Articles | Volume 35, issue 3
Ann. Geophys., 35, 365–376, 2017
https://doi.org/10.5194/angeo-35-365-2017
Ann. Geophys., 35, 365–376, 2017
https://doi.org/10.5194/angeo-35-365-2017

Regular paper 08 Mar 2017

Regular paper | 08 Mar 2017

Non-triggered auroral substorms and long-period (1–4 mHz) geomagnetic and auroral luminosity pulsations in the polar cap

Nadezda Yagova et al.

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Short summary
A substorm is a dramatic phenomenon in the near-Earth space that is visualized as an aurora. Mostly substorms are caused by changes in the solar wind, but some of them can develop without any evident trigger. Such substorms together with undisturbed days were investigated using magnetometer and photometer data from Svalbard. Substorm precursors, i.e., specific features in 1–4 mHz geomagnetic and auroral luminosity pulsations, have been found at high geomagnetic latitudes.