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Principal component analysis to separate different ionospheric and magnetospheric contributions to the geomagnetic field variations

Rania Rebbah - University of Coimbra,CITEUC, Department of Physics, Portugal; Anna Morrozova - University of Coimbra, CITEUC, Portugal

Session: Earth's Magnetosphere and Radiation Belts


Day to day variability in the geomagnetic field (GMF) variations recorded on the ground results from several current systems in the ionosphere and the magnetosphere. These variations are classified either as diurnal or occurring during periods of disturbances. The most notable, among the regular variations during the geomagnetically quiet days are the so-called solar quiet daily variation (Sq) and the disturbance daily variation SD. These variations have well recognised daily cycles and need to be detected before the analysis of the disturbing field.

The data on variations of the geomagnetic field components X, Y and Z measured at the Coimbra Geomagnetic Observatory (COI) in Portugal between 2007-2017 were analysed. Each month was analysed separately to take into consideration the seasonal effect. We used principal component analysis (PCA) to extract different modes of GMF variations. The SD and Sq variations were identified as the two PCA modes (PC1 and PC2). The PCA mode identified as Sq is compared to the Sq calculated by the standard methods using five international quietest days per month. 

Approaching deadlines:

Registration opens:

16 July 2020

Abstract submission opens:

16 July 2020

European Space Weather Medals:

6 September 2020

Registration deadline:

25 September 2020

Registration deadline: [extended]

10 October 2020

Abstract submission deadline:

4 September 2020