Particle Flux Unit (pfu)
Particle Flux Unit (pfu) :
A unit used to measure the rate at which energetic particles, such as protons, are received by spacecraft. These flux rates are a major component of the "space weather," the environment in which satellites and other spacecraft operate. One pfu is a rate of one particle per square centimeter of detector area per steradian of solid angle scanned per second of time. (A steradian is about 7.96% of a sphere.) In SI units, 1 pfu = 10-4 m-2sr-1s-1
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