For ten points, name these bands of energetic charged particles around the Earth, which are trapped in position by the Earth's magnetic field.
Robyn Millan is leading an experiment called BARREL to study these, while a previous cancelled experiment to study them was called IMEX. A proposal by Robert Foyt called HiVolt is aimed at drawing energy from these entities which contain a "safe zone" caused by VLF waves, and that reside in the Chapman Ferraro Cavity.  They were discovered by Explorer I in 1958, and the are formed due to a magnetic-mirror effect. The inner one is made mostly of high energy protons, while the outer one is mostly composed of electrons. For ten points, name these bands of energetic charged particles around the Earth, which are trapped in position by the Earth's magnetic field.
Robyn Millan is leading an experiment called BARREL to study these, while a previous cancelled experiment to study them was called IMEX.
{Van Allen} radiation belts