electricity escaping into the air around a high-voltage wire because the air itself starts to conduct. The escaped energy is wasted and can also cause radio static.
Context Anchor
Seen in aircraft electrical, antenna, and high-voltage system discussions, especially when insulation condition, sharp points, or unwanted electrical leakage are being considered.
Derivation
From the Latin corona, meaning 'crown' or 'wreath,' because the ionized air around the conductor often appears as a faint glowing halo. The name describes what the discharge looks like in the dark.
Why Pilots Care
Corona loss wastes electrical energy and is a common source of radio noise and ignition system interference. Worn or contaminated ignition leads can develop corona discharge, degrading radio reception and engine performance.
Grounding Statement
Picture electricity that should stay inside a wire or system instead escaping slightly into the air around it.
Intuition Check
Corona loss is not about the sun, a virus, or a brand name. In this context, corona means an electrical glow or leakage through the air around a highly charged part.
Example Sentence 1
Cracked insulation on the ignition harness was producing corona loss, which showed up as static on the radios during engine run-up.
Example Sentence 2
At higher altitudes the lower air density increases the chance of corona loss in the ignition system.