EGU21-11390, updated on 04 Mar 2021
https://doi.org/10.5194/egusphere-egu21-11390
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Quantifying the dependence of electron fluxes in the Earth’s radiation belts with radial diffusion drivers through the use of information theory.

Adnane Osmane1, Mikko Savola1, Emilia Kilpua1, Hannu Koskinen1, Joe Borovsky2, and Milla Kalliokoski1
Adnane Osmane et al.
  • 1University of Helsinki
  • 2Space Science Institute

We describe the use of information-theoretic methodologies to characterise statistical dependencies of energetic electron fluxes (130 keV and >1 MeV) with a wide range of solar wind and magnetospheric drivers. We focus specifically on drivers associated with radial diffusion processes and revisit the events studied by Rostoker et al. Geophys. Res. Lett. (1998) in terms of mutual information. The main benefit of mutual information, in comparison to the Pearson correlation and other linear measures, lies in the capacity to distinguish nonlinear statistical dependencies from linear ones.  We find that observed enhancement in relativistic electron fluxes correlate weakly, both linearly and nonlinearly, with the ULF power spectrum, whereas less energetic electron fluxes show stronger statistical dependency with both ground and in situ ULF wave power. Our results are indicative of the need to incorporate data analysis tools that can distinguish between interdependencies of various solar wind drivers.

How to cite: Osmane, A., Savola, M., Kilpua, E., Koskinen, H., Borovsky, J., and Kalliokoski, M.: Quantifying the dependence of electron fluxes in the Earth’s radiation belts with radial diffusion drivers through the use of information theory., EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-11390, https://doi.org/10.5194/egusphere-egu21-11390, 2021.

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