Questions tagged [geomagnetism]

Questions regarding the magnetic field emanating from Earth's interior.

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How to interperet audio magnetotelluric results?

I'm newbie in filed of Geophysics science. I will be grateful if you could help me to understand this chart what does line 12 or Line 11 mean? what about line15-14? How to identify the depths? what ...
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Does the magnetic field really protect Earth from anything?

Many topics discussed here in Earth Science SE, tend to be about facts that are of consensus in the scientific community but not widely accepted by the general public. Instead, this one is widely ...
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IGRF -13 Geomagnetic field, Calculating Partial Derivatives of Legendre Polynomials

I have been trying to implement the IGRF-13 geomagnetic model on my own in C code. I have followed the equations from the website below and I am getting correct results for the B$_{\phi}$ and Br ...
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How do I find the Datum (Diurnal Correction) number for a Magnetometer

I’m a new prospector who was given the task of learning a GEM GSM-19T Proton Magnetometer. I’ve learned how to set it up, take base readings, and take walking surveys. However when setting up a base ...
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When will the Earth lose its magnetic field?

Mars lost its magnetic field 4.5 billion years ago according to this article: Mars lost its global magnetic field during the time of this heightened activity. After 500 million years, the Martian ...
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If all liquid stuff inside the Earth turned solid, what would be the effect?

There are parts inside the Earth (near the core) that are liquid. Presumably causing the Earth's magnetic field (though there are celestial bodies that are completely solid while they have a magnetic ...
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Can changing magnetic fields or a solidifying core cause the Earth to rotate faster?

I had a small quarrel about this on the physics site. A question was asked about what could cause a change in the rotation speed of the Earth. In addition to the answers given I proposed the ...
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1answer
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Derivation of Geomagnetic field lines (after interaction with solar wind)

I understand that without the solar wind, the Geomagnetic field would essentially be that of a dipole. With the presence of the solar wind, this field is distorted, as can be seen in many images that ...
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Plain-language summary of why Uranus and Neptune are different than Earth in having large offsets of their dipole field?

This answer to Why is the magnetic axis of Uranus and Neptune off center? in Astronomy SE perplexes me, partly because I can't understand the block quotes and partly because they constrast those ...
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Extinctions and geomagnetic inversions [duplicate]

The article Did the Earth’s magnetic field affect our evolution? on Pledge Times cite this Science paper to assert: These authors speculate that, in the Pleistocene, large mammals could have reached ...
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4answers
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Do we know anything about the nature of Earth's core that hasn't come from magnetic or seismic measurements?

There is much known about Earth's core from painstaking analysis of seismic data, and from detailed magnetic field maps and trends over time. Are there any other measurements that have contributed to ...
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185 views

Recursion relations of Associated Legendre Polynomials with Schmidt Semi-normalization

Can someone please provides me with the recursion relations of Associated Legendre Polynomials when using Schmidt quasi-normalization? I need that in the context of Geomagnetism to obtain the ...
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Does a geomagnetic storm visibly deflect a compass?

Reading Solar Storms Could Confuse Whales and Cause Mass Strandings and the linked open access paper in Current Biology Gray whales strand more often on days with increased levels of atmospheric radio-...
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More iron = Less remanent magnetic field

I am aware that iron is a magnetic mineral and through the process of thermoremanent magnetization it can store a record to the state of magnetization it formed in. I wanted to ask if there are any ...
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How could the solar wind cause strange magnetic pulses on Mars at midnight?

24-Feb-2020 NASA News item A Year of Surprising Science From NASA's InSight Mars Mission says: A new understanding of Mars is beginning to emerge, thanks to the first year of NASA's InSight lander ...
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What "blobs" of molten material in Earth's interior are responsible for the rapidly moving north pole? Where are these blobs exactly?

IFL Science's Earth's North Magnetic Pole Is Heading Towards Siberia – And Scientists Now Know Why explains that the motion of Earth's north magnetic pole can be understood as follows: A new study, ...
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What is the relative (magnetic) permeability of the Earth? How could it be measured?

