Multi‐Platform Observations of the Radial Penetration of Substorm Injected Electrons and Subsequent Slot‐Filling Event

This research was supported by the International Space Science Institute (ISSI) in Bern through ISSI International Team project #477 (Radiation Belt Physics From Top To Bottom: Combining Multipoint Satellite Observations And Data Assimilative Models To Determine The Interplay Between Sources And Losses) with J.-F Ripoll and G.D. Reeves, co-leaders. This work was also supported by the joint research program of the Institute for Space-Earth Environmental Research, Nagoya University. The authors thank the EFW and EMFISIS teams of the Van Allen Probes mission for their support. We would also like to thank Prof. Y. Ogawa for operations and data from the Tromso all sky cameras, Dr. M. Henderson for processing the LANL-GEO Data, and E. Spanswick for the operation of and data from the GO-RIO stations. The work of J-FR and GC was performed under the auspices of an agreement between CEA/DAM (Commissariat a l'Energie Atomique, Direction des Applications Militaires) and NNSA/DP (National Nuclear Security Administration, Defense Program) on cooperation on fundamental science. J-FR thanks the Direction Generale de l'Armement (DGA) and the Agence pour l'Innovation de Defense (AID) for funding the ASTRID project "PACTE- ESPACE." CMC acknowledges the support of the Natural Sciences and Engineering Research Council of Canada (NSERC), funding reference number RGPIN-2020-05219. VP thanks the project 21GRD02 BIOSPHERE that has received funding from the European Partnership on Metrology, co-financed by the European Union's Horizon Europe Research and Innovation Programme. Processing and analysis of the Van Allen Probes data was supported by the Energetic Particle, Composition, and Thermal Plasma (RBSP-ECT), the Electric and Magnetic Field Instrument Suite and Integrated Science (EMFISIS), and the Electric Fields and Waves (EFW) investigations were funded under NASA's Prime contract no. NAS5-01072.