Articles | Volume 38, issue 4
Ann. Geophys., 38, 901–918, 2020
https://doi.org/10.5194/angeo-38-901-2020
Ann. Geophys., 38, 901–918, 2020
https://doi.org/10.5194/angeo-38-901-2020

Regular paper 28 Jul 2020

Regular paper | 28 Jul 2020

Polar substorm on 7 December 2015: preonset phenomena and features of auroral breakup

Vladimir V. Safargaleev et al.

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Short summary
Comprehensive analysis of a moderate substorm was performed using optical observations inside the auroral oval and in the polar cap, combined with data from satellites, radars, and ground magnetometers. The onset took place near the poleward boundary of the auroral oval that is not typical for classical substorms. The data fit to the near-tail current disruption scenario of the substorm onset. The role of the 15 min oscillations in the IMF Bz component in the substorm initiation is discussed.