Geomagnetic Field Variability Analysis Based on Polar Diagrams

—The paper addresses the variability properties of the intensity and direction of the magnetic field during a substorm as well as magnetically quiet periods. The main focus is on the properties of the variations in the time derivative of the magnetic field d B / dt which are a factor of particular i...

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Bibliographic Details
Published in:Izvestiya. Physics of the solid earth 2020-11, Vol.56 (6), p.854-863
Main Authors: Khokhlov, A. V., Pilipenko, V. A., Krasnoperov, R. I., Nikolova, Yu. I., Dobrovolsky, M. N.
Format: Article
Language:English
Subjects:
Earth and Environmental Science
Earth Sciences
Earth surface
Electric currents
Fields (mathematics)
Geomagnetic field
Geomagnetic field variations
Geomagnetism
Geophysics/Geodesy
Magnetic field
Magnetic fields
Magnetic properties
Magnetism
Perturbation
Polar diagrams
Properties
Variability
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Summary:—The paper addresses the variability properties of the intensity and direction of the magnetic field during a substorm as well as magnetically quiet periods. The main focus is on the properties of the variations in the time derivative of the magnetic field d B / dt which are a factor of particular importance for the problem of the geomagnetically induced currents. A method of two- (2D) and three-dimensional (3D) diagrams is proposed for visual representation of the directional variations of a vector field. As an example, the geomagnetic field variations during the isolated substorm of October 17, 2015 are analyzed with the use of the chain of the IMAGE network magnetic stations. It is confirmed that d B / dt in the horizontal plane has a much stronger variability than the geomagnetic field perturbation Δ В . The proposed 3D diagrams show that the d B / dt polarization plane is inclined towards the Earth’s surface, which is probably due to the irregularity of the field of geomagnetic fluctuations.
ISSN:1069-3513
1555-6506
DOI:10.1134/S1069351320060038