I believe, Earth could be approximated by a molten, metallic, non-magnetic sphere, with a molten stony sphere around it. However, As far I know, the magnetic properties of the lava in the crust, in ...
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Mars' strange magnetic pulses at midnight; besides the solar wind what are other possible causes?

24-Feb-2020 NASA News item A Year of Surprising Science From NASA's InSight Mars Mission says: A new understanding of Mars is beginning to emerge, thanks to the first year of NASA's InSight lander ...
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What happens when the North and South poles flip?

How long does it take the magnetic field to move once the poles start to flip? What environmentally would change? Does the core of the Earth flip? The magnetic poles are moving now. When will it ...
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Is there evidence of multiple poles (higher order than dipole) in earth's magnetic field?

There is this slightly uncombed simulation model of a geomagnetic field reversal, showing multiple poles, a quadrupole or even higher order magnetic field. Earth's magnetic field is mostly described ...
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What is the strength of the Earth's magnetic field at McMurdo Station, Antarctica?

Based on this map, Below are images showing more specific detail. I assume the field strength is between 0.6 gauss and 0.65 gauss, but I cannot tell between which ios-flux lines (if that is a ...
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230 views

If the earth's core is made up of copper/other metals other than iron-nickel alloy, how our magnetosphere will be?

We know that our earth's core is made up of iron-nickel alloy and it is spinning to create magnetic flux all around our planet to create our life-saving Magnetosphere. And this also influences our 9.8 ...
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Laboratory simulation of the Earth's magnetic field

I remember reading an article where a scientist was able to make a spinning iron tube with liquid nickel inside and it created a magnetic field, providing a laboratory-scale simulation of the ...
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How would our weather change in the event of a magnetic pole shift?

Every two hundred thousand years or so the magnetic poles flip. Obviously it is not life ending but how would our weather change? How long does the transition take? Is there a map or model to show ...
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Where on Earth is the magnetic field intensity stronger?

Are there places on Earth that have a strong magnetic field other than the magnetic north and south poles? Can living where (rare) earth magnetic ore is abundant provide a mini-magnetoshere?
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Does Magnetic Deviation depend on altitude?

Magnetic declination, sometimes called magnetic variation, is the angle between magnetic north and true north. Declination is positive east of true north and negative when west. Magnetic ...
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What portion of global warming is caused by radioactive CO2 produced from cosmic rays?

The Earth's magentic field has been weaking recently, and the sun's magnetic field has been weaking recently, and it is a known fact that when either of these magnetic fields weaken (let alone both of ...
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Can we predict the rising temperature of Earth?

Where can I find a model of Earth's past climates and future projections from combined possibilities like magnetic pole movement and other forms of global warming as a map? Without a reference it has ...
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1answer
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Lights associated with earthquakes?

According to the New Madrid, Missouri web site, during the 1811-1812 earthquakes there were reports of lights coming from the ground due to quartz crystals being squeezed. They call this phenomena “...
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What is the nature of the "unexpected geomagnetic pulse that took place beneath South America in 2016"?

Popular news has several articles linking back to the news article in Nature Earth’s magnetic field is acting up and geologists don’t know why which discusses the need for an early update to the World ...
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Is there a "submerged object" in Australia that causes a magnetic deviation of 20 degrees?

This answer quotes this blogpost as an example of a magnetic anomaly: Basalt formation, “Mt. Jim”, in remote north-east Victoria, Australia, has a magnetic anomaly -20 degree magnetic compass ...
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Why are pole reversals not more detrimental to life?

This question is linked to the following question, and has two parts. Mars interdicts approximately 40% of the radiation (per square meter) of the sun that Earth does. It has been claimed that Mars ...
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Does solar wind perturb Earth's magnetic field ? If so, what are the consequences?

The Earth's magnetic field makes continuous battle with external disturbances to protect Earth from unwanted ramifications. Asteroids passing by, solar flares, and other ET disturbances may cause ...
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Is it possible for Earth to experience Polar Shift?

