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AuthorsTozzi, R.* 
Mandea, m.* 
De Michelis, p.* 
TitleUnmodelled magnetic contributions in satellite-based models
Issue Date28-Jun-2016
Series/Report no.1/68 (2016)
KeywordsSwarm magnetic vector data
Interplanetary Magnetic Field
Magnetic models
Field-aligned currents
Partial ring current
Subject Classification01. Atmosphere::01.03. Magnetosphere::01.03.99. General or miscellaneous 
01. Atmosphere::01.03. Magnetosphere::01.03.02. Magnetic storms 
04. Solid Earth::04.05. Geomagnetism::04.05.03. Global and regional models 
05. General::05.07. Space and Planetary sciences::05.07.01. Solar-terrestrial interaction 
AbstractA complex system of electric currents flowing in the ionosphere and magnetosphere originates from the interaction of the solar wind and the Interplanetary Magnetic Field (IMF) with the Earth’s magnetic field. These electric currents generate magnetic fields contributing themselves to those measured by both ground observatories and satellites. Here, low-resolution (1 Hz) magnetic vector data recorded between 1 March 2014 and 31 May 2015 by the recently launched Swarm constellation are considered. The core and crustal magnetic fields and part of that originating in the magnetosphere are removed from Swarm measurements using CHAOS-5 model. Low- and mid-latitude residuals of the geomagnetic field representing the ionospheric and the unmodelled magnetospheric contributions are investigated, in the Solar Magnetic frame, according to the polarity of IMF B y (azimuthal) and B z (north–south) components and to different geomagnetic activity levels. The proposed approach makes it possible to investigate the features of unmodelled contributions due to the external sources of the geomagnetic field. Results show, on one side, the existence of a relation between the analysed residuals and IMF components B y and B z , possibly due to the long distance effect of high-latitude field-aligned currents. On the other side, they suggest the presence of a contribution due to the partial ring current that is activated during the main phase of geomagnetic storms. The perturbation observed on residuals is also compatible with the effect of the net field-aligned currents. Moreover, we have quantitatively estimated the effect of these current systems on computed residuals.
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