JpGU-AGU Joint Meeting 2017

Presentation information

[EE] Oral

P (Space and Planetary Sciences) » P-CG Complex & General

[P-CG23] [EE] Future missions and instrumentation for space and planetary science

Wed. May 24, 2017 1:45 PM - 3:15 PM A03 (Tokyo Bay Makuhari Hall)

convener:Satoshi Kasahara(The university of Tokyo), Shingo Kameda(School of Science, Rikkyo University), Mitsunori Ozaki(Faculty of Electrical and Computer Engineering, Institute of Science and Engineering, Kanazawa University), Yoshiya Kasahara(Information Media Center, Kanazawa University), Chairperson:Satoshi Kasahara (The university of Tokyo)

1:45 PM - 2:00 PM

[PCG23-01] Contamination in electron observations from Cluster/RAPID/IES instrument in the Earth's radiation belts and ring current

★Invited papers

*Elena Kronberg1,2, Mikhail Rashev1, Patrick W. Daly1, Yuri Shprits3, Drew Turner4, Alexander Drozdov10, Mikhail Dobynde5, Adam Kellerman10, Ted Fritz6, Vivien Pierrard7, Kris Borremans7, Berndt Klecker8, Reiner Friedel9 (1.Max Planck Institute for Solar System Research, Göttingen, Germany, 2.Ludwig Maximilians University, Munich, Germany, 3.Helmholtz Centre Potsdam GFZ German Research Centre For Geosciences and University of Potsdam, Potsdam, Germany, 4.The Aerospace Corporation, El Segundo, California USA, 5.Skolkovo Institute of Science and Technology, Skolkovo, Russia, 6.Center for Space Physics, Boston University, Boston, MA, USA, 7.Belgian Institute for Space Aeronomy (BISA), Brussels, Belgium, 8.Max Planck Institute for extraterrestrial Physics, Garching, Germany, 9.Space Science and Applications, Los Alamos National Laboratory, Los Alamos, New Mexico USA, 10.Department of Earth Planetary and Space Sciences, University of California, Los Angeles, CA, USA)

Keywords:particle detector, contamination, radiation belts

For over 16 years, the Cluster mission passes through Earth’s radiation belts at least once every two days for several hours, measuring the energetic electron intensity at energies from 30 to 400 keV. This vast amount of data has previously been considered as rather useless due to contamination by penetrating energetic particles (protons at >100 keV and electrons at >400 keV). In this study, we assess the efficiency with which aluminium shielding of RAPID/IES detector filters out contaminating high-energy electrons and protons. We base our estimation on the analysis of experimental data and a radiation transport code (Geant4). In our simulations, we use the incident particle energy distribution of the AE9/AP9 radiation belt models. We identify the Roederer L-values and energy channels that should be used with caution and show examples of misinterpreting the data. Comparison of the data with electron and proton observations from RBSP/MagEis indicates that the subtraction from the IES electron data of proton intensities at energies ~230–630 keV cleans well the data from the proton contamination. We show that the data from this detector measured in the radiation belts is still useful for many scientific applications. This is very valuable as it provides one of the longest available radiation belt data sets.