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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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Is Coriolis force necessary for geomagnetism

I understand that the Coriolis force from the earth rotation organizes the current flow in the earth outer core into columns of rotation the axis of which parallel the earth rotation axis. That ...
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5answers
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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 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
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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
29 views

Regarding the $E x B$ 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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2answers
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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
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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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2answers
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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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1answer
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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
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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
23 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
207 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
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1answer
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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
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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
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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 ...
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1answer
248 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
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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
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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
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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?
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Why is the top of the aurora red?

When the solar wind is strong enough, the top part of the aurora appears. It is often red: https://commons.wikimedia.org/w/index.php?title=File%3AAurora_Australis.ogv. The aurora is the product of ...
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2answers
783 views

Venus, Earth and Mars Magnetic fields

Why does Earth have a magnetic field, while it appears that Venus and Mars have none or very little?
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1answer
261 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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1answer
236 views

Does density affect Magnetism

(just a quick thought question for my journal) So if you took a magnet and somehow increased the density would there be a definite increase in the force of the pull or would there be a way for that ...
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2answers
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Why does the Earth even have a magnetic field? [closed]

From my knowledge of magnetism, if a magnet is heated to a certain temperature, it loses its ability to generate a magnetic field. If this is indeed the case, then why does the Earth's core, which is ...
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1answer
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Why can't I use a gyroscope/accelerometer only as a compass?

I am seeing this from the usual smartphone sensors. These sensors (Android here e.g.) take the magnetic field data as input. That is okay, but some phones do not have a magnetic field sensor (they ...
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1answer
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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 ...
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1answer
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Can the magnetosphere penetrate the walls of the ISS (International Space Station)?

I'll assume that compared to the size of the ISS, the geomagnetic field is uniform over a small region. In that case, could that magnetic field be measured inside the ISS? To illustrate the question:...
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1answer
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Why do conductors moving in Earth's magnetic field not create electricity? [duplicate]

if earth is a magnet and there are conductors moving in it why do we not get a current from them, seeing as it is a conductor moving in a magnetic field
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2answers
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How solidified lava helped find the history of Earth's magnetism?

I came to know that the earth's magnetic axis is shifting, and a proof to this involves analysing the solid lava found near volcanoes for centuries. How does lava analysis help in finding the shift ...
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1answer
166 views

Is it possible to “override” the Earth magnetic field locally? [closed]

For a mobile application I am developing I would like to know which direction the phone is facing. In the outdoor we can of course use the magneto meter in combination with a gyroscope. However, ...
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2answers
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Why would the North Magnetic Pole (dip pole) of the Earth be well-defined (uniquely determined)?

Strongly inspired by the current thread Are there necessarily always at least two points where the Earth's magnetic field is vertical?, this is the opposite question: Is there necessarily always at ...
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3answers
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Why doesn't the Earth's magnetic field affect electronics?

Why doesn't the Earth's magnetic field affect electronics in the same way that a magnetic field affects/exerts a force on a wire with a charge at a perpendicular angle? Isn't that why electric motors ...
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2answers
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Does weight affect the Earth's magnetic field?

Does the weight of a city influence the earths magnetic field, sort of like you can crush a magnet by putting more weight on the magnet then it can handle, for example an extremely heavy hammer?
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1answer
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How big of an impact does the Earth's magnetic field have on us? [closed]

How big of an impact does the earth magnetic field have on us?
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381 views

How would look the Aurora on earth like if there wasn't a magnetic field?

Suppose the earth wasn't surrounded by a magnetic field. How would the Aurora look like? Would we see a sky full of colored star-like lights, with the color dependent on the energies of the incident ...
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1answer
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What is the origin of the ring current in the Earth's magnetosphere?

Is ring current caused by gradient-curvature drift? I can't find a website that explicitly says that, they just call it 'longitudinal drift' and don't specify the mechanism, which I assume is ...
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2answers
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is there any possible way of creating a miniature version of earth's magnetic field?

if yes then can we deploy it on spacecrafts etc to carry out deep space exploration which we are currently avoiding fearing solar flares ,cosmic waves etc because such magnetic field would surely do ...
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4answers
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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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How do I estimate the probability of a Carrington-level coronal mass ejection (CME) hitting the Earth?

I have seen some material which estimates the probability of Earth being struck by a Carrington-level CME over some time into the future. These estimates seem to be derived from historical data of CME ...
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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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1answer
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Do a bar magnet's and Earth's north magnetic poles have the same polarity? [closed]

Are the north magnetic pole of the earth and the north pole of a bar magnet of the same polarity? Please Explain. I don't seem to understand the question.
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Are North/South Poles on a magnet really the opposite of what they are called?

I am currently revising for my mock GCSEs this March and, going over the topic on Magnetism, I am a bit confused as to the N/S Seeking poles. If it is the North Seeking Pole then does that mean that ...
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1answer
297 views

Jump Rope Generator

Is it possible to generate electricity, however inefficient, by swinging a long extension cord connected to a circuit along Earth's magnetic field like a jump rope?
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2answers
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What is the affect of rotation on magnetic poles?

I was wondering why the earth's magnetic poles are so close to the rotational poles. The magnetic north pole is currently about 500km from the true north pole. That is pretty close in the scale of the ...
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1answer
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What conditions are necessary for Birkeland currents to form?

If charged particles flow through non-magnetised space will they form Birkeland current? Or can such currents only form along existing magnetic field lines? Part of the reason I ask is this: http://...
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What started the magnetic field of Earth [duplicate]

The Dynamo theory gives a good explanation of the magnetic field of the Earth: the Coriolis force focus inner currents into current spirals generating magnetic(s) field(s). What I'm trying to ...
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1answer
297 views

Why do the magnetic poles of the Earth get reversed? [duplicate]

It has been confirmed that the magnetic poles of the Earth get reversed , but why should they get reversed in the first place ? Also, why is their pattern of reversal so arbitrary ? Geomagnetic ...
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0answers
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How can neutral conductive fluids create a magnetic field? [duplicate]

It's a standard textbook answer that currents of molten iron inside the Earth create the Earth's magnetic field. Matter, on the supermolecular scale, is electrically neutral. So any magnetic field ...
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1answer
519 views

Will a cone of magnetic material increase the strength of earth's magnetic field?

If it's possible to guide magnetic field lines using a shaped magnetic material(cone) and the increase in magnetic field strength is proportional to the ratio of the areas of the two ends of the cone,...