Regensburg 2007 – wissenschaftliches Programm

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SYEE: Symposium Energy and Extraterrestrial Influences on the Climate

SYEE 1: Symposium: Energy an Extraterrestrial Influences on the Climate

SYEE 1.1: Hauptvortrag

Dienstag, 27. März 2007, 09:30–10:15, H46

Cosmic Rays, Clouds and Climate — •Henrik Svensmark — Danish Space Research Institute, Juliane Maries Vej 30, DK-2100 Copenhagen, Denmark

Changes in the intensity of galactic cosmic rays seems alter the Earth’s cloudiness. A recent experiment has shown how electrons liberated by cosmic rays assist in making aerosols, the building blocks of cloud condensation nuclei, while anomalous climatic trends in Antarctica confirm the role of clouds in helping to drive climate change. Variations in the cosmic-ray influx due to solar magnetic activity account well for climatic fluctuations on decadal, centennial and millennial timescales. Over longer intervals, the changing galactic environment of the Solar System has had dramatic consequences, including Snowball Earth episodes.