Questions tagged [geomagnetism]
Questions regarding the magnetic field emanating from Earth's interior.
69
questions
2
votes
0
answers
37
views
Does oxygen propagate towards stronger magnetic fields on Earth?
I noticed Earth has variations in gravity similar to focal points for magnetic fields, both macro and micro in size, caused by magnetic material deposits. With oxygen being attracted to magnets, I ...
- 139
0
votes
1
answer
62
views
Do gravity and magnetic field change along a geographic latitude or not?
Along the same geographic latitude does magnetic field change or not, and the same for the gravitational field, does it change along a geographic latitude? Please explain.
2
votes
3
answers
129
views
How can there be zero magnetic declination in places where the magnetic and geographic poles don't line up
Here's a global map of magnetic declination:
How can there be zero magnetic declination in places where the magnetic and geographic poles don't line up (which is only at approx. latitude 0 and 180 ...
- 23
1
vote
0
answers
2k
views
Safest place on Earth during the pole shift
Where is the safest place on Earth in relation the magnetic poles as it is moving that will provide the most protection against solar radiation? I imagine the topography may effect the magnetic fields....
- 139
2
votes
1
answer
46
views
Earth magnetic field, WMM/IGRF
My question is about World Magnetic (WMM) and International Geomagnetic Reference Field (IGRF) models. It is well known that to a first approximation, earth magnetic field is a field of dipole. It ...
2
votes
0
answers
49
views
Airborne geophysical survey in steep and undulating terrain. What is more important, energy conservation or orienting lines wrt to geology and why?
I am trying to design a cost and energy efficient aerial survey and have come up against the question, 'do we have to fly straight lines perpenducular to geology?' as not doing so could make for a ...
- 121
4
votes
1
answer
64
views
Can paleomagnetic techniques determine the exact direction of Earth's magnetic poles in the past, not just their polarity?
Since our planet's magnetic poles are not usually, precisely, lined up with the geographic poles of Earth's axis, and since they move around a lot, can paleomagneticists (is that a word?) determine ...
- 755
2
votes
1
answer
60
views
How accurate are paleomagnetic orientation measurements?
I am curious what the modern accuracy for paleomagnetic azimuthal orientation measurements are. Let's say for a magnetite grain, is the orientation of the magnetic moment for a single crystal resolved ...
4
votes
1
answer
194
views
Why do electrons drift Eastwards in the Van Allen belts?
Context
The image below shows that one of the three particle movement patterns of radiation particles that are captured in the Van Allen belts is a longitudinal drift motion:
However, I am ...
- 143
1
vote
1
answer
45
views
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 ...
- 113
4
votes
1
answer
320
views
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 ...
3
votes
1
answer
440
views
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 ...
user20559
4
votes
1
answer
358
views
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 ...
- 41
1
vote
0
answers
31
views
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 ...
1
vote
0
answers
39
views
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 ...
2
votes
1
answer
159
views
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 ...
- 7,074
4
votes
1
answer
78
views
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 ...
- 41
1
vote
0
answers
57
views
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 ...
user20559
2
votes
1
answer
550
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 ...
- 23
1
vote
0
answers
53
views
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 ...
2
votes
0
answers
141
views
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 ...
- 660
3
votes
1
answer
201
views
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, ...
- 7,074
3
votes
4
answers
375
views
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 ...
- 7,074
5
votes
0
answers
98
views
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 ...
- 7,074
5
votes
0
answers
80
views
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 ...
- 7,074
8
votes
1
answer
686
views
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-...
- 7,074
7
votes
2
answers
312
views
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 ...
user18607
2
votes
1
answer
124
views
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 ...
- 334
3
votes
3
answers
552
views
If the Earth's core were made up of copper/other metals other than iron-nickel alloy, what would the magnetosphere be like?
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....
- 133
2
votes
1
answer
558
views
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 ...
- 1
-1
votes
1
answer
128
views
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 ...
- 15
1
vote
0
answers
82
views
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 ...
- 1
6
votes
1
answer
849
views
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 start ...
- 1
11
votes
2
answers
761
views
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 ...
- 7,074
2
votes
1
answer
330
views
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 ...
- 29
10
votes
2
answers
497
views
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 ...
- 7,074
3
votes
1
answer
137
views
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 ...
- 1
13
votes
3
answers
2k
views
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 ...
- 17.6k
7
votes
2
answers
278
views
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 ...
- 71
1
vote
0
answers
23
views
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 ...
- 1
11
votes
2
answers
3k
views
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/...
30
votes
2
answers
21k
views
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?
- 1
2
votes
1
answer
93
views
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 ...
- 635
6
votes
1
answer
211
views
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 “...
user11318
2
votes
0
answers
113
views
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'...
2
votes
1
answer
507
views
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 ...
- 121
3
votes
1
answer
297
views
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 ...
- 1,487
5
votes
0
answers
85
views
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 ...
13
votes
2
answers
3k
views
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 ...
7
votes
1
answer
5k
views
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 ...
- 205