BBC News | In graphics: Climate change and the Sun: three theories, Ultraviolet connection

Ultraviolet connection

The Sun's ultraviolet output varies by much more than 0.1% over a solar cycle. High UV conditions stimulate more ozone production in the stratosphere, and there is evidence that this can affect climate at the Earth's surface.

But the scale appears to be much smaller than changes brought by increased greenhouse gas levels.


�In graphics:�Climate change and the Sun: three theories

	Ultraviolet connection The Sun's ultraviolet output varies by much more than 0.1% over a solar cycle. High UV conditions stimulate more ozone production in the stratosphere, and there is evidence that this can affect climate at the Earth's surface. But the scale appears to be much smaller than changes brought by increased greenhouse gas levels.