Abstract CARMEN 3 and CARMEN 4 are two missions developed by the CNES to measure flux particle levels in the radiation belts. These two missions consist in embedding the CNES-developed ICARE-NG instrument on both the JASON-3 satellite (LEO: 1336 km, 66°) and the E7C satellite (GEO with EOR posting) for respectively CARMEN 3 and CARMEN 4. During the CARMEN 4 EOR phase (21.06.2019 to 30.10.2019), E7C run through the same range () as JASON-3 during the same period. As these two satellites are equiped with the same ICARE-NG instrument but are not at the same altitude, it is relevant to compare the electron flux temporal evolution measured on both satellites. Common electron energies measured by ICARE-NG during CARMEN 3 and CARMEN 4 are 1.6 MeV and 1.8 MeV. Studying temporal electron flux evolution for both missions, we notice for both a remarkable exponential decay of the flux level subsequently to a rapid filling of the outer radiation belt due to an important solar activity (geomagnetic storm). This exponential decay is characterised with a timescale which depends on the mission, the energy, the value, and the concerned exponential decay. These timescales are compared to several previously published estimates. Then, noticing that electron flux temporal evolution have the same dynamics for both missions, we find a projection function from one to the other using classical statistics methods (linear regression, with least squares method). We find that the correlation between CARMEN 3 and CARMEN 4 data depends on the value of Roederer’s parameter. The correlation coefficient is higher than 0.6 for and smaller otherwise. We notice a global same trend of electron flux temporal evolution from both missions. However, the correlation is limited by irregularities in the electron flux measured by CARMEN 3. The causes of these irregularities are discussed and explained.
Comparison of relativistic electron flux at Low Earth Orbit (LEO) and Electric Orbit Raising (EOR) from the CARMEN Missions
Advances in Space Research ; 71 , 10 ; 4401-4409
2023-01-02
9 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Electron flux , LEO , EOR , Exponential decay , CARMEN
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