EPT first results

The Energetic Particle Telescope (EPT) is an instrument designed for high-fidelity measurements of the charged particle radiation environment in space. The first EPT flight unit was launched to a polar orbit onboard the Proba-V spacecraft on 7 May, 2013 and following the commissioning phase the first EPT results have been obtained. These results show a good coverage of the near-Earth radiation environment as well as sporadic enhancements caused by Solar Particle Events (SPE). Data from the EPT will help to improve the present radiation environment models, and to cross-calibrate results obtained from a number of coarser in-orbit radiation monitoring devices, such as the ESA Standard Radiation Environment Monitor (SREM).

 

In the figures below, courtesy Stanislav Borisov at Université Catholique de Louvain Center for Space Radiations (CSR) (Belgium), various EPT measurements are depicted. Note that these results are preliminary, and that further analyses and validation work is ongoing as more EPT data is gathered.

 

World map of average proton flux in the 92-126 MeV energy range measured by the EPT

Figure 1: World map of average proton flux in the 92-126 MeV energy range measured by the EPT from 29 May 2013 to 20 August 2013 (isotropic particle environment for particle count-to-flux conversion has been assumed). The South Atlantic Anomaly (SAA) region is clearly seen.

 

World map of average electron flux in the 0.5-0.6 MeV energy range measured by the EPT

Figure 2. World map of average electron flux in the 0.5-0.6 MeV energy range measured by the EPT from 29 May 2013 to 20 August 2013. Aside from the SAA, also the 'polar horn' areas typical for energetic electrons are seen.

World map of average electron flux in the 0.9-1.0 MeV energy range measured by the EPT

Figure 3: World map of average electron flux in the 0.8-1.0 MeV energy range measured by the EPT from 29 May 2013 to 20 August 2013.

World map of average Helium ion (alpha particle) flux in the 365-500 MeV energy range measured by the EPT

Figure 4. World map of average Helium ion (alpha particle) flux in the 365-500 MeV energy range measured by the EPT from 29 May 2013 to 20 August 2013 (isotropic particle environment for particle count-to-flux conversion has been assumed). Aside from protons, the EPT can also discern charged heavier ions. 

 

The EPT concept was originated at the University of Louvain-la-Neuve Center for Space Radiations CSR/UCL (Belgium), and was designed and manufactured by a consortium comprising of QinetiQ Space (Belgium; Prime), Belgian Institute for Space Aeronomy (BISA, Belgium), and ABOA Space Research Oy (ASRO, Finland), together with CSR/UCL (Belgium), under ESA GSTP contract 22582/09/NL/AT


For more information, contact EPT ESA Technical Officer Petteri Nieminen.


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