Questions tagged [electromagnetism]

The theory of the electric and magnetic fields, both in the static and dynamic case, in relation of the Earth.

12 questions with no upvoted or accepted answers
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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 ...
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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 ...
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Range of frequencies of the Schumann resonance?

As the surface-ionospheric gap acts as a resonator for electromagnetic waves, it should have several harmonic values from the base 7.83 Hz Schumann resonance. What is the maximum frequency for this ...
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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 ...
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44 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 ...
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45 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 ...
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37 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 ...
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21 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 ...
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0answers
16 views

What is the relationship between upper atmosphere phenomena and Schumann resonance?

As this Wikipedia article states in this description “... More recently, discrete Schumann resonance excitations have been linked to transient luminous events—sprites, ELVES, jets, and other upper-...
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42 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?
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1answer
102 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 Q1: How could you measure the ...
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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:...