Schumann Resonance (4th mode)
27.30 Hz
The fourth mode of the cavity between the ground and the ionosphere.
How well is this supported?
MeasuredPhysical measurement
Measured directly, or defined by a published standard.
This value is measured, or set by a published standard.
What the four labels meanChecked against sources September 27, 2026
About this number
The fourth mode of the cavity between the ground and the ionosphere. Published values range from 26.3 to 27.3 Hz, and the value varies through the day. The modes are not whole-number multiples of the first, so they are modes, not harmonics.
Facts
- Frequency
- 27.30 Hz
- Wavelength (electromagnetic wave)
- 10,981 km
- Kind of statement
- Physical measurement
- Filed under
- Earth, Moon & Sun
Sources
- Schumann resonance
The prediction, the first measurement, and a later summary of the mode frequencies.
W. O. Schumann, Zeitschrift für Naturforschung A 7 (1952) 149–154. M. Balser and C. A. Wagner, Nature 188 (1960) 638–641. F. Simões, R. Pfaff and H. Freudenreich, NASA Goddard Space Flight Center (NTRS 20120000051).
View source: Schumann resonance