DC corona discharge - définition. Qu'est-ce que DC corona discharge
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Qu'est-ce (qui) est DC corona discharge - définition

ELECTRICAL DISCHARGE BROUGHT ON BY THE IONIZATION OF A FLUID SUCH AS AIR SURROUNDING A CONDUCTOR THAT IS ELECTRICALLY CHARGED
Coronal Discharge; Coronal discharge; Corona effect; Corona wire; Corona Discharge Pinwheel; Corona loss; Corona discharges; Corona (electric discharge); Coronal discharge effect
  • A variety of forms of corona discharge, from various metal objects. Notice, especially in the last two pictures, how the discharge is concentrated at the points on the objects.
  • electric utilities]].
  • Schwitzerland]]) in foggy weather conditions (long time exposure 30 seconds).
  • Large corona discharges ''(white)'' around conductors energized by a 1.05 million volt transformer in a U.S. NIST laboratory in 1941
  • Corona discharge from a spoon attached to the high voltage terminal of a [[Tesla coil]].
  • Corona discharge on a [[Wartenberg wheel]]
  • The corona discharge around a high-voltage coil

Stellar corona         
  • Hinode]] on 12 January 2007, reveals the filamentary nature of the corona.
  • Arcing active region by [[Solar Dynamics Observatory]]
  • Image taken by the [[Solar Dynamics Observatory]] on October 16, 2010. A very long filament cavity is visible across the Sun's southern hemisphere.
  • On August 31, 2012, a long filament of solar material that had been hovering in the Sun's outer atmosphere, the corona, erupted at 4:36 p.m. EDT
  • coronal streamers]].
  • NASA animation of the [[Parker Solar Probe]] passing through the Sun's corona. Inside the corona's boundary, its [[Alfvén surface]], plasma waves travel back and forth to the Sun's surface.
  • Illustration depicting [[solar prominences]] and sunspots
  • °C}} (304 Å—red), and 2.5 million °C (286 Å—yellow).
  • [[STEREO]] – First images as a slow animation
  • Filament erupting during a solar flare, seen at EUV wavelengths ([[TRACE]])
  • Kinderhook, New York]].
  • TRACE 171Å coronal loops
  • A drawing demonstrating the configuration of solar magnetic flux during the solar cycle
  • A new visualisation technique can provide clues to the coronal heating problem.
OUTERMOST LAYER OF A STAR'S ATMOSPHERE
Solar corona; Coronal activity; Stellar coronae; Stellar Corona; Coronal heating problem; Sun's corona; K corona; E corona; F corona; K-corona; Coronaz; Corona (physics); Corona of the sun; Coronal heating
A corona ( coronas or coronae) is the outermost layer of a star's atmosphere. It consists of plasma.
Military discharge         
  • World War I poster depicting a soldier holding his honorable discharge.
RELEASE FROM MILITARY SERVICE
Dishonorable discharge; Honorable discharge; General discharge; Discharge from duty; Honorable Discharge; Dishonourable discharge; Honourable discharge; Honorably discharged; Bad conduct discharge; Bad conduct; Dishonorably discharged; Other than honorable discharge; Discharge (military); Bad Conduct Discharge; Dishonorably discharge; US Military discharge; U.S. military discharge; Honorary discharge; Honorably discharge; Duck dinner; Big chicken dinner; Bad-conduct discharge; Discharge without honor; Discharged with honors
A military discharge is given when a member of the armed forces is released from their obligation to serve. Each country's military has different types of discharge.
Glow discharge         
  • Glow discharge in a low-pressure tube caused by electric current.
  • A 5651 voltage-regulator tube in operation
  • Voltage-current characteristics of electrical discharge in neon at 1 torr, with two planar electrodes separated by 50&nbsp;cm.<br/>
A: random pulses by [[cosmic radiation]]<br/>
B: saturation current<br/>
C: avalanche Townsend discharge<br/>
D: self-sustained Townsend discharge<br/>
E: unstable region: [[corona discharge]]<br/>
F: sub-normal glow discharge<br/>
G: normal glow discharge<br/>
H: abnormal glow discharge<br/>
I: unstable region: glow-arc transition<br/>
J: [[electric arc]]<br/>
K: electric arc<br/>
'''A-D region: dark discharge'''; ionisation occurs, current below 10 microamps.<br/>
'''F-H region: glow discharge'''; the plasma emits a faint glow. <br/>
'''I-K region: arc discharge'''; large amounts of radiation produced.
  • DC powered neon lamp, showing glow discharge surrounding only the cathode
PLASMA FORMED BY THE PASSAGE OF ELECTRIC CURRENT THROUGH A GAS
Aston Dark Space; Electron space discharge; Glow discharge optical spectroscopy; Glow discharge ionization; Aston dark space; Direct-current discharge; DC discharges; Direct current discharge; DC coupled plasma; Electric glow discharge; Cathode fall
A glow discharge is a plasma formed by the passage of electric current through a gas. It is often created by applying a voltage between two electrodes in a glass tube containing a low-pressure gas.

Wikipédia

Corona discharge

A corona discharge is an electrical discharge caused by the ionization of a fluid such as air surrounding a conductor carrying a high voltage. It represents a local region where the air (or other fluid) has undergone electrical breakdown and become conductive, allowing charge to continuously leak off the conductor into the air. A corona discharge occurs at locations where the strength of the electric field (potential gradient) around a conductor exceeds the dielectric strength of the air. It is often seen as a bluish glow in the air adjacent to pointed metal conductors carrying high voltages, and emits light by the same mechanism as a gas discharge lamp.

In many high voltage applications, corona is an unwanted side effect. Corona discharge from high voltage electric power transmission lines constitutes an economically significant waste of energy for utilities. In high voltage equipment like cathode ray tube televisions, radio transmitters, X-ray machines, and particle accelerators, the current leakage caused by coronas can constitute an unwanted load on the circuit. In the air, coronas generate gases such as ozone (O3) and nitric oxide (NO), and in turn, nitrogen dioxide (NO2), and thus nitric acid (HNO3) if water vapor is present. These gases are corrosive and can degrade and embrittle nearby materials, and are also toxic to humans and the environment.

Corona discharges can often be suppressed by improved insulation, corona rings, and making high voltage electrodes in smooth rounded shapes. However, controlled corona discharges are used in a variety of processes such as air filtration, photocopiers, and ozone generators.