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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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Why is the angle of declination greater at higher latitudes and lower near equator?

Why is the magnetic angle of declination greater at higher latitudes? If I take a point 'Q' on the Earth's surface as in this figure: (I edited this picture off the internet, so the plane isn't very ...
Mel's user avatar
  • 133
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44 views

How can auroras be visible at lower latitudes when a strong solar wind hits Earth?

Auroras are a product of electrically charged particles hitting Earth's atmosphere at the poles, where the geomagnetic field is weaker (where magnetic lines originate). How can a strong solar wind ...
jack_O'Dim's user avatar
1 vote
2 answers
118 views

Is it plausible that Earth's magnetism can induce heart attacks by affecting red blood cells? [closed]

https://ui.adsabs.harvard.edu/abs/2014cosp...40E1114G/abstract#%3A~%3Atext%3DIt%20was%20shown%20statistically%20that%2Ccomparison%20with%20quiet%20geomagnetic%20conditions This study says that on ...
Malcom's user avatar
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Range of Geomagnetic Levels

What would the range of geomagnetic levels need to be so that Utica is within the oval of the Aurora Borealis while Albany is not?
Halvin McCobbes's user avatar
9 votes
3 answers
2k views

Why is aurora borealis circular in shape when viewed from space?

These are some false color images of the northern lights captured by NASA's satellite Dynamics Explorer-1. Image credits: Dynamics Explorer - 1 (DE-1) Spin-Scan Auroral Imaging (SAI) Photo Gallery It'...
AlphaLife's user avatar
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7 votes
1 answer
3k views

Why does the Earth's magnetic field have an angle of 11.5°?

Does anybody know why the magnetic field of the Earth have an angle of 11.5°? According to a theory by Prof. Blackett, Earth has magnetism due to the rotation of the the Earth about its own axis. (...
Aarav Raj's user avatar
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1 answer
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Is Earth's magnetic moment vector oriented parallel or antiparallel to the sun's magnetic moment?

Just curious how these two magnets are spatially related to? And in case there is no any special preferred particular orientation, what is anyway their spatial orientation relation (relative angles)? ...
Markoul11's user avatar
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2 votes
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How are multipolar expansion of earth magnetic field computed?

In the study of the geomagnetic field, an expansion in spherical harmonics is used to represent the scalar magnetic potential: the first terms give the dipole approximation, then the quadrupole, etc. ...
Weier's user avatar
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2 votes
1 answer
131 views

Do the currents of charged particles captured by Earth's magnetic field create their own magnetic fields?

Let me try to illustrate what I mean. Consider e.g. a Solar radiation storm (Solar particle event) where high-energy protons are hurled at Earth from Solar flares. I've tried to illustrate my ...
Outis Nemo's user avatar
5 votes
2 answers
324 views

Quantitatively, how much would radiation levels increase without the geomagnetic field?

Many, many popular science articles claim that if the Earth didn't have a magnetic field, then the much higher concentration of cosmic rays that reached the surface would cause health damage to humans....
tparker's user avatar
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Is there a difference between the Earth's magnetic field and an applied magnetic field?

I want to use the HMC2003 3-Axis Analog Magnetometer and the manual says that it only works on applied magnetic fields like a permanent magnet so is there a difference between that and the earth's in ...
Xxx's user avatar
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Influence of magnetic field of earth

Is the magnetic field of a bar magnet influenced by the magnetic field of the earth. If so, will the magnetic field of bar magnet be different in a region where there’s no other magnetic field.
Jason's user avatar
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4 votes
5 answers
543 views

Why is Earth's magnetic field not strong?

Why is Earth's magnetic field not as strong as the magnetic field that is artificially produced even though Earth's magnetic field is produced from an iron core that is very large? Wouldn't more iron ...
Roghan Arun's user avatar
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What is the maximum possible averge power of the geomagnetic electric generator?

Earth's magnetic field strength varies from 25 to 65 μT on the surface. Therefore, magnetic energy is approximately $V\frac{1}{2} \frac{B^2}{\mu\mu_0} \approx 10^{\left (17,5\cdots 18,5 \right )} \...
Imyaf's user avatar
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2 answers
3k views

Is there a difference in Earth's magnetic field between day and night?

Is there a difference in Earth's magnetic field between day and night? Magnetic Field
Origin's user avatar
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What is ohmic decay and why does it happen in magnetized celestial bodies like stars and pulsars?

I've seen term "ohmic decay" mentioned in several papers (example) regarding the decay of magnetic fields in celestial bodies like planets, stars, and pulsars, but I can't seem find a clear ...
arbodox's user avatar
2 votes
2 answers
74 views

Why is modelling the Earth as having geomagnetic poles useful?

I'm reading about geomagnetic poles and wondering what their signifcance is. It seems one (and perhaps the main) purpose of using this type of model is for understanding the aggregation of magnetic ...
Rory McDonald's user avatar
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1 answer
60 views

Have there been any experiments in which the Earth's electromagnetic field was used to do work?

