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Electromagnetic pulse: Difference between revisions

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{{SeeWikipedia}}
{{SeeWikipedia}}
{{References}}
[[File:1249522072-Snap28.png|right|thumb|The [[EMP Medal]] given to a player in ''[[Halo 3: ODST]]'' and in ''[[Halo 3]]'' when killing an enemy shortly after their shields are deactivated.]]
[[File:1249522072-Snap28.png|right|thumb|The [[EMP Medal]] given to a player in ''[[Halo 3: ODST]]'' and in ''[[Halo 3]]'' when killing an enemy shortly after their shields are deactivated.]]
'''Electromagnetic Pulse''', or '''EMP''' is the electromagnetic radiation from an explosion (especially a nuclear explosion) or an intensely fluctuating magnetic field caused by Compton-recoil electrons and photoelectrons from photons scattered in the materials of the electronic or explosive device or in a surrounding medium. While organic tissue is unaffected, the resulting electric and magnetic fields may couple with electrical/electronic systems to produce damaging current and voltage surges. The effects are usually not noticeable beyond the blast radius unless the device is nuclear or specifically designed to produce an electromagnetic shockwave. An alternate definition is: a broadband, high-intensity, short-duration burst of electromagnetic energy.
'''Electromagnetic pulse''', or '''EMP''' is the electromagnetic radiation from an explosion (especially a nuclear explosion) or an intensely fluctuating magnetic field caused by Compton-recoil electrons and photoelectrons from photons scattered in the materials of the electronic or explosive device or in a surrounding medium. While organic tissue is unaffected, the resulting electric and magnetic fields may couple with electrical/electronic systems to produce damaging current and voltage surges. The effects are usually not noticeable beyond the blast radius unless the device is nuclear or specifically designed to produce an electromagnetic shockwave. An alternate definition is: a broadband, high-intensity, short-duration burst of electromagnetic energy.


The worst of an electromagnetic pulse generally only lasts for a second, but any unprotected electrical equipment will be affected by the pulse.  
The worst of an electromagnetic pulse generally only lasts for a second, but any unprotected electrical equipment will be affected by the pulse.  


==Appearances==
==Notable examples==
EMP is mentioned several times in the [[Halo universe|Halo Universe]]:
There have been several noteworthy instances in which an EMP has appeared.


