If you wish to contribute or participate in the discussions about articles you are invited to join SKYbrary as a registered user
St Elmo's Fire
From SKYbrary Wiki
| Article Information | ||
|---|---|---|
| Category: | Weather | 
|
| Content source: | SKYbrary | 
|
| Content control: | EUROCONTROL | 
|
| WX | |
|---|---|
| Tag(s) | Weather Phenomena |
Description
A visible luminous electrical discharge observed around parts of an aircraft when the electrical charge on the aircraft becomes sufficiently intense. Similar in nature to the glow from a neon tube, and often observed as brushlike fiery jets extending from the tip of an aerial, a wing, propeller, or other part of an aircraft.
Characteristics
St. Elmo's Fire occurs when the atmosphere becomes charged and an electrical potential strong enough to cause a discharge (plasma) is created between an object and the air around it. This can happen to an aircraft flying through heavily charged skies. St Elmo's Fire is usually bluish or violet in colour.
While not a hazard in itself, St Elmo's Fire is an indication of Thunderstorm activity and may be a precursor to a Lightning strike.
Apparently, St. Elmo's Fire can sometimes be heard "singing" on the aircraft's radio, a frying or hissing sound running up and down the musical scale.