The Van Allen Probes (VAP) were two craft that were launched into highly elliptical orbits to study the composition, energies, and the dynamic nature of Earth’s trapped radiation. Learn more about the VAP radiation sensors here .
See below for an interactive visualization of the omnidirectional proton and electron flux as measured by sensors on board Van Allen Probe A, and as predicted by the AE9 and AP9 models of trapped radiation accessed through our API. View on mobile and smaller screens here .
We acknowledge G. Reeves and the ECT team for use of the sensor data. See here and here for technical details of the MagEIS and REPT sensors, respectively. Further validation studies are available on the AFRL