EGU22-536, updated on 26 Mar 2022
https://doi.org/10.5194/egusphere-egu22-536
EGU General Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Coordinated observations of relativistic electron enhancements following the arrival of consecutive Corotating Interaction Regions

Afroditi Nasi1, Ioannis A. Daglis1,2, Christos Katsavrias1, Ingmar Sandberg3, Wen Li4, Hayley Allison5, Yoshizumi Miyoshi6, Shun Imajo7, Takefumi Mitani8, Tomo Hori6, Yuri Shprits5, Satoshi Kasahara9, Shoichiro Yokota10, Kunihiro Keika9, Iku Shinohara8, Ayako Matsuoka7, and Yoshiya Kasahara11
Afroditi Nasi et al.
  • 1National and Kapodistrian University of Athens, Physics Department, Athens, Greece (aphrodite.nasi@gmail.com)
  • 2Hellenic Space Center, Athens, Greece
  • 3Space Applications & Research Consultancy (SPARC), Greece
  • 4Center for Space Physics, Boston University, Boston, MA, USA
  • 5GFZ German Research Centre for Geosciences, Potsdam, Germany
  • 6Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, Japan
  • 7Kyoto University, Kyoto, Japan
  • 8Japan Aerospace Exploration Agency, Japan
  • 9University of Tokyo, Tokyo, Japan
  • 10Osaka University, Osaka, Japan
  • 11Kazanawa University, Kazanawa, Japan

During July-October of 2019, a sequence of Corotating Interaction Regions (VSW ≥ 600 km/s) impacted the magnetosphere, for four consecutive solar rotations. Even though the series of CIRs resulted in relatively weak geomagnetic storms (SYM-Hmin ≈ -60 nT, Kpmax ≈ 5), the net effect of the outer radiation belt during each disturbance was different, depending on the electron energy. During the August-September CIR, intense substorm activity was recorded (SMLmin ≈ - 2000 nT), as well as significant enhancement of ultra-relativistic electrons.

We exploit coordinated and cross-calibrated particle measurements from the Van Allen Probes, Arase and Galileo 207, 215 satellites, to investigate the relative contribution of radial diffusion and gyro-resonant acceleration, using both electron fluxes and Phase Space Density (PSD) radial profiles, also compared with a 1D Fokker-Planck simulation.

Additionally, we use chorus wave amplitude and radial diffusion coefficient (DLL) estimations, from the SafeSpace DLL database, density measurements from the GFZ-Potsdam database, as well as solar wind and geomagnetic parameters, for a detailed investigation of these events.

This work has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 870437 for the SafeSpace project.

How to cite: Nasi, A., Daglis, I. A., Katsavrias, C., Sandberg, I., Li, W., Allison, H., Miyoshi, Y., Imajo, S., Mitani, T., Hori, T., Shprits, Y., Kasahara, S., Yokota, S., Keika, K., Shinohara, I., Matsuoka, A., and Kasahara, Y.: Coordinated observations of relativistic electron enhancements following the arrival of consecutive Corotating Interaction Regions, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-536, https://doi.org/10.5194/egusphere-egu22-536, 2022.

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