[P-EM12] Dynamics of the Inner Magnetospheric System

[PEM12-21] Statistical Comparisons of Spin-Averaged Electron Flux from ARASE and Van Allen Probes Instruments

*Matyas Szabo-Roberts^1,2、Yuri Shprits^1,2、Hayley J Allison¹、Artem Smirnov^1,2、Nikita Aseev⁷、Ruggero Vasile¹、Yoshizumi Miyoshi⁴、Takefumi Mitani^4,5,6、Nana Higashio⁵、Satoshi Kasahara³ (1.Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences、2.University of Potsdam、3.Department of Earth and Planetary Science, School of Science, The University of Tokyo、4.Nagoya University、5.JAXA Japan Aerospace Exploration Agency、6.ISAS Institute of Space and Aeronautical Science、7.Huawei Technologies)

Following the end of the Van Allen Probes mission, the ARASE satellite offers a unique opportunity to continue in-situ radiation belt particle measurements into the next solar cycle. In this study we compare spin-averaged flux measurements from the MEPe, HEP-L, HEP-H, and XEP-SSD instruments on ARASE with those from the MagEIS and REPT instruments on the Van Allen Probes, calculating Pearson R and the mean ratio of fluxes at L* conjunctions between the spacecraft. ARASE and Van Allen Probes measurements show a close agreement over a wide range of energies, observing a similar general evolution of electron flux, as well as average, peak, and minimum values. Measurements from the two missions agree especially well in the 3.5<L*<4.5 range where ARASE is at similar magnetic latitudes as the Van Allen Probes. ARASE tends to record higher flux <670 keV with longer decay times after flux enhancements, particularly for L*<3.5 . Conversely, for energies >1.4 MeV, ARASE flux measurements are generally lower than those of Van Allen Probes, especially for L*>4.5 . The Person R values show that the >1.4 MeV flux from both missions are well correlated and thus, although flux magnitudes differ, all spacecraft observe a similar general evolution. However, the correlation decreases as L* increases due to ARASE measuring at magnetic latitudes outside Van Allen Probes orbits for L*>4.5. We perform a preliminary intercalibration between the two missions using the mean ratio of the fluxes as an energy- and L*- dependent correction factor. The correction factor significantly improves agreement between the fluxes above 1.4 MeV.