Description of a nuclear EMP event

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SUMMARY

The discussion centers on the physical accuracy of a fictional nuclear EMP event description, highlighting the immediate and long-term consequences of such an event. Key points include the failure of consumer electronics and transformers due to electromagnetic pulses, the survival of some robotic tractors, and the potential for hospitals to maintain operations through local generators. The conversation also critiques the portrayal of nuclear explosions, emphasizing that they would appear as giant flashbulbs rather than white balls. The implications of military technology and GPS reliance in autonomous vehicles are also discussed.

PREREQUISITES
  • Understanding of electromagnetic pulse (EMP) effects on electronics
  • Knowledge of GPS technology and its application in autonomous vehicles
  • Familiarity with the historical context of nuclear detonations and their consequences
  • Awareness of global treaties regarding nuclear weapons
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  • Research the effects of nuclear EMP on civilian infrastructure
  • Study the design and operation of GPS systems in agricultural machinery
  • Examine historical nuclear tests and their documented impacts on the environment
  • Explore advancements in military technology and their implications for future warfare
USEFUL FOR

This discussion is beneficial for writers, researchers, and enthusiasts interested in post-apocalyptic scenarios, military technology, and the scientific principles behind electromagnetic phenomena.

GTOM
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I wonder whether the following description is physically accurate:

White balls like the Moon appeared on the night sky, when the nukes detonated in the ionosphere. Computers and cellphones ceased to function, transformators were overloaded and smoked. As if ancient, cruel gods punished humanity for their sins, fire rained down to Earth: space to surface missiles turned power plants and protected server rooms to craters. Many have died due to the bombing, or power shortage in hospitals. But the aftermath were even worse. The civilisation collapsed. Many robotic tractors survived the EMP, since their large, metallic bodies protected the electronics like Faraday cages, and most bombs went off above the cities. But eventually, they became inoperative due to lack of fuel and maintenance. Famine ravaged.
 
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GTOM said:
I wonder whether the following description is physically accurate:
Any part specifically, @GTOM?

Depending on when your story is set, many military devices would likely be resistant to EMP, and if we're using photonic computing, consumer devices may be as well. I'm not sure that a "large, metallic body" would protect the innards of a tractor, but even if they did, most such devices would presumably be using GPS for navigation, and the antenna would probably conduct sufficient energy into the electronics to burn them out. The GPS satellites should be okay, they orbit around 20kms up, but ones in lower orbits would be impacted and there might be sufficient atmospheric interference that the tractors would not have consistent signals to navigate by, irrespective of fuel (which would run out well before maintenance was needed, unless they are solar powered with self-return to PV-charged batteries at end of shift. Assuming the solar panels survive the EMP, which is unlikely.

In terms of transformers, there was a superstorm in 1989 and geomagnetic-induced currents melted windings of a large transformer at the Salem Nuclear plant, and that would cause smoke, no doubt, so that's realistic.

The population of hospitals would be trivial compared to the rest of a city, so I'm not sure why you've called that out, but hospitals typically have local generators, so if they did not burn out - and they might not if they were in a basement - ironically a hospital might fare better than the rest of the city.

Where did the space to surface missiles come from? This must be set in the future, as we don't have them currently, they violate numerous global treaties. Irrespective, any large scale bombing in a city would wreak havoc.

But there is a good description of the US nuclear bomb that was detonated in the ionosphere, the explosions are not going to be "white balls like the Moon", they are going to be giant flashbulbs going off, visible across continents! Which is much more dramatic and would be fun to write.

https://space4peace.org/why-the-u-s-once-set-off-a-nuclear-bomb-in-space/
 
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Melbourne Guy said:
Any part specifically, @GTOM?

Depending on when your story is set, many military devices would likely be resistant to EMP, and if we're using photonic computing, consumer devices may be as well. I'm not sure that a "large, metallic body" would protect the innards of a tractor, but even if they did, most such devices would presumably be using GPS for navigation, and the antenna would probably conduct sufficient energy into the electronics to burn them out. The GPS satellites should be okay, they orbit around 20kms up, but ones in lower orbits would be impacted and there might be sufficient atmospheric interference that the tractors would not have consistent signals to navigate by, irrespective of fuel (which would run out well before maintenance was needed, unless they are solar powered with self-return to PV-charged batteries at end of shift. Assuming the solar panels survive the EMP, which is unlikely.

In terms of transformers, there was a superstorm in 1989 and geomagnetic-induced currents melted windings of a large transformer at the Salem Nuclear plant, and that would cause smoke, no doubt, so that's realistic.

The population of hospitals would be trivial compared to the rest of a city, so I'm not sure why you've called that out, but hospitals typically have local generators, so if they did not burn out - and they might not if they were in a basement - ironically a hospital might fare better than the rest of the city.

Where did the space to surface missiles come from? This must be set in the future, as we don't have them currently, they violate numerous global treaties. Irrespective, any large scale bombing in a city would wreak havoc.

But there is a good description of the US nuclear bomb that was detonated in the ionosphere, the explosions are not going to be "white balls like the Moon", they are going to be giant flashbulbs going off, visible across continents! Which is much more dramatic and would be fun to write.

https://space4peace.org/why-the-u-s-once-set-off-a-nuclear-bomb-in-space/
Ok, thanks for the info. I didnt know tractors rely so much on GPS. Hospitals, if all electronic device stop working on intensive care, it is still nasty, isn't it?
Those treaties were no longer since the leaders of the world could escape to Moon.
 
GTOM said:
I didnt know tractors rely so much on GPS
Oops, my bad. I'd assumed they are autonomous - though even large ones now use GPS for fine control of their line across large fields. But yeah, manual ones generally won't 👍
 
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