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・ Dawn chorus (birds)
Dawn chorus (electromagnetic)
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Dawn chorus (electromagnetic) : ウィキペディア英語版
Dawn chorus (electromagnetic)

The electromagnetic dawn chorus is a phenomenon that occurs most often at or shortly after dawn local time. With the proper radio 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)
*Whistler (radio)
*Cluster One, a Pink Floyd track using sferics and dawn chorus as an overture

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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