Preliminary Statistical Comparisons of Spin‐Averaged Electron Data From Arase and Van Allen Probes Instruments
Shprits, Yuri Y.
Allison, Hayley J.
Vasile, Ruggero
Smirnov, Artem G.
Aseev, Nikita A.
Drozdov, Alexander Y.
Miyoshi, Yoshizumi
Claudepierre, Seth G.
Kasahara, Satoshi
Yokota, Shoichiro
Mitani, Takefumi
Takashima, Takeshi
Higashio, Nana
Hori, Tomo
Keika, Kunihiro
Imajo, Shun
Shinohara, Iku
DOI: https://doi.org/10.1029/2020JA028929
Persistent URL: http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/9560
Allison, Hayley J.; 1 GFZ German Research Centre for Geosciences Helmholtz Centre Potsdam Potsdam Germany
Vasile, Ruggero; 1 GFZ German Research Centre for Geosciences Helmholtz Centre Potsdam Potsdam Germany
Smirnov, Artem G.; 1 GFZ German Research Centre for Geosciences Helmholtz Centre Potsdam Potsdam Germany
Aseev, Nikita A.; 1 GFZ German Research Centre for Geosciences Helmholtz Centre Potsdam Potsdam Germany
Drozdov, Alexander Y.; 2 Institute of Physics and Astronomy University of Potsdam Potsdam Germany
Miyoshi, Yoshizumi; 4 ISEE Nagoya University Nagoya Japan
Claudepierre, Seth G.; 3 Department of the Earth, Planetary and Space Sciences University of California Los Angeles CA USA
Kasahara, Satoshi; 6 School of Science University of Tokyo Tokyo Japan
Yokota, Shoichiro; 7 Osaka University Toyonaka Japan
Mitani, Takefumi; 8 Japanese Aerospace Exploration Agency Tokyo Japan
Takashima, Takeshi; 8 Japanese Aerospace Exploration Agency Tokyo Japan
Higashio, Nana; 8 Japanese Aerospace Exploration Agency Tokyo Japan
Hori, Tomo; 4 ISEE Nagoya University Nagoya Japan
Keika, Kunihiro; 6 School of Science University of Tokyo Tokyo Japan
Imajo, Shun; 4 ISEE Nagoya University Nagoya Japan
Shinohara, Iku; 8 Japanese Aerospace Exploration Agency Tokyo Japan
Abstract
Following the end of the Van Allen Probes mission, the Arase satellite offers a unique opportunity to continue in‐situ radiation belt and ring current 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 correlation coefficient 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 3.6 = L* ≤ 4.4 range where Arase samples similar magnetic latitudes to Van Allen Probes. Arase tends to record higher flux for energies <670 keV with longer decay times after flux enhancements, particularly for L* < 3.6. Conversely, for energies >1.4 MeV, Arase flux measurements are generally lower than those of Van Allen Probes, especially for L* > 4.4. The correlation coefficient values show that the >1.4 MeV flux from both missions are well correlated, indicating a similar general evolution, although flux magnitudes differ. We perform a preliminary intercalibration between the two missions using the mean ratio of the fluxes as an energy‐ and L*‐ dependent intercalibration factor. The intercalibration factor improves agreement between the fluxes in the 0.58–1 MeV range.
Key Points:
MEPe, HEPH, HEPL, XEPSSD, and MAGEIS/REPT show a good correlation at energies above 300 keV and 3 < L* < 4.6.
Flux measurements at the same energy from the two missions are highly comparable in magnitude.
Intercalibration via energy‐ and L*‐dependent factors improves the agreement between Arase and RBSP.