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Size of electromagnet needed to replicate Earth's magnetic field

What is the source of Earth's magnetic field?Can superconducting magnets fly (or repel the earth's core)?How to size an electromagnetWhy is the magnetic field stronger at the edges of a bar magnet?Can you create a powerful magnetic field out of confined circulating electrons only?Repelling a weak permanent magnet with an electromagnetGraphene - Can it produce a magnetic field?Feasiblity of a long spinning top using an electromagnet to pull on Earth's magnetic fieldHow strong is Earth's magnetic field in space?Why doesn't a permanent magnetic field not make a florescent light illuminate like an electromagnet field?

10

1

$begingroup$

I guess the title says it all. How big of an electromagnet would you need to generate a magnetic field the same as Earth's? Like, what kind of amperes are we talking here? (Assuming a hypothetical superconducting magnet, of course.)

electromagnetism magnetic-fields electric-current estimation geomagnetism

share|cite|improve this question

edited 1 hour ago

Qmechanic♦

108k122021255

asked 21 hours ago

Lajos NagyLajos Nagy

20314

$endgroup$

add a comment | 

10

1

$begingroup$

I guess the title says it all. How big of an electromagnet would you need to generate a magnetic field the same as Earth's? Like, what kind of amperes are we talking here? (Assuming a hypothetical superconducting magnet, of course.)

electromagnetism magnetic-fields electric-current estimation geomagnetism

share|cite|improve this question

edited 1 hour ago

Qmechanic♦

108k122021255

asked 21 hours ago

Lajos NagyLajos Nagy

20314

$endgroup$

add a comment | 

$begingroup$

I guess the title says it all. How big of an electromagnet would you need to generate a magnetic field the same as Earth's? Like, what kind of amperes are we talking here? (Assuming a hypothetical superconducting magnet, of course.)

electromagnetism magnetic-fields electric-current estimation geomagnetism

share|cite|improve this question

edited 1 hour ago

Qmechanic♦

108k122021255

asked 21 hours ago

Lajos NagyLajos Nagy

20314

$endgroup$

share|cite|improve this question

edited 1 hour ago

Qmechanic♦

108k122021255

asked 21 hours ago

Lajos NagyLajos Nagy

20314

share|cite|improve this question

edited 1 hour ago

Qmechanic♦

108k122021255

asked 21 hours ago

Lajos NagyLajos Nagy

20314

edited 1 hour ago

Qmechanic♦

108k122021255

edited 1 hour ago

Qmechanic♦

108k122021255

asked 21 hours ago

Lajos NagyLajos Nagy

20314

asked 21 hours ago

Lajos NagyLajos Nagy

20314

1 Answer
1

active

oldest

votes

18

$begingroup$

You are in luck, since Osamu Motojima and Nagato Yanagi have already calculated it for you in their report Feasibility of Artificial Geomagnetic Field Generation by a Superconducting Ring Network. They conclude that producing 10% of the current field is feasible using "12 latitudinal high-temperature superconducting rings, each carrying 6.4 MA current with a modest 1 GW of power requirement".

(The motivation for the report is the concern about the consequences of Earth losing its field during a geomagnetic reversal, but it doesn't look like those are particularly bad.)

share|cite|improve this answer

answered 19 hours ago

Anders SandbergAnders Sandberg

10.6k21532

$endgroup$

• 
  
  
  

  
  5
  

  
  
  
  
  
  

  
  $begingroup$
  Is this linear, i.e. can we extrapolate this to 100% of the current field?
  $endgroup$
  – Paŭlo Ebermann
  9 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  I think so, although you may have to make the rings bigger to keep things safely under the superconduction limits.
  $endgroup$
  – Anders Sandberg
  6 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Also, if mankind is ever going to terraform Mars, we definitely need an equatorial magnetizer! ;-)
  $endgroup$
  – cmaster
  3 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @cmaster - One can put coils in the L1 point to deflect the solar wind at Mars: medium.com/our-space/…
  $endgroup$
  – Anders Sandberg
  2 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @AndersSandberg Seems like I forgot to add the <insider-joke> tags - obviously you don't know the game... Anyway, good to know that there are other potentially more practicable options :-)
  $endgroup$
  – cmaster
  1 hour ago
  

  
  
  
  

 | 
show 1 more comment

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18

$begingroup$

You are in luck, since Osamu Motojima and Nagato Yanagi have already calculated it for you in their report Feasibility of Artificial Geomagnetic Field Generation by a Superconducting Ring Network. They conclude that producing 10% of the current field is feasible using "12 latitudinal high-temperature superconducting rings, each carrying 6.4 MA current with a modest 1 GW of power requirement".

