Astrophysics (index)

Subradio

(electromagnetic radiation, frequency below 3kHz)

The term Subradio is sometimes used for Electromagnetic Radiation (EMR) 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., 3Hz, 3kHz, or 30kHz.

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

Very Low Frequency (VLF) 3kHz-30kHz
Ultra Low Frequency (ULF) 300Hz-3kHz
Super Low Frequency (SLF) 30Hz-300Hz
Extremely Low Frequency (ELF) 3Hz-30Hz
Tremendously Low Frequency (TLF) 0Hz-3Hz

(EMR,spectrum,band)
http://en.wikipedia.org/wiki/Electromagnetic_spectrum
WaveLFreqPhoton
Energy
  
100km3kHz12peVbeginSubradio
inf0Hz0eVendSubradio

Referenced by:
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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