super low frequency
(SLF)
(electromagnetic radiation, frequency 30 Hz to 300 Hz)
Super low frequency (SLF) radiation is defined by the ITU
to be electromagnetic radiation within the frequency range of 30 to 300 Hz.
It is considered within the lower-frequency end of the
radio spectrum or part of subradio, i.e., beyond radio.
It falls between extremely low frequency (ELF) and ultra low frequency (ULF).
Of note is that 50 Hz and 60 Hz, typical frequencies of AC power,
fall within this range, thus power lines produce much of the SLF
radiation around us. SLF wavelengths of are very long (1000
km and longer) which reduces the SLF produced by power lines and
also generally eliminates antenna-designs that match the antenna's
physical length to the wavelength.
(EMR,spectrum,band,radio,subradio)
Further reading:
https://en.wikipedia.org/wiki/Super_low_frequency
https://en.wikipedia.org/wiki/Radio_spectrum#ITU
https://www.itu.int/dms_pubrec/itu-r/rec/v/R-REC-V.431-7-200005-S!!PDF-E.pdf
WaveL | Freq | Photon Energy | | |
999km | 300Hz | 1.3peV | begin | super low frequency |
9993km | 30Hz | 124×10-15eV | end | super low frequency |
|
Referenced by pages:
extremely low frequency (ELF)
subradio
ultra low frequency (ULF)
Index