Home » Szabó-Roberts et al. 2021

Preliminary Statistical Comparisons of Spin-Averaged Electron Data From Arase and Van Allen Probes Instruments

Szabó-Roberts M., Y. Y. Shprits, H. J. Allison, R. Vasile, A. G. Smirnov, N. A. Aseev, A. Y. Drozdov, Y. Miyoshi, S. G. Claudepierre, S. Kasahara, S. Yokota, T. Mitani, T. Takashima, N. Higashio, T. Hori, K. Keika, S. Imajo, I. Shinohara, (2021), Preliminary Statistical Comparisons of Spin-Averaged Electron Data From Arase and Van Allen Probes Instruments, J. of Geophys. Res. [Space Physics], 126, e2020JA028929, doi:10.1029/2020JA028929, e2020JA028929 2020JA028929

Abstract

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 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.

Authors (sorted by name)

Allison Aseev Claudepierre Drozdov Higashio Hori Imajo Kasahara Keika Mitani Miyoshi Shinohara Shprits Smirnov Szabó-Roberts Takashima Vasile Yokota

Journal / Conference

Journal Of Geophysical Research (Space Physics)

Bibtex

@article{https://doi.org/10.1029/2020JA028929,
author = {Szabó-Roberts, Mátyás and Shprits, Yuri Y. and Allison, Hayley J. and Vasile, Ruggero and Smirnov, Artem G. and Aseev, Nikita A. and Drozdov, Alexander Y. and Miyoshi, Yoshizumi and Claudepierre, Seth G. and Kasahara, Satoshi and Yokota, Shoichiro and Mitani, Takefumi and Takashima, Takeshi and Higashio, Nana and Hori, Tomo and Keika, Kunihiro and Imajo, Shun and Shinohara, Iku},
title = {Preliminary Statistical Comparisons of Spin-Averaged Electron Data From Arase and Van Allen Probes Instruments},
journal = {Journal of Geophysical Research: Space Physics},
volume = {126},
number = {7},
pages = {e2020JA028929},
keywords = {Arase/ERG, RBSP, intercalibration},
doi = {https://doi.org/10.1029/2020JA028929},
url = {https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2020JA028929},
eprint = {https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2020JA028929},
note = {e2020JA028929 2020JA028929},
abstract = {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 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.},
year = {2021}
}