Template:PD-USGov-ARM/en

This photograph was produced by the Atmospheric Radiation Measurement Program.

Their site states:

• Any of the below images or graphics may be reproduced and published at your discretion. Please use the following credit line: "Courtesy: U.S. Department of Energy's Atmospheric Radiation Measurement Program."

Additionally, the ARM program is part of the U.S. Department of Energy, whose images are in the public domain in the United States.