(The motivation for the report is the concern about the consequences of Earth losing its field during a geomagnetic reversal, but it doesn't look like those are particularly bad.)

share|cite|improve this answer

answered 19 hours ago

Anders SandbergAnders Sandberg

10.6k21532

$endgroup$

• 
  
  
  

  
  5
  

  
  
  
  
  
  

  
  $begingroup$
  Is this linear, i.e. can we extrapolate this to 100% of the current field?
  $endgroup$
  – Paŭlo Ebermann
  9 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  I think so, although you may have to make the rings bigger to keep things safely under the superconduction limits.
  $endgroup$
  – Anders Sandberg
  6 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Also, if mankind is ever going to terraform Mars, we definitely need an equatorial magnetizer! ;-)
  $endgroup$
  – cmaster
  3 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @cmaster - One can put coils in the L1 point to deflect the solar wind at Mars: medium.com/our-space/…
  $endgroup$
  – Anders Sandberg
  2 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @AndersSandberg Seems like I forgot to add the <insider-joke> tags - obviously you don't know the game... Anyway, good to know that there are other potentially more practicable options :-)
  $endgroup$
  – cmaster
  1 hour ago
  

  
  
  
  

 | 
show 1 more comment

18

$begingroup$

You are in luck, since Osamu Motojima and Nagato Yanagi have already calculated it for you in their report Feasibility of Artificial Geomagnetic Field Generation by a Superconducting Ring Network. They conclude that producing 10% of the current field is feasible using "12 latitudinal high-temperature superconducting rings, each carrying 6.4 MA current with a modest 1 GW of power requirement".

(The motivation for the report is the concern about the consequences of Earth losing its field during a geomagnetic reversal, but it doesn't look like those are particularly bad.)

share|cite|improve this answer

answered 19 hours ago

Anders SandbergAnders Sandberg

10.6k21532

$endgroup$

• 
  
  
  

  
  5
  

  
  
  
  
  
  

  
  $begingroup$
  Is this linear, i.e. can we extrapolate this to 100% of the current field?
  $endgroup$
  – Paŭlo Ebermann
  9 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  I think so, although you may have to make the rings bigger to keep things safely under the superconduction limits.
  $endgroup$
  – Anders Sandberg
  6 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  Also, if mankind is ever going to terraform Mars, we definitely need an equatorial magnetizer! ;-)
  $endgroup$
  – cmaster
  3 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @cmaster - One can put coils in the L1 point to deflect the solar wind at Mars: medium.com/our-space/…
  $endgroup$
  – Anders Sandberg
  2 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @AndersSandberg Seems like I forgot to add the <insider-joke> tags - obviously you don't know the game... Anyway, good to know that there are other potentially more practicable options :-)
  $endgroup$
  – cmaster
  1 hour ago
  

  
  
  
  

 | 
show 1 more comment

$begingroup$

You are in luck, since Osamu Motojima and Nagato Yanagi have already calculated it for you in their report Feasibility of Artificial Geomagnetic Field Generation by a Superconducting Ring Network. They conclude that producing 10% of the current field is feasible using "12 latitudinal high-temperature superconducting rings, each carrying 6.4 MA current with a modest 1 GW of power requirement".

(The motivation for the report is the concern about the consequences of Earth losing its field during a geomagnetic reversal, but it doesn't look like those are particularly bad.)

share|cite|improve this answer

answered 19 hours ago

Anders SandbergAnders Sandberg

10.6k21532

$endgroup$

share|cite|improve this answer

answered 19 hours ago

Anders SandbergAnders Sandberg

10.6k21532

answered 19 hours ago

Anders SandbergAnders Sandberg

10.6k21532

answered 19 hours ago

Anders SandbergAnders Sandberg

10.6k21532