Articles | Volume 38, issue 4
Ann. Geophys., 38, 901–918, 2020
Ann. Geophys., 38, 901–918, 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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Cited articles

Agapitov, O., Glassmeier, K.-H., Plaschke, F., Auster, H.-U., Constantinescu, D., Angelopoulos, V., Magnes, W., Nakamura, R., Carlson, Ch. W., Frey, S., and McFadden J. P.: Surface waves and field line resonances: A THEMIS case study, J. Geophys. Res., 114, A00C27,, 2009. 
Aikio, A. T., Lakkala, T., Kozlovsky, A., and Williams, P. J. S.: Current systems of stable drifting auroral arcs in the evening sector, J. Geophys. Res., 107, 1424,, 2002. 
Akasofu, S.-I.: Physics of Magnetospheric Substorms, Astrophysics and Space Science Library, Vol. 47, edited by: Reidel, D., Hingham, Mass., 619 pp., 1977. 
Akasofu, S.-I. and Kimball, D. S.: The dynamics of the aurora – I: Instability of aurora, J. Atmos. Terr. Phys., 26, 205–206,, 1964. 
Amm, O. and Viljanen, A.: Ionospheric disturbance magnetic field continuation from the ground to the ionosphere using spherical elementary current systems, Earth Planet. Space, 51, 431–440,, 1999. 
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.