very low frequency
(electromagnetic radiation, frequency 3kHz to 30kHz)
Very low frequency (VLF) radiation is electromagnetic radiation
defined by the ITU to be within the frequency range of
3kHz to 30kHz.
It is considered within the lower-frequency end of the
radio spectrum, or beyond (subradio).
It is adjacent to ultra low frequency.
| || |
|10km||30kHz||124peV||begin||very low frequency|
|100km||3kHz||12peV||end||very low frequency|
ultra low frequency (ULF)