Blog - Antiproton Radiation Belt Discovered Around Earth: Now the PAMELA team has analysed the 850 days of data, looking only at the times when the spacecraft was in the South Atlantic Anomaly (about 1.7 per cent of this time).
Lo and behold, these guys found 28 antiprotons. That's about three orders of magnitude more than you'd expect to find in the solar wind, proving that the particles really are trapped and stored in this belt.
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