Recent content by toadehep

many experiments are designed to measure the cosmic ray spectrum, including space probes. what confues me most is that, when considering the geometry factor of the detector, how can we decide the steradan and what is the reference point in outerspace?

thanks. suppose there is a piece of board in outer space, how to calculate its steradian? what is the reference point?

the unit of cosmic ray flux is expressed as flux /(m^2.sr.s.GeV), so what does sr stand for? Thanks.