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Name: delappkc
Status: N/a
Age: N/A
Location: N/A
Country: N/A
Date: Around 1993

What energy range are cosmic rays in are cosmic rays in when they hit the earth? Does the rate of cosmic rays hitting the earth change over time , if so how?

As far as I know, cosmic rays come in just about any energy range, up to extremely high energies (higher than anything that can be produced in an accelerator on earth). That is before they hit the atmosphere though. By the time they reach the ground I think most of the high energy ones have scattered to produce secondary "showers". The rate of cosmic ray influx does change with time - specifically with the solar cycle. When the sun is active, cosmic rays are not, and vice versa.

A. Smith

Actually, when the sun is active, it sends out streams of high energy protons. These cause the Aurora borealis in the northern hemisphere and present a serious radiation hazard to astronauts.

John Hawley

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