All Questions
Tagged with earth magnetic-fields
71
questions
38
votes
4
answers
6k
views
Why is Earth's climate so stable?
Earth wasn't always the only water-world in the solar system. Mars also appear to have started out wet
but, as conditions changed, Mars lost its oceans.
So, how has Earth managed to avoid a similar ...
- 1,139
14
votes
2
answers
4k
views
Does the geomagnetic field rotate?
The Earth rotates about it's own axis. Do the geomagnetic field lines rotate due to this rotation or not?
- 347
13
votes
1
answer
6k
views
How much power would be needed to make a substitute for natural Earth magnetic field?
Imagine the Earth's magnetic field will take a "maintenance pause" for 1000 years and there is a giant 10-year "doomsday countdown timer" ticking in the sky. The magnetic field will be just normal for ...
- 239
13
votes
1
answer
1k
views
Are there necessarily always at least two points where the Earth's magnetic field is vertical?
Seeing this statement in this answer
There are at least two spots on Earth where the magnetic field of the planet is not horizontal, but is vertical.
has got me thinking. I don't mean to quote it ...
- 6,273
11
votes
3
answers
1k
views
How are the northern lights produced?
Although I've never seen it myself, I hear the northern lights are a sight to be seen! I know they're related to the Earth's magnetic field but I don't know much more about them. What is the physical ...
- 1,397
11
votes
6
answers
5k
views
Are metals more heavy due to the Earth's magnetic field?
Non-metal objects are attracted to the Earth due to gravity. So the weight of non-metal objects can be only dependent on their mass.
On the other hand metals can be attracted to the Earth's magnetic ...
- 347
9
votes
2
answers
2k
views
Earth's magnetic field shields us... from what threat?
This is a nice artistic picture of the magnet field of the earth, shielding us from the solar wind. (source)
Wherever you look, it is stated that without our shield, life would not be possible on ...
- 298
8
votes
3
answers
2k
views
How many amperes are flowing in the Earth's core?
To my surprise I couldn't find any estimate on how many amperes of electrical current are flowing in total in the Earth's core to be able to create the magnetic field strength $5\cdot 10^{-5}$ T on it'...
- 6,841
8
votes
3
answers
4k
views
Why does earth's magnetic field change its direction?
I know that the earth's magnetic field is due to molten metal and ions flowing in its core. It has been found that the Earth's magnetic field changes its direction and it has even flipped once!
But, ...
- 3,905
7
votes
2
answers
963
views
Why is the shape and size of Earth's magnetosphere different on both sides?
Two days ago, I watched a documentary about solar flares, and how Magnetosphere protect us from that to earth. I was able to understand most of it, but I'm still curious to know why the Magnetosphere'...
- 235
7
votes
1
answer
10k
views
Why is the geomagnetic north pole at a different location from the magnetic north pole?
According to this site
Magnetic North, Geomagnetic and Magnetic Poles
The Geomagnetic poles (dipole poles) are the intersections of the Earth's surface and the axis of a bar magnet hypothetically ...
- 171
6
votes
2
answers
2k
views
How would the Aurora light on Earth look like if there wasn't a magnetic field?
Here are some pictures of the aurora light.
The beautiful phenomenon of Aurora is a well-known one, seen in the northern (Aurora Borealis) and southern parts (Aurora Australis) of the globe. Here is ...
6
votes
1
answer
2k
views
How is Earth a magnet while it's volume is mostly above Curie temperature?
I was assuming the earth's magnetism is similar to a permanent magnet; But below a depth of somewhere near the Mohorovičić discontinuity (Moho) between earth's crust and mantle it should be above ...
- 3,901
6
votes
1
answer
15k
views
What is the effect of Earth’s magnetic field on airplanes?
As an airplane accelerates through the earth’s magnetic field, it experiences a changing flux $d\phi \over dt$ and a potential difference is induced along its wings.
Given that the wings are made of ...
- 1,546
6
votes
1
answer
713
views
Why is Earth's magnetic field so stable?
This answer explains why the Earth has a magnetic field, this answer explains why the Earth's magnetic field flips.
However, neither seems to answer the question of why the Earth's magnetic field ...
- 1,016