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==Schumann Resonances== | ==Schumann Resonances== | ||
The [[Schumann Resonances]] (SR) are a set of spectrum peaks in the extremely low frequency ([[ELF]]) portion of the Earth's electromagnetic field spectrum. Schumann resonances are global electromagnetic resonances, excited by lightning discharges in the cavity formed by the Earth's surface and the [[Ionosphere]].<ref>http://en.wikipedia.org/wiki/Schumann_resonances]</ref> | |||
The | ==Electromagnetic Feedback Loop== | ||
The behavior of the electromagnetic field can be resolved into four different parts of a loop: | |||
* the electric and magnetic fields are generated by electric charges, | |||
* the electric and magnetic fields interact with each other, | |||
* the electric and magnetic fields produce forces on electric charges, | |||
* the electric charges move in space. | |||
A common misunderstanding is that (a) the quanta of the fields act in the same manner as (b) the charged particles that generate the fields. The feedback loop can be summarized in a list, including phenomena belonging to each part of the loop: | |||
* charged particles generate electric and magnetic fields | |||
* the fields interact with each other | |||
* changing electric field acts like a current, generating 'vortex' of magnetic field | |||
* Faraday induction: changing magnetic field induces (negative) vortex of electric field | |||
* Lenz's law: negative feedback loop between electric and magnetic fields | |||
* fields act upon particles | |||
* Lorentz force: force due to electromagnetic field | |||
* '''electric force: same direction as electric field''' | |||
* '''magnetic force: perpendicular both to magnetic field and to velocity of charge''' | |||
* particles move | |||
* current is movement of particles | |||
* particles generate more electric and magnetic fields; cycle repeats<ref>[http://en.wikipedia.org/wiki/Electromagnetic_field]</ref> | |||
==References== | |||
<references/> | |||
== | ==See Also== | ||
[[Magnetic Peak]] | |||