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Natural VLF Radio - Sounds of Space Weather
*
2018 recording by NASA RBSP (Radiation Belt Storm Probe)
{{DEFAULTSORT:Dawn Chorus (Electromagnetic) Electrical phenomena Geomagnetism
The electromagnetic
In physics, electromagnetism is an interaction that occurs between particles with electric charge. It is the second-strongest of the four fundamental interactions, after the strong force, and it is the dominant force in the interactions o ...
dawn chorus is a phenomenon that occurs most often at or shortly after dawn
Dawn is the time that marks the beginning of twilight before sunrise. It is recognized by the appearance of indirect sunlight being scattered in Earth's atmosphere, when the centre of the Sun's disc has reached 18° below the observer's hori ...
local time. With the proper radio
Radio is the technology of signaling and communicating using radio waves. Radio waves are electromagnetic waves of frequency between 30 hertz (Hz) and 300 gigahertz (GHz). They are generated by an electronic device called a transmi ...
equipment, dawn chorus can be converted to sounds that resemble birds' dawn chorus (by coincidence).
The electromagnetic dawn chorus is believed to be generated by a Doppler-shifted cyclotron interaction between anisotropic distributions of energetic (> 40 keV) electrons and ambient background VLF noise. These energetic electrons are generally injected into the inner magnetosphere at the onset of the substorm expansion phase.
Dawn choruses occur more frequently during magnetic storms.
This phenomenon also occurs during aurorae, when it is termed an auroral chorus.
See also
* Auroral chorus *Hiss (electromagnetic)
Electromagnetic hiss is a naturally occurring Extremely Low Frequency/Very Low Frequency electromagnetic wave (i.e., 300 Hz – 10 kHz) that is generated in the plasma of either the Earth's ionosphere or magnetosphere. Its name is de ...
*Whistler (radio)
A whistler is a very low frequency (VLF) electromagnetic (radio) wave generated by lightning. Originally published by Stanford University Press, Stanford, California (1965). Frequencies of terrestrial whistlers are 1 kHz to 30 kHz, wi ...
* Cluster One, a Pink Floyd track using sferics
A radio atmospheric signal or sferic (sometimes also spelled "spheric") is a broadband electromagnetic impulse that occurs as a result of natural atmospheric lightning discharges. Sferics may propagate from their lightning source without major a ...
and dawn chorus as an overture
Notes
Further reading
* *External links
*Natural VLF Radio - Sounds of Space Weather
*
2018 recording by NASA RBSP (Radiation Belt Storm Probe)
{{DEFAULTSORT:Dawn Chorus (Electromagnetic) Electrical phenomena Geomagnetism