NASA Keeps a Close Eye on the Sun's Irradiance

For more than two centuries, scientists have wondered how much heat and light the sun expels, and whether this energy varies enough to change Earth?s climate. In the absence of a good method for measuring the sun's output, the scientific conversation was often heavy with speculation.


"When you look at longer scales on the sun, it's the opposite," said Lean, a solar scientist at the U.S. Naval Research Laboratory in Washington, D.C., and a member of Glory's science team. "Overall, irradian [...]

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