Van Allen belts contain high energy electrons and protons, but what about the area between the belts?
Is it "regular" space, just like it is past the belts? Anything interesting going on there? "Just" exosphere?
I suspect that it is more protected by the Earth's magnetic field than the space past the belts -- when compared to the side facing the sun, correct?
Google searches for "between Van Allen belts" and similar don't come up with much useful data.