Time sequence of quasiperiodic geomagnetic disturbances during substorms

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Abstract

Based on the data from the 2D IMAGE network and magnetic stations located in Russia, a study was conducted of a sequence of quasi-periodic geomagnetic variations with an amplitude of up to 600 nT and a duration of ~20 min that arose in the post-midnight sector during a minor global magnetic storm. It was shown that geomagnetic variations arose against the background of substorms at the same corrected geomagnetic latitude Φ′ ~65° sequentially one after another and moved by ~20° in longitude to the east, with a new variation occurring when the previous one moved by ~10°. It was shown that the ionospheric source of these variations is a pair of Hall current eddies, each of which has an elliptical shape with a major axis in the north-south direction. The estimated size of the ionospheric source is ~940 km in the west-east direction (each Hall current vortex is ~470 km) and ~1000 km in the north-south direction. The centers of the ionospheric sources of these variations moved eastward at a speed of ~0.8 km/s. It is shown that each geomagnetic variation is accompanied by a burst of Pi1–2 geomagnetic pulsations. It is suggested that the observed geomagnetic variations are created by magnetic fields of ionospheric current systems of microsubstorms.

About the authors

V. S. Ismagilov

Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation RAS, St. Petersburg Branch, Russian Academy of Sciences

Email: ivs@izmiran.spb.ru
St. Petersburg, Russia

Y. A. Kopytenko

Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation RAS, St. Petersburg Branch, Russian Academy of Sciences

Author for correspondence.
Email: ivs@izmiran.spb.ru
St. Petersburg, Russia

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In the print version, the article was published under the DOI: 10.31857/S0016794025040042


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