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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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  08 Jan 2021

08 Jan 2021

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

On the semi-annual variation of relativistic electrons in the outer radiation belt

Christos Katsavrias1,2, Constantinos Papadimitriou1,2, Sigiava Aminalragia-Giamini1,2, Ioannis A. Daglis1,3, Ingmar Sandberg2, and Piers Jiggens4 Christos Katsavrias et al.
  • 1Department of Physics, National and Kapodistrian University of Athens, Greece
  • 2Space Applications and Research Consultancy (SPARC), Athens, Greece
  • 3Hellenic Space Center, Athens, Greece
  • 4ESA/ESTEC, the Netherlands

Abstract. The nature of the semi-annual variation in the relativistic electron fluxes in the Earth’s outer radiation belt is investigated using Van Allen Probes (MagEIS and REPT) and GOES (EPS) data during solar cycle 24. We perform wavelet and cross-wavelet analysis in a broad energy and spatial range of electron fluxes and examine their phase relationship with the axial, equinoctial and Russell-McPherron mechanisms. It is found that the semi-annual variation in the relativistic electron fluxes exhibits pronounced power in the 0.3–4.2 MeV energy range at L-shells higher than 3.5 and, moreover, it exhibits an in-phase relationship with the Russell-McPherron effect indicating the former is primarily driven by the latter. Furthermore, the analysis of the past 3 solar cycles with GOES/EPS indicates that the semi-annual variation at geosynchronous orbit is evident during the descending phases and coincides with periods of a higher (lower) HSS (ICME) occurrence.

Christos Katsavrias et al.

Status: open (until 19 Feb 2021)

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Christos Katsavrias et al.

Christos Katsavrias et al.


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