Petrified tree rings tell ancient tale of sun’s behavior

Variations in growth rate match today’s 11-year solar cycle, study claims

tree rings

ANTIQUE RINGS  The rings in trees buried by volcanic eruptions hundreds of millions of years ago show evidence of climate variations caused by the 11-year solar cycle, researchers report.

L. Luthardt and R. Rößler

This article is only available to Science News subscribers.

Subscribers, enter your e-mail address to access our archives.

Not a subscriber?

Science News is a nonprofit.

Support us by subscribing now.

More Stories from Science News on Climate

From the Nature Index

Paid Content