Questions tagged [geomagnetism]

Geomagnetism covers questions related to the Earth’s magnetic field, its origin, history and measurement. Use electromagnetism for more general questions on magnetism.

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7
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2answers
70 views

To what direction will a compass in a magnetic medium points? The direction of $B$-field or that of the $H$-field?

Question in title. To avoid "same direction" answers, let's assume the B and H are pointing in different direction, i.e., the magnetic permeability is not a diagonal matrix. What direction ...
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1answer
41 views

Description of Van Allen's Belt and Magnetic Mirrors

The "Van Allen Belt" is a region near earth that concentrates a high density of energy particles. The formation of this region originates in a phenomenon called a magnetic mirror, when ...
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1answer
28 views

Earth's magnetic field lines with magnetic compass needle

Will the compass needle deflect in the opposite side inside the earth? If so, where will be that location inside the earth?
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3answers
7k views

Why don't the Earth's oceans generate a magnetic field?

Many questions have been asked here about why the Earth has a magnetic field, e.g., What is the source of Earth's magnetic field? How does Earth's interior dynamo work? How can an ...
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1answer
92 views

What exactly are the 2 points where a magnetic needle becomes horizontal?

Textbooks and websites say: A magnetic needle rests making different angles with horizontal when suspended at different places of the earth In the explanation, they say that the magnetic needle ...
0
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1answer
380 views

Is Earth's North pole actualy a South pole?

As far as I am concerned, the compass is facing along the magnetic field lines on the Earth's surface which in turn points towards the North pole by its design. But for a magnet, the field lines go ...
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0answers
26 views

Will a neodymium magnet levitate on ice at Earth's North and South Pole?

Will a neodymium magnet levitate on ice at NP or SP? Asking just because these magnets are powerful and the Earth magnetism is fairly stronger at poles than at the Equator.
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1answer
37 views

Does the Earth's magnetic field reversal and the corresponding magnetostrictive stress and strain make any contribution to the Earth's oblateness?

If the changing magnetic field in a power grid's transformer can induce stress and strain on the transformer core, then can the changing magnetic field of the Earth, similarly, place stresses and ...
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1answer
34 views

Ferromagnetic field near a ring in Earth's magnetic field

Let's say I am trying to find out the effect that an iron ring has on the Earth's magnetic field (approximated to a uniform field at infinity). Can I solve it in 4 steps: Find the magnetic field due ...
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3answers
528 views

Tilting of Earth rotational axis

In which way do the Earth's rotational axis tilted 23.5°. see in the image we have been told that the axis of rotation of Earth is tilted 23.5° from the perpendicular to path. But can anyone say in ...
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1answer
53 views

What will pole reversal cause to modern world and civilization?

I don't think it's just a matter of reorienting maps and recalibrating compasses. In any case, how long does a inversion last? hours, days, weeks, years? If it lasts days or more.... would Sun fry ...
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3answers
339 views

Magnetic, geographic and geomagnetic poles

Can someone explain me in simple terms where and what are the magnetic, geographic and geomagnetic poles? Some sites say that magnetic north pole is in the south and thus it attracts the south pole ...
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2answers
32 views

Magnet size vs field strength

Why is a compass not significantly affected by nearby (less than a couple meters) powerful magnets (such as those located inside home appliances and electronics) given Earth's magnetic field is just ...
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2answers
128 views

Does magnetic field exist throughout space?

My question is quite subjective and I could not find a suitable explanation to whether there is a magnetic field in space beyond earth .I read one of the article stating Interstellar dust clouds have ...
3
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1answer
139 views

Origin of magnetic field of Earth

I have a hard time understanding why does earth have magnetic fields. My textbook reads: "The Earth's core is very hot and molten, and the ions of iron and nickel are responsible for Earth's ...
0
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1answer
184 views

How do we know what the dipole moment of "The Earth Magnet" is?

