Abstract
On 25 August 2018, a G3-class geomagnetic storm reached the Earth’s magnetosphere, causing a transient rearrangement of the charged particle environment around the planet, which was detected by the High-Energy Particle Detector (HEPD) on board the China Seismo-Electromagnetic Satellite (CSES-01). We found that the count rates of electrons in the MeV range were characterized by a depletion during the storm’s main phase and a clear enhancement during the recovery caused by large substorm activity, with the key role played by auroral processes mapped into the outer belt. A post-storm rate increase was localized at L-shells immediately above ∼3 and mostly driven by non-adiabatic local acceleration caused by possible resonant interaction with low-frequency magnetospheric waves.
Highlights
Magnetic storms represent major signatures of variability in the Sun-Earth interaction
The Sub-MeV fluxes used in this study were from the Medium Energy Proton and Electron Detector (MEPED)-90◦ electron telescope in the E2 channel, which represents the best compromise in terms of detection efficiency over the available energy range [34] vs. proton contamination [35]
All these contributions are calculated taking into account the solar wind (SW) dynamic pressure, the interplanetary magnetic field (IMF) configuration, and the Dst index
Summary
Magnetic storms represent major signatures of variability in the Sun-Earth interaction Such events appear as magnetic disturbances caused by bursts of radiation and charged particles emitted from the Sun in the form of coronal mass ejections (CMEs), solar flares, co-rotating interaction regions (CIRs), etc. The magnetospheric disturbance was strong enough to trigger a response in the HEPD instrument; this is presented on the basis of HEPD trigger rate variations observed in the MeV energy range as a function of time and the McIlwain L-shell parameter (Section 4) Observations of this storm in a lower energy interval—from other particle detectors on board CSES-01—were previously presented in [18].
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