Questions tagged [electromagnetism]
The theory of the electric and magnetic fields, both in the static and dynamic case, in relation of the Earth.
33
questions
2
votes
0
answers
40
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
1
vote
0
answers
25
views
How have Schumann resonances varied in previous eras and periods on Earth?
Schumann resonances vary with losses in the cavity between Earth and the ionosphere and variability of the upper boundary due to atmospheric conductivity and ionospheric dynamics:
BALSER, M., WAGNER, ...
- 111
5
votes
1
answer
394
views
Why is there a window in the absorption spectrum of Earth's atmosphere at a wavelength of 4 μm?
Looking at the Wikipedia page for absorption bands, it seems to me that there's a sizable window - i.e. a local minimum - in the graph for electromagnetic radiation absorption, as per the edited image ...
- 183
1
vote
0
answers
20
views
What does the refractive index static coefficient measure and how is it derived?
From my understanding the refractive index structure coefficient $C_{n}^2$ measures atmospheric turbulence, but I'm not entirely sure as the literature seems to imply that there are slightly different ...
- 51
1
vote
0
answers
30
views
The-nature-of-sar-pixel-value-vs-of-panchromatic-pixel-value
When we compare sentinel-1 SAR orthorectified 8-bit image vs a very high resolution panchromatic 8-bit image, the panchromatic cells are a resemblance of signal amplitude in an 8-bit scale (0-255). ...
- 111
4
votes
1
answer
197
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
0
answers
16
views
Does an increase in SR lead to an increase in strength and intensity of ionospheric lightning?
As explained in the following document:
ELF Electromagnetic Waves from Lightning: The Schumann Resonances
Upper-Atmosphere phenomena like Sprites and Elves can be recorded with extremely low frequency ...
- 271
1
vote
1
answer
64
views
Databases of all Astronomical Geomagnetic storms data
I am doing a project in which I need data from all the globe of geomagnetic storms, I need to ask that from where I can find a list of all sites where I can find the data of geomagnetic storms easily ...
- 111
5
votes
0
answers
89
views
Range of frequencies of the Schumann resonance?
Crossposted at Physics SE
As the surface-ionospheric gap acts as a resonator for electromagnetic waves, it should have several harmonic values from the base, fundamental frequency of 7.83 Hz.
These ...
- 271
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
1
vote
0
answers
75
views
Understanding the EM survey results
I have contour maps showing conductivity and in-phase data from an electromagnetic survey done on a ground, where, supposedly, an underground sewer system is running horizontally across the survey ...
- 21
6
votes
1
answer
167
views
Did Dark Lightning turn out to be a real thing? Is this what produces gamma ray flashes from lightning storms?
The Science at NASA video ScienceCasts: Dark Lightning describes observation of gamma rays from Earth by the Fermi Gamma-ray Space Telescope.
These gamma rays are associated with weather that produces ...
- 7,074
4
votes
2
answers
123
views
If the earth's surface is negatively charged, why aren't objects close to the surface polarized?
A lot of misinformation about earth and it being a sink is spread everywhere, including what I was taught in school, I hope you well-informed folk can help me out.
A sort of side-note, if anyone has a ...
- 41
1
vote
0
answers
65
views
Does Coronal Mass Ejection (CME) affect my eMMC Storage?
I know that earth magnetic field is like a shield for Coronal particles. But it will generate magnetic induction
Is my eMMC Storage vulnerable?
Will aluminium foil protect my data?
alecxs
1
vote
1
answer
297
views
How to measure voltage differential across different altitudes
Imagine two points, one directly above the other.
Point A - 10,000 feet (PA)
Point B - 20,000 feet (PB)
Imagine there's voltage potential between those two points.
Questions:
How could you measure ...
- 131
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
8
votes
1
answer
702
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
1
vote
0
answers
37
views
How do thunderstorms generate ionospheric potential?
In all the explanations of how global electric circuit on Earth works, I've always encountered statements like "thunderstorms generate ionospheric potential" (which is about 250 kV).
E.g. here: https:...
- 11
2
votes
1
answer
149
views
Transmitter receiver coil separation for Electromagnetic Terrain Conductivity Measurement
Why increasing transmitter-receiver coil separation in EM survey (EM31, also here) increases depth of penetration?
Suppose there is a horizontal flat conductive layer underneath a flat resistive ...
- 21
1
vote
0
answers
58
views
Electric permittivity of quartz
I'm performing an educational experiment on the piezoelectric effect in quartz, and it would be useful for me to know its electric permittivity.
I've been told that the quartz sample that I have is ...
- 11
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
1
answer
1k
views
Electricity in clouds and induced magnetism
This is well known to everyone that clouds carry electric charges and cumulonimbus clouds contain huge amount of electricity. It is also known from Maxwell's equations that moving particles induce ...
- 635
2
votes
1
answer
578
views
Understanding pushbroom sensors
Does a push broom scanner scan a path perpendicular to the direction of satellite travel? I am confused because its detectors are arranged across track even though it scans along track.
- 123
10
votes
1
answer
138
views
Does the Earth receive a net charge from the aurorae?
The sun radiates a lot of charged particles to the Earth. When the magnetic field of the Earth lines up to the poles, we get the beautiful polar lights.
But are there as many negative charged as ...
- 2,523
7
votes
0
answers
137
views
How does fog affect the conductivity/breakdown voltage of air?
Could the breakdown voltage of air significantly go down in very foggy weather (especially very salty fog from seawater)? Kind of a hypothetical question, but if anyone has something on this, I'd ...
- 233
4
votes
1
answer
368
views
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. ...
- 141
1
vote
2
answers
112
views
What causes the earth to be a good grounding system?
When working with electricity, rubber shoes are recommended because they prevent current from running through your body.
But I've read that usually the earth is more negative charged than positive. ...
- 2,523
4
votes
1
answer
100
views
What causes aurorae?
I know that aurorae are caused by solar activity interacting with the Earth's magnetic field as charged particles are funneled down into the polar magnetic mirrors.
On one hand, I know that as ...
- 225
6
votes
1
answer
2k
views
Is there a buildup of static electricity in a sandstorm?
In a sandstorm, is there a buildup of static electricity? If so, does that produce lightning strikes? Also if you were to be inside the storm what would the build of that level of static feel like?
- 139
13
votes
3
answers
3k
views
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 ...
- 232
6
votes
1
answer
8k
views
Does earth itself emit electromagnetic waves?
(.... and if so, of what frequency and amplitude)?
This Skeptics.SE question about nonsense called 'geopathic stress' made me wonder if and how earth itself emits electromagnetic waves.
We need ...
- 2,679
13
votes
1
answer
2k
views
How do you calculate the depth of penetration in a Schlumberger array?
In a resistivity survey, how do we calculate the depth of penetration for a Schlumberger array?
- 1,487
23
votes
1
answer
2k
views
What causes 'positive' lightning to be rarer, higher charged, and longer lasting than 'negative' lightning?
Why is 'positive' lightning rarer, brighter, higher charged, and longer lasting than 'negative' lightning? Are there any other unique characteristics to positive lightning that sets it apart from ...
- 2,638