It is given in my textbook and one other book(that I got from the library) that:- ...The earth has a magnetic dipole of dipole moment about $8.0\times 10^{22} \mathbf{ J.T^{-1}}$ The book doesn't ...
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1answer
80 views

Will superconductor levitate on Earth magnetic field?

We know the earth has both gravity and magnetism (which is very weak). Geomagnetism starts at the south pole and ends at the north pole. If I take a large sheet of superconducting material (very thin ...
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0answers
109 views

Can Earth's Magnetic Field Be as Less as -85μT and as Much as +70.46μT?

What did create the question? I was analyzing a data set where the researchers have used objective data. They have calculated earth's magnetic field through sensors and that research was conducted in ...
0
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1answer
36 views

Why does a steel bar buried inside earth exhibits magnetic property? What will be the effect on it if we put it on the surface of the earth?

I'm thinking that it is because the magnetic field inside the earth is stronger than it is on the surface. Please correct me if I am wrong and give detailed solution. Thanks!
0
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1answer
52 views

Low orbit space debris affects magnetic field? [closed]

Theory reduce earth temperature by removing low orbit junk and consolidating needed satellites With all the space junk in low orbit, we effect both earth's magnetic field by moving metals into the ...
8
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2answers
524 views

How do rocks store information about Earth's magnetic field?

When a particular rock is being formed in a rift (by the solidification of magma, which is composed of ferromagnetic materials), the rock "stores information" about the Earth's magnetic field at the ...
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1answer
56 views

How does the aurora brightness depend on the distance from the poles?

I checked a few sites about aurora: http://www.aurora-service.eu/aurora-school/all-about-the-kp-index/ https://www.swpc.noaa.gov/products/aurora-30-minute-forecast https://www.swpc.noaa.gov/products/3-...
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1answer
743 views

Difference between Earth's magnetic field and Earth's gravitational field [closed]

I have a misconception about this. Are these really different? If so then how? And one more problem is that, whether satellites orbit around the Earth because of Earth's Magnetic Field or Earth's ...
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3answers
3k views

Earth magnetic field space elevator. No cable [closed]

I have an idea that the space elevator can be build in the following conditions: Not a classic theory. No cable. No Geostatic orbit. Not equator platform position The possible platform / base ...
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1answer
122 views

What causes the vertical bands of light in an aurora?

I was lucky enough to witness a medium-strength aurora recently in Iceland (KP ~3). We saw the classic rippling arc of green light, which at times seemed to consist of smaller flickering vertical ...
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1answer
39 views

Why Earth's magnetism changes rapidly recently?

The magnetic north pole is wandering near Canadian coast. The rate of pole wandering increased recently. Which factors causing these?
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3answers
347 views

A strong neodymium magnet has no effect whatsoever on my phone compass. How is that possible?

If I hold a strong neodymium magnet near my iPhone while the compass app is running, there is no effect whatsoever on the compass bearing. It doesn't matter where I hold the magnet in relation to the ...
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2answers
975 views

How does the Earth's magnetic field protect it from the solar wind?

Several sources (see linked questions at the end) say that earth's magnetic field shields us from the solar wind. The general consensus is that without earth's magnetic field, the atmosphere would be ...
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3answers
1k views

How can a refrigerator magnet be stronger than the Earth's magnetic field?

This Wikipedia page lists examples of magnets and magnetic fields of different strengths. I don't understand why it claims that the Earth's magnetic field is less strong ($31.869 \ \mu\text{T}$) than ...
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2answers
347 views

What is the sign convention in determining magnetic inclination in northern hemisphere?

