Guest post fromm Tim Cullen. Be sure to visit his site MalagaBay.
In 1996 Henrik Svensmark and Eigil Friis-Christensen discovered a connection between cosmic rays and global cloud cover.
In 1996 a surprising discovery was announced that the intensity of cosmic rays incident on the earth’s atmosphere correlates closely with variations of global cloud cover [Svensmark and FriisChristensen 1996].
Clouds both reflect incoming and trap outgoing radiation, and they thus play an important role in the Earth’s radiation budget.
Center for Sun-Climate Research – Technical University of Denmark
The discovery revealed a 2% variation in cloud cover during the solar sunspot cycle.
The reported variation of cloud cover was approximately 2% over the course of a sunspot cycle.
This may appear to be quite small; however, the possible consequences on the global radiation (energy) budget are not.