*In the level [[Two Betrayals]] in ''[[Halo: Combat Evolved]]'', [[Cortana]] diverts John's [[energy shielding|energy shields]] into an EMP to disable [[Installation 04|Halo's]] [[Phase pulse generator|Phase Pulse Generators]].
*During the [[Battle of Installation 04]], [[Cortana]] diverted [[John-117]]'s [[energy shielding|energy shields]] into an EMP to disable [[Installation 04|Halo's]] [[phase pulse generator]]s.<ref>'''[[Halo: Combat Evolved]]''', campaign level ''[[Two Betrayals]]''</ref>
*The detonation of [[Shiva-class nuclear missile|Shiva-class Nuclear Warheads]] are almost always followed by a massive electromagnetic pulse.
*The detonation of a [[nuclear weapon]], such as a [[Shiva-class nuclear missile]], is almost always followed by a massive electromagnetic pulse.
*The [[Deep-space artifact|Deep-Space Artifact]] let out an enormous electromagnetic pulse that briefly canceled out all communications in the [[Sol system|Sol System]]. It later let out another pulse upon deactivation.
*The [[deep-space artifact]] let out an enormous electromagnetic pulse that briefly canceled out all communications in the [[Sol system]]. It later let out another pulse upon deactivation.
*In ''[[Halo: First Strike]]'', [[John-117]] used a [[Type-1 Antipersonnel Grenade|Plasma Grenade]]'s EMP charge to disable the electronics of a locked door on ''[[Ascendant Justice]]''. This allowed him to open the door.
*During the [[Skirmish over Threshold]], [[John-117]] used the EMP emitted by a [[Type-1 Antipersonnel Grenade|Plasma Grenade]] to disable the electronics of a locked door on ''[[Ascendant Justice]]'', which allowed him to open the door.
*The in-atmosphere jumping of the ''[[Solemn Penance]]'' to [[Slipstream space|Slipspace]] above [[New Mombasa]] creates a massive electromagnetic pulse that damaged electrical systems in the city, and fried the navigational and safety systems of nearly five dozen [[Single Occupant Exoatmospheric Insertion Vehicle|SOEIV]] pods unfortunate enough to drop into the city at that exact moment, plunging them and the [[Orbital Drop Shock Trooper]]s inside free-falling to certain death.
*The in-atmosphere jumping of the ''[[Solemn Penance]]'' to [[Slipstream space|slipspace]] above [[New Mombasa]] created a massive electromagnetic pulse that damaged electrical systems in the city, and fried the navigational and safety systems of nearly five dozen [[Single Occupant Exoatmospheric Insertion Vehicle|SOEIV]] pods unfortunate enough to drop into the city at that exact moment, plunging them and the [[Orbital Drop Shock Trooper]]s inside free-falling to near-certain death.<ref>'''[[Halo 3: ODST]]''', campaign level ''[[Prepare to Drop]]''</ref>
*In the aftermath of [[Operation: UPPER CUT|Operation: UPPERCUT]], both [[SPARTAN-B312]] and the satellite [[Navigation Beacon RA-15]] witnessed a purple-tinted EMP cloud emanate from the wreckage of the [[Long Night of Solace]] after the improvised slipspace bomb was activated. The cloud disabled all electronics within its vicinity, including the NAV Beacon.
*In the aftermath of [[Operation: UPPER CUT]], both [[SPARTAN-B312]] and the satellite [[Navigation Beacon RA-15]] witnessed a purple-tinted EMP cloud emanate from the wreckage of the [[Covenant supercarrier]] ''[[Long Night of Solace]]'' after the improvised slipspace bomb was activated. The cloud disabled all electronics within its vicinity, including the NAV Beacon.


===Gameplay===
===Gameplay===
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*In ''[[Halo 2]]'', the [[Sentinel]]s sometimes emit an EMP when destroyed. This effect disables shields, but vehicles are unaffected.
*In ''[[Halo 2]]'', the [[Sentinel]]s sometimes emit an EMP when destroyed. This effect disables shields, but vehicles are unaffected.
*In ''Halo 3'', the [[Power drain|Power Drain]] uses EMP to disable shields, vehicles and other power sources.
*In ''Halo 3'', the [[power drain]] uses EMP to disable shields, vehicles and other power sources.
*A charged [[Type-25 Directed Energy Pistol|Plasma Pistol]] blast will temporarily disable vehicles and energy shields much like the power drain.
*A charged [[Type-25 Directed Energy Pistol|Plasma Pistol]] blast will temporarily disable vehicles and energy shields much like the power drain.
*In ''Halo: Reach'' the [[M319 Individual Grenade Launcher]] has a secondary function that acts like an EMP. It awards a player an [[EMP Medal]] when it kills an enemy, being the only other weapon in the game that awards the medal.
*In ''Halo: Reach'' the [[M319 Individual Grenade Launcher]] has a secondary function that acts like an EMP. It awards a player an [[EMP Medal]] when it kills an enemy, being the only other weapon in the game that awards the medal.
*In ''Halo: Reach'', [[Armor lock|Armor Lock]] can trigger an EMP after use, which can take out a Spartan's shields. Combined with a quick and accurate melee, this can result in an almost instant kill.
*In ''Halo: Reach'', [[Armor lock|Armor Lock]] can trigger an EMP after use, which can take out a Spartan's shields. Combined with a quick and accurate melee, this can result in an almost instant kill.
*In ''Halo Wars'', [[Ellen Anders|Professor Anders]]' vehicle, the [[Gremlin Combat Support Vehicle|Gremlin]], uses EMP as main armament to disable enemy non-infantry units.
*In ''Halo Wars'', [[Ellen Anders|Professor Anders]]' vehicle, the [[Gremlin Combat Support Vehicle|Gremlin]], uses EMP as main armament to disable enemy non-infantry units.
*In ''Halo Wars'', the [[Vampire]]'s [[Stasis cannon|Stasis Drain Cannon]] uses EMP as well to drain power from enemy aircraft.
*In ''Halo Wars'', the [[Vampire]]'s [[stasis cannon]] uses EMP as well to drain power from enemy aircraft.


