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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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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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 ...
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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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193 views

Could a magnetic field with a direction opposite the earths be repelled?

Could a magnetic field with a direction opposite the earths repel the earth, or would it have to be of equal force?
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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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971 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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86 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 ...
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1answer
355 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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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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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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1answer
32 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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516 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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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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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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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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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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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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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 ...
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136 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 ...
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144 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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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 ...
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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!
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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 ...
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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 ...
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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 ...
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512 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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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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Earth's core electric charge

Forgive my limited knowledge, but the Earth's magnetic field is created by the conductive liquid in the core and to the best I can tell organizing itself (which means separating charges?). Would this ...
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1answer
16k views

What happens when a compass is taken to the site of magnetic pole of earth?

We know that the direction of compass needle always points towards the magnetic north pole. If we take the compass to the site of magnetic north pole, which direction will the compass needle point?
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657 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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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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3answers
9k views

Rate of Acceleration of an Object Pulled by Magnetic Force

Gravity on earth pulls objects toward it with an acceleration of 9.8 m/s/s on Earth until the object reaches it's max potential free fall speed. (I call this terminal velocity though I think that this ...
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781 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 ...
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Can you build a compass that is attracted to the South Pole?

Was just curious, since all compasses point to the North Pole. South is just the opposite polarity of of North, so it seems very likely, but I've never seen an example of this. Is there any videos ...
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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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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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658 views

How is north defined for any point on the surface of the earth?

While studying about terrestrial magnetism, references were made to north direction, and the geographic meridian and later magnetic meridian defined using that. But what is actually the north ...
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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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337 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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667 views

Could I make a magnetic foam or film by mixing magnetic dust?

I'm a developer and tinkerer more than an academic, and I'm not sure if this question, being more practical and less theoretical, will be welcome or not here. But here goes, with apologies in advance ...
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1answer
622 views

What is the pull force of Earth's magnetic field per square metre on one of the magnetic poles?

I was wondering if anyone knows what is the strength of pull of Earth's magnetic field near magnetic poles. I found that the field strength is approximately 0.65 gauss, but was unable to convert this ...
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885 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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128 views

What did this geophysicist mean? (geomagnetism)

I recently went to Antarctica where we made many shore excursions with Zodiacs. On one of them we visited the Ukrainian Vernadsky Research base on Galindez Island where they conduct geophysics ...
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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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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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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 ...
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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
81 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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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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Position of neutral points

We all know about neutral points, which are nothing but points where the Earth's magnetic field neutralizes a magnet's magnetic field. When the north of a magnet faces geographic north, then the ...