Measurements of Geomagnetic Field Variations in the Low Frequency Range

• Main Author: Тягунов Д.С.
• Format: Article
• Language: Russian
• Published: Institute of Volcanology and Seismology FEB RAS 2019-10-01
• Series: Вестник Камчатской региональной ассоциации "Учебно-научный центр". Серия: Науки о Земле
• Subjects: the geomagnetic noise; magnetic induction; magnetic field
• Online Access: http://www.kscnet.ru/journal/kraesc/article/view/260

The article presents the results of measurements of geomagnetic field variations obtained using magnetometers with different frequency range (0.01–200 Hz and 0.01–30 Hz) developed at the Institute of Geophysics of Uro RAS. The measurements showed that the sensitivity and resolution of the equipment used in the work is sufficient to study the variations of the geomagnetic field at low frequencies. It is shown that magnetometers used by magnetic modulation converter with auto-parametric amplification of the signal are capable of recording variations of the geomagnetic field that do not exceed the level of geomagnetic noise of 0.2 pT at a frequency of 2 Hz and 1 pT at lower frequencies. The average amplitude of the variations in the geomagnetic field of the magnetic induction components recorded by the device with a frequency range of 0.01–200 Hz in the entire bandwidth is twofold higher than the average amplitude of the magnetic induction components recorded by the device with a frequency range of 0.01–30 Hz, but the spectral composition shows close values.