==Trivia==
==Trivia==

Revision as of 11:16, September 13, 2011

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File:1249522072-Snap28.png
The EMP Medal given to a player in Halo 3: ODST and in Halo 3 when killing an enemy shortly after their shields are deactivated.

Electromagnetic pulse, or EMP is the electromagnetic radiation from an explosion (especially a nuclear explosion) or an intensely fluctuating magnetic field caused by Compton-recoil electrons and photoelectrons from photons scattered in the materials of the electronic or explosive device or in a surrounding medium. While organic tissue is unaffected, the resulting electric and magnetic fields may couple with electrical/electronic systems to produce damaging current and voltage surges. The effects are usually not noticeable beyond the blast radius unless the device is nuclear or specifically designed to produce an electromagnetic shockwave. An alternate definition is: a broadband, high-intensity, short-duration burst of electromagnetic energy.

The worst of an electromagnetic pulse generally only lasts for a second, but any unprotected electrical equipment will be affected by the pulse.

Notable examples

There have been several noteworthy instances in which an EMP has appeared.

Gameplay

EMP is also an in-game effect in the Halo games, that disables energy shields and vehicles. It is produced by certain weapons and equipment.

  • In Halo 2, the Sentinels sometimes emit an EMP when destroyed. This effect disables shields, but vehicles are unaffected.
  • In Halo 3, the power drain uses EMP to disable shields, vehicles and other power sources.
  • A charged Plasma Pistol blast will temporarily disable vehicles and energy shields much like the power drain.
  • In Halo: Reach the M319 Individual Grenade Launcher has a secondary function that acts like an EMP. It awards a player an EMP Medal when it kills an enemy, being the only other weapon in the game that awards the medal.
  • In Halo: Reach, Armor Lock can trigger an EMP after use, which can take out a Spartan's shields. Combined with a quick and accurate melee, this can result in an almost instant kill.
  • In Halo Wars, Professor Anders' vehicle, the Gremlin, uses EMP as main armament to disable enemy non-infantry units.
  • In Halo Wars, the Vampire's stasis cannon uses EMP as well to drain power from enemy aircraft.

Trivia

  • If you disable a vehicle using an EMP, it will show an animation of some sparks flying around but if you disable it again before it is drivable then the animation will stop and the vehicle will not work.
  • Some vehicles disabled by an EMP will still have full functionality of its weapons if it has any. For example, if a Warthog is disabled by an EMP, the turret will still be able to turn around and shoot. Likewise, a Banshee, while grounded, will still be able to boost and perform tricks.

Gallery

  • An EMP from a Plasma Pistol overcharge hits a Spartan III in the Halo: Reach Beta.

    An EMP from a Plasma Pistol overcharge hits a Spartan III in the Halo: Reach Beta.

  • Another devastating EMP charge from the Plasma Pistol in the Beta.

    Another devastating EMP charge from the Plasma Pistol in the Beta.

  • An EMP wave from the Armor Lock ability can disrupt nearby enemy shields.

    An EMP wave from the Armor Lock ability can disrupt nearby enemy shields.

  • The Plasma Pistol's AOE secondary charge function emits an EMP burst to deactivate a Covenant Wraith tank for a short period of time.

    The Plasma Pistol's AOE secondary charge function emits an EMP burst to deactivate a Covenant Wraith tank for a short period of time.

Sources

  1. ^ Halo: Combat Evolved, campaign level Two Betrayals
  2. ^ Halo 3: ODST, campaign level Prepare to Drop
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