Articles | Volume 38, issue 2
https://doi.org/10.5194/angeo-38-467-2020
https://doi.org/10.5194/angeo-38-467-2020
Regular paper
 | 
07 Apr 2020
Regular paper |  | 07 Apr 2020

The increase in the curvature radius of geomagnetic field lines preceding a classical dipolarization

Osuke Saka

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Latest update: 13 Dec 2024
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Short summary
The first 10 min interval of Pi2 onset is the most active period of substorms composed of field line deformations associated with an increase in curvature radius of flux tubes and their longitudinal expansion. The flux tube deformations were triggered by the ballooning instability of slow magnetoacoustic waves upon arrival of the dipolarization front from the tail. They preceded the classical dipolarization caused by the reduction of cross-tail currents and resulting pileup of the field lines.