Astrophysics (Index)About

subradio

(electromagnetic radiation, frequency below 3 kHz)

The term subradio is sometimes used for electromagnetic radiation with frequencies below that of radio. In communications, such frequencies are used for only very specialized applications, and the "lower end of radio frequencies" is not universally agreed upon, and has been placed at different frequencies, e.g., 3 Hz, 3 kHz, or 30 kHz.

Bands at the lower end of radio or beyond, i.e., subradio:

very low frequency (VLF) 3-30 kHz
ultra low frequency (ULF) 300-3000 Hz
super low frequency (SLF) 30-300 Hz
extremely low frequency (ELF) 3-30 Hz
tremendously low frequency (TLF) 0-3 Hz

(EMR,spectrum,band)
Further reading:
http://en.wikipedia.org/wiki/Electromagnetic_spectrum
http://en.wikipedia.org/wiki/Extremely_low_frequency
WaveLFreqPhoton
Energy
  
100km3kHz12peVbeginsubradio
inf0Hz0eVendsubradio

Referenced by pages:
electromagnetic spectrum
extremely low frequency (ELF)
radio
super low frequency (SLF)
tremendously low frequency (TLF)
ultra low frequency (ULF)
very low frequency (VLF)

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