Six-decade-old space mystery solved with shoebox-sized satellite called a CubeSat

Researchers test the CubeSat A 60-year-old mystery about the source of energetic, potentially damaging particles in Earth's radiation belts has been solved using data from a shoebox-sized satellite built and operated by students. The satellite is called a CubeSat.
Imagine a fully instrumented satellite the size of a half-gallon milk carton. Then imagine that milk carton whirling in space, catching never-before-seen glimpses of atmospheric and geospace processes.
CubeSats, named for the roughly ... More at https://www.nsf.gov/news/news_summ.jsp?cntn_id=243964&WT.mc_id=USNSF_51&WT.mc_ev=click
This is an NSF News item.