I am finding a problem in understanding the sign convention associated with measuring the dip angle (Magnetic Inclination) in southern and northern hemisphere. I have tried to consult this matter on ...
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1answer
896 views

Size of electromagnet needed to replicate Earth's magnetic field

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 ...
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5answers
2k views

Why magnetic field starts from north pole and ends in south pole? [closed]

In magnets such as bar magnets the magnetic field lines are starting from North pole and ends in south pole..but I don't know what is the reason for it..why this happens.
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0answers
371 views

Why doesn't the Earth lose its magnetic properties? [duplicate]

I learnt in junior high that magnets, when exposed to heat, usually tend to lose their magnetism. Similarly, the Earth's core is also hot, but it doesn't lead to the loss of magnetism of Earth. Am I ...
3
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0answers
55 views

How does a liquid state in Earth's inner/outer core allow a magnetic field? [duplicate]

I'm pretty sure metal loses more of its structure as it heats up and magnetic properties in a material are caused by a particular combination of atomic arrangement and orbital levels so...how does the ...
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1answer
83 views

How does a compass work?

When using magnets, How does a compass determine the quantitative value of the magnitude and the direction of the magnetic field?
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2answers
169 views

Regarding the $E × B$ drift in the Earth's magnetic field

So I have a burning question: The only reason that the E x B drift doesn't generate an electric current is because both the electrons and the positive ions move towards the same direction (towards ...
2
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2answers
114 views

How does the Earth's inner core gets heated?

According to some references, it is said that the Earth's inner most layer gets heated up and exists in a solid form due to Earth's pressure. But how does that inner-most core get heated?
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5answers
661 views

Why does the Earth not lose its magnetism?

A magnet loses its magnetic properties when subjected to heat, the Earth's core is also hot but still it has magnetic properties, Why?
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2answers
852 views

Need help in finding error in calculation to find Earth's magnetic field strength using Galvanometer

I am working on a experiment on finding the Earth's magnetic field strength. Using a Galvanometer and a constant power source of 5.1V and slowly adjusting the resistance, I was able to find the ...
3
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1answer
253 views

Distortion of the Earth's magnetic field due to solar winds?

Why and how do the solar winds distort the Earth's Magnetosphere to form a drop like shape facing away from the Sun?
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1answer
34 views

Have any experiments been performed on the magnetic properties of neodymium at high pressure and temperature?

As probably everyone here knows, the magnetic property of neodymium disappears at temperatures above ~590°F (310°C) depending on the mix of alloys. Have there ever been any experiments performed to ...
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1answer
53 views

Could planetary magnetic fields repel each other?

If two planets with magnetospheres approached each other, would they repel or attract?
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1answer
376 views

What happens if Earth loses its magnetic field?

Earth's magnetic field is shifting at a high speed does this mean earth will lose its magnetic field and if it does are we in danger or if it doesn't what are consequences of the poles shifting
0
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1answer
82 views

What would happen to electricity if earth's magnetic field reversed? [closed]

In particular, what would happen to our communication system? Is there a way to recreate it? Is there any intrinsic difference and difficulty within the process? I mean: can you simply 'reverse' ...
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1answer
102 views

Would the effects of a Coronal Mass Ejection be magnified in the South Atlantic Anomaly area?

The South Atlantic Anomaly is an area where the Earth's inner Van Allen radiation belt comes closest to the Earth's surface, dipping down to an altitude of 200 kilometres. This causes one of the ...
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2answers
361 views

Why Earth is like a magnetic dipole?

Earth’s magnetic field is mostly caused by electric currents in the liquid outer core, which is composed of conductive, molten iron. Loops of currents in the constantly moving, liquid iron create ...
0
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1answer
526 views

Why Earth’s magnetic field is reversing its direction every few million years? [duplicate]

Just now I was studying the Magnetism and Earth's magnetic field source. when I read that the earth's magnetic poles are not fixed and keep changing ( the north becomes south and the inverse) every ...
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1answer
6k views

Vertical component of Earth's magnetic field

What is the direction of vertical component of earth magnetic field is it upward or downward?
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1answer
34 views

Why do we get a coloured spot on TV while dragging a bar magnet near the TV? [duplicate]

Why do we get a coloured spot on old crt TV while dragging a bar magnet near the TV?
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3answers
90 views

Electromagnetism magnetic field line [closed]

What is the direction of the magnetic field of the Earth? From north to south or from south to north?