Many accounts claim that the Magnetic Field of the Earth has been seriously degrading for the past centuries and we are currently in the process of the so called Polar Shift. How likely would it be ...
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1answer
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How does liquid iron create a magnetic field?

I'm pretty sure metal loses more of its structure as it heats up, so...how does the difference in rotation of Earth's liquid inner and outer core generate any kind of magnetic field? Why wouldn't the ...
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1answer
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How close to the magnetic poles will a compass be accurate?

So the Earth has a giant magnetic field we use to determine direction. The field roughly looks like a magnetic dipole, but because the field is generated by a turbulent liquid dynamo near the Earth's ...
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Does the strength of Earth's magnetic field influence its climate?

The strength and orientation of Earth's magnetic field varies with time. Does this variation of the magnetic field have any influence upon climate? For example, is there any correlation between ice ...
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Calculating error in measuring geomagnetic Anomalies using IGRF

In textbooks it is mentioned that Magnetic anomaly = Observed Geomagnetic field - Theoretical Geomagnetic field observed value is measured using instruments like proton precession magnetometer or ...
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Where on Earth is the highest none polar magnetic fields?

Is there anywhere that magnetic ore deposits are strong enough to have a magnetic field that would be stronger then Earths' magnetic poles by proximity? I'm not asking Where on Earth is the ...
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Do living things have a magnetic field capable of any level of solar protection?

I understand how anything with an electrical current have a magnetic field including living things. Would a densely populated rain forest or jungle have enough combined magnetic field among the living ...
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How long does a magnetic pole reversal take to complete?

Geomagnetic pole reversal is a "regular" phenomenon on Earth. Although the interval pattern has been irregular at times (sometimes with millions of years of difference between change intervals), Earth ...
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Is it possible that the geomagnetic field reversal led to the extinction of Dinosaurs?

Is it possible that the geomagnetic field reversal with a weakened geomagnetic field over centuries if not thousands of years (according to the Pittsburgh simulation: https://www.psc.edu/science/...
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Where can I find geomagnetic observations for the Indian Ocean region in 2017?

I am looking for the geomagnetic data for the Indian Ocean region. The 3D data should correspond to longitude-latitude grids at hourly intervals. The model data is easily available at NOAA but I need ...
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Why is Earth's Core Iron?

The two major constituents of the Earth's core are iron and nickel. In documentaries and scientific conversations, iron gets more attention than nickel, probably because it makes up a bigger ...
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What are the arguments FOR Climate Change influenced by the drifting of Geomagnetic Poles? [duplicate]

*Over some years I was hovering over the developments of the ESA SWARM mission and probing random magnetometers from the Russian-Ukrainian observatories as a private researcher and a non-scientist. I'...
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1answer
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Where do the electric charge carriers for the current for earth's magnetic field come from?

I have some trouble trying to understand, why streams and convections in the outer liquid earth core, coriolis forces etc. would create an electric current? Because you probably need an electric ...
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How probable is is that earth magnetic field will change 180 degrees at once?

Today the Earth's magnetic field is moving a little bit. But is there going to be a point where the field suddenly radically changes direction? If so what is the cause of that? If not, then is the ...
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What is the meaning of integral of negative magnetic field (nT) over time?

I have a plot of the magnetic field (y-axis) over time (x-axis), one measure each hour (Dst - Disturbance Storm-Time). From time to time, there is a negative peak, which indicates a magnetic storm. ...
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Are Helium 3 and 4 being produced by earth's core?

J. Marvin Herndon claims that the evidence of the georeactor comes from 3He/4He ratios released to the oceans at the mid oceanic ridges. Georeactor-produced 3He/4He ratios are related to the extent of ...
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Does Earth's magnetic field arise from a fission reactor in its core?

I heard about the georeactor hypothesis (Herndon, 1993), which claims that there is a natural atomic fission reactor in the Earth's core giving rise to the geomagnetic field. Further, Herndon claims ...