Simply speaking using faraday's law to generate electricity with the use of earth's magnetic field. I'm not talking about some revolutionary new way of generating electricity that would end our energy ...
ALK003's user avatar
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0 answers
17 views

Whys is that the zonal (axisymmetric) magnetic field components of Saturn, Bϕ(longitudinal component taken to be ZERO

In a paper while calculating the magnetic field of Saturn longitudinal/azimuthal component is taken to be zero. why, has this to do with the dynamo model ?
Lunthang Peter's user avatar
0 votes
1 answer
1k views

Would a Magnetic Polar Shift change the location of the Earth's Axis, and thus change the locations of the continents

Did a Magnetic Polar Shift cause the sahara forest to become a desert, because it shifted the location of Africa? Will it cause the continents to shift closer or farther from the equator, causing ...
Brian Durden's user avatar
1 vote
1 answer
245 views

Magnetism in the original Cavendish Experiment (1798)

This is what Henry Cavendish writes on page 490 here My next trials were, to see whether this effect was owing to magnetism. Now, as it happened, the case in which the arm was inclosed, was placed ...
zeynel's user avatar
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1 vote
1 answer
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Is it generally accepted that Field Aligned Currents are caused by Force-Free Fields?

I am currently an undergraduate working on a project about FAC (Birkeland Currents) and it seems that most of the sources on the subject are very technical and hard for me to read (particularily ...
Ilya Iakoub's user avatar
-1 votes
1 answer
126 views

Ideas for levitation using Earth's magnetic field and mu-metal [closed]

I'm not sure the idea works or not. Please answer it and its reason. As shown in Figure 1, when the ASTM A753 Alloy2 magnetic shielding alloy is exposed to an external magnetic field, the applied ...
Bak Haneol's user avatar
1 vote
0 answers
33 views

Paleo-magnetism for the solar system over millions of years from the widmanstatten pattern?

I understand that the widmanstatten pattern (long fingerlike crystalline structure of iron nickel meteorites) is due to a slow cooling and solidification of asteroids over tens of millions of years. ...
R. Rankin's user avatar
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8 votes
3 answers
167 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 ...
Protozoan Panhandle's user avatar
3 votes
1 answer
305 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 ...
Johann Wagner's user avatar
0 votes
1 answer
76 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?
Luffy's user avatar
  • 17
2 votes
4 answers
371 views

Is it possible to use forces on a current carrying conductor due to Earth's Magnetic field to levitate?

When current is applied, a conductor within a magnetic field feel a force. This is the Lorentz Force. I was thinking if it is then possible to apply as much current on a conductor that it will start ...
Vinicius Araujo Ritzmann's user avatar
75 votes
3 answers
8k 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 ...
Thorondor's user avatar
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1 answer
195 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 ...
SK-the-Learner's user avatar
0 votes
2 answers
3k 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 ...
Clone's user avatar
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0 votes
0 answers
56 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.
Janko Bradvica's user avatar
1 vote
1 answer
43 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 ...
Tobe's user avatar
  • 111
0 votes
1 answer
76 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 ...
user1402154's user avatar
0 votes
3 answers
1k 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 ...
Debakant's user avatar
0 votes
1 answer
58 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 ...
jumpjack's user avatar
  • 178
4 votes
3 answers
5k 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 ...
Shub's user avatar
  • 349
0 votes
2 answers
140 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 ...
fcalt's user avatar
  • 1
-2 votes
2 answers
272 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 ...
imposter's user avatar
  • 1,200
3 votes
1 answer
353 views

Origin of magnetic field of Earth [duplicate]

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 ...
ABC's user avatar
  • 75
4 votes
1 answer
86 views

Is there any observable change in Earth's magnetism to an observer in geosynchronous orbit?

I am in high school, and today my physics teacher was teaching us about the Earth's magnetism. This is the first time I've read about this topic, so take these questions as coming from a complete ...
VVidyan's user avatar
  • 152
0 votes
1 answer
594 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 ...
Doodoo28's user avatar
1 vote
1 answer
209 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 ...
bakka moses's user avatar
2 votes
0 answers
156 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 ...
Md Sabbir Ahmed's user avatar
0 votes
1 answer
59 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!
Aryan Bhardwaj's user avatar
0 votes
1 answer
255 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 ...
Scott Clemons's user avatar
8 votes
2 answers
997 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 ...
Rye's user avatar
  • 548
0 votes
1 answer
122 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-...
inf3rno's user avatar
  • 1,079
-1 votes
1 answer
316 views

Cancelling Earth's Magnetic Field. How effective is Helmholtz's coil?

If there is a pipe of very small radius with electrons moving inside it, and I need to cancel the Earth's Magnetic Field as otherwise it would affect the motion of the electrons (right?). How ...
Khabbab Zakaria's user avatar
-5 votes
1 answer
3k 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 ...
Saikat Das's user avatar