ultra low frequency
(ULF)
(electromagnetic radiation, frequency 300 Hz to 3 kHz)
Ultra low frequency (ULF) radiation is defined by the ITU
to be electromagnetic radiation (EMR) within the frequency range of 300 Hz to 3 kHz.
It is considered within the lower-frequency end of the
radio spectrum, or beyond (i.e., subradio).
It falls between super low frequency (SLF) and very low frequency (VLF).
Note that in the sciences, the term ultra low frequency (ULF)
is often used for extremely low frequencies without regard to the
ITU specification, e.g., meaning frequencies less than a kHz or
even meaning on the order of a Hz.
The term may be used for EMR, sound waves, or seismic waves.
Example areas where such waves are of interest are geophysics and
space weather.
(EMR,spectrum,band,radio,subradio)
Further reading:
https://en.wikipedia.org/wiki/Ultra_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
https://ui.adsabs.harvard.edu/abs/2022ITAP...70.3710T/abstract
https://arxiv.org/abs/1810.03948
https://ui.adsabs.harvard.edu/abs/2021JGRA..12629283K/abstract
https://ui.adsabs.harvard.edu/abs/2009NHESS...9.1953E/abstract
WaveL | Freq | Photon Energy | | |
100km | 3kHz | 12peV | begin | ultra low frequency |
999km | 300Hz | 1.3peV | end | ultra low frequency |
|
Referenced by pages:
subradio
super low frequency (SLF)
very low frequency (VLF)
Index