Articles | Volume 34, issue 11
Ann. Geophys., 34, 1069–1084, 2016
Ann. Geophys., 34, 1069–1084, 2016

Regular paper 22 Nov 2016

Regular paper | 22 Nov 2016

Identification of the different magnetic field contributions during a geomagnetic storm in magnetospheric and ground observations

Tommaso Alberti et al.

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Short summary
We investigate the time variation of the magnetospheric and Earth's magnetic field during both quiet and disturbed periods. We identify the timescale variations associated with different magnetospheric current systems, solar-wind–magnetosphere high-frequency interactions, ionospheric processes, and internal dynamics of the magnetosphere. In addition, we propose a new local index for the identification of the intensity of a geomagnetic storm on the ground.