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10 votes
Accepted

Does a geomagnetic storm visibly deflect a compass?

You can definitely see a large geomagnetic storm with a compass, if you have the timing to catch one and the patience to sit and stare for a few minutes. If you look at these minutely measurements ...
WJB's user avatar
  • 976
5 votes

What causes the earth to be a good grounding system?

The electricity you're talking about is the man-made kind, which is completely independent of any charge the Earth has relative to its atmosphere. Man-made power sources are almost all referenced to ...
Daniel Griscom's user avatar
5 votes
Accepted

Why is there a window in the absorption spectrum of Earth's atmosphere at a wavelength of 4 μm?

There is simply no strong enough absorption of any of the greenhouse gases at this wavelength. However this does not mean that there is none. Remember that what you are seeing here is the transmission ...
AtmosphericPrisonEscape's user avatar
5 votes
Accepted

Electricity in clouds and induced magnetism

The short answer to your question is yes all charge particles (positive or negative), independent (like electron, proton) or attached to other materials like cloud droplets, molecules, atoms, etc. ...
Harish's user avatar
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4 votes
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Did Dark Lightning turn out to be a real thing? Is this what produces gamma ray flashes from lightning storms?

According to the American Geophysical Union and reported at phys.org: Dark lightning is a burst of gamma-rays produced during thunderstorms by extremely fast moving electrons colliding with air ...
GrapefruitIsAwesome's user avatar
3 votes
Accepted

Understanding pushbroom sensors

Does the image of the pushbroom scans a path perpendicular to the direction of satellite travel? Not really. There is no "scanning" in a push broom sensor. A push broom sensor does not have any ...
David Hammen's user avatar
  • 23.7k
3 votes

Does the Earth receive a net charge from the aurorae?

No. If that were the case, the Sun would eventually develop a net charge. Let's imagine that's the case and the Sun develops a net positive charge. That charge would eventually stop negative ...
Camilo Rada's user avatar
  • 17.7k
3 votes
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Why do electrons drift Eastwards in the Van Allen belts?

You are looking at $\nabla \vec B$-drift here (spoken: grad-E drift). This type of motion can be explained in a simplified way, when imagining a 2-D plane, separated at y=0 with two different magnetic ...
AtmosphericPrisonEscape's user avatar
2 votes

Databases of all Astronomical Geomagnetic storms data

Could you be specific in your question as to what data you need on storms? Do you just need dates when storms occurred, or global geomagnetic index activity levels, or ground magnetic field ...
WJB's user avatar
  • 976
2 votes

What is the meaning of integral of negative magnetic field (nT) over time?

Disturbance storm time index is a measure of the weakened horizontal component of Earth magnetic field during great magnetic disturbances. The depression is often flanked by peaks, that initiates and ...
user2821's user avatar
  • 5,946
2 votes

Transmitter receiver coil separation for Electromagnetic Terrain Conductivity Measurement

As described in the question there are two similar coils, one radiates the AC magnetic field ("transmitter") and the other picks up the weak radiated AC magnetic field produced by subsurface ...
uhoh's user avatar
  • 7,122
2 votes

If the earth's surface is negatively charged, why aren't objects close to the surface polarized?

Think of the electric current as a fluid, and a battery or some other source of current as a pump. Change the earth for the ocean. I don't know about the negatively charged earth's surface, but those -...
rasmodius's user avatar
  • 131
1 vote

How to measure voltage differential across different altitudes

How could you measure the voltage between those to points? I imagine you could measure the potential difference using weather balloons. Send one balloon up to 10,000 ft (Balloon A) and one to 20,000 ...
Reifier's user avatar
  • 36

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