Preprints
https://doi.org/10.5194/angeo-2021-56
https://doi.org/10.5194/angeo-2021-56

  08 Oct 2021

08 Oct 2021

Review status: this preprint is currently under review for the journal ANGEO.

The "SafeSpace" Radial Diffusion Coefficients Database: Dependencies and application to simulations

Christos Katsavrias1, Afroditi Nasi1, Ioannis A. Daglis1,2, Sigiava Aminalragia-Giamini1,3, Nourallah Dahmen4, Constantinos Papadimitriou1,3, Marina Georgiou1, Antoine Brunet4, and Sebastien Bourdarie4 Christos Katsavrias et al.
  • 1Department of Physics, National and Kapodistrian University of Athens, Greece
  • 2Hellenic Space Center, Athens, Greece
  • 3Space Applications and Research Consultancy (SPARC), Athens, Greece
  • 4ONERA/Department of Space Environment, Toulouse, France

Abstract. Radial diffusion has been established as one of the most important mechanisms contributing to both the acceleration and loss of relativistic electrons in the outer radiation belt. In the framework of the SafeSpace project we have used 9 years (2011–2019) of multi-point magnetic and electric field measurements from THEMIS A, D and E satellites to create a database of accurately calculated radial diffusion coefficients (DLL) spanning an L* range from 3 to 8. In this work we investigate the dependence of the DLL on the various solar wind parameters, geomagnetic indices and coupling functions, and moreover, on the spatial parameters L* and Magnetic Local Time (MLT), during the solar cycle 24. The spatial distribution of the DLL reveals important MLT dependence rising from the various Ultra Low Frequency (ULF) wave generation mechanisms. Furthermore, we investigate via a superposed analysis, the dependence of the DLL on solar wind drivers. We show that the Interplanetary Coronal Mass Ejections (ICME) driven disturbances accompanied by high solar wind pressure values combined with intense magnetospheric compression produce DLLB  values comparable or even greater than the ones of DLLE. This feature cannot be captured by semi-empirical models and introduces a significant energy dependence on the DLL. Finally, we show the advantages of the use of accurately calculated DLL by means of numerical simulations of relativistic electron fluxes performed with the Salammbô code and significant deviations of several semi-empirical model predictions depending on the level of geomagnetic activity and L-shell.

Christos Katsavrias et al.

Status: open (until 27 Nov 2021)

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Christos Katsavrias et al.

Data sets

SafeSpace Radial Diffusion Coefficients Database Christos Katsavrias https://synergasia.uoa.gr/modules/document/?course=PHYS120

Christos Katsavrias et al.

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Short summary
Radial diffusion mechanism is of outmost importance to both the acceleration and loss of relativistic electrons in the outer radiation belt and, consequently, for physics-based models, which provide nowcasting/forecasting of the electron population. In the framework of the SafeSpace project we have created a database of accurately calculated radial diffusion coefficients and, furthermore, we have exploited it to provide insights for future modelling efforts.