ultra low frequency
(electromagnetic radiation, frequency 300Hz to 3kHz)
Ultra low frequency (ULF) radiation is electromagnetic radiation
defined by the ITU to be within the frequency range of
300Hz to 3kHz.
It is considered within the lower-frequency end of the
radio spectrum, or beyond (subradio).
It is adjacent to super low frequency and very low frequency.
| || |
|100km||3kHz||12peV||begin||ultra low frequency|
|999km||300Hz||1.3peV||end||ultra low frequency|
super low frequency (SLF)
very low frequency (VLF)