SPECTRAL DISTRIBUTION OF GEOMAGNETIC NOISE IN A RANGE OF LOW FREQUENCIES
The spectral distribution of low-frequency geomagnetic noise measured in the signal accumulation mode by means of a magnetomodulation magnetic induction sensor in a quiet geomagnetic field is considered. A comparison of measurements of geomagnetic noise by sensors of various types is given. It is shown that to obtain a representative low-frequency geomagnetic noise distribution spectrum, it is necessary to increase the signal accumulation time to at least 100 periods of the lower frequency of the measured magnetic field.