Speaker
Description
Motivated by the need for improved radiation environment modeling, this study investigates the drivers behind sub-relativistic electron flux variations in the inner magnetosphere. We utilize electron flux measurements between 1 to 500 keV from the Hope and MagEIS instruments on board the RBSP satellites and the FEEPS instruments on board the MMS spacecraft. along with solar wind parameters and geomagnetic indices obtained from the OmniWeb2 and SuperMag data services. We calculate the correlation coefficients between these parameters and electron flux, and we also use mutual information analysis to reveal non-linear relationships within the data. Our results confirm that substorm activity is a crucial driver of the source electron population (10–100 keV), however, for seed electrons (100–400 keV), we find they are influenced not only by substorm events, but also from enhanced convection/inward diffusion. By introducing time lags, we capture a delayed response of electron flux to changes in geospace conditions, and we identify specific time lag periods where the correlation coefficients and mutual information values are maximum. This analysis also reveals the primary driver of the seed electrons, as well as the characteristic time delays of inward and outward diffusion. Overall, this work contributes to our broader understanding of the sub-relativistic electron dynamics in the outer belt and forms the basis for future research.
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