Take the 2-minute tour ×
Astronomy Stack Exchange is a question and answer site for astronomers and astrophysicists. It's 100% free, no registration required.

I wanted to ask a question; it's simple but I cannot find any possible and perfect solution.

Earth has poles, North and South. By which we can get directions using a compass or a needle compass, but that's not the concern.

My Question:

Would the Moon cause a change in the magnetic field of Earth when they are interpassing or colliding with each other, as the Moon does come between the magnetic path of the Earth.

So would the Moon's magnetic field affect the Earth's magnetic field, just as its gravitational pull affects Earth's gravitational pull for oceans?

share|improve this question

2 Answers 2

up vote 9 down vote accepted

So would the Moon's magnetic field affect the Earth's magnetic field, just as its gravitational pull affects Earth's gravitational pull for oceans?

Yes, but only slightly. Firstly, magnetic fields can superimpose, so the field at any point is the sum of the field due to the Earth and the field due to the moon.

However, the moon is rather far away (and has a weak magnetic pole strength), so the magnetic field due to the moon on Earth's surface is nearly negligible (magnetic field also decreases as an inverse-square law)

In addition, the magnetic field of the Moon may bolster or erode the Earth's field as magnets moving relative to each other tend to either lose magnetization or become stronger. But this process has a negligible effect when we take the Moon and Earth.

share|improve this answer
    
How does the moon even have a magnetic field? I thought you had to have a churning liquid core for that? –  Scottie Nov 7 at 23:32
    
@Scottie the moon does have a molten core, though it is not rotating anymore IIRC. However, it rotated in the past magnetizing the crust. –  Manishearth Nov 8 at 7:31

As to date there is very little evidence of magnetic influence of the moon as Bouglar anomalies are capable of showing

share|improve this answer
2  
Hi, Colin, welcome to Astronomy. At the moment, this isn't too clear. Can you expand it a bit? –  HDE 226868 Nov 7 at 20:46

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.