# Cosmic rays,Climate and the CERN CLOUD Experiment

- Institution: CERN
- Department: CERN Colloquium
- Speaker: Jasper Kirkby
- Year: 2011
- Language: English
- Subjects: Earth and environment
- Source: [CERN](https://videos.cern.ch/record/3007373)
- Licence: [CERN](http://copyright.web.cern.ch)
- Who can watch: Tweens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

For more than two centuries, scientists have been puzzled by observations of solar-climate variability yet the lack of any established physical mechanism. Some recent observations, although disputed, suggest that clouds may be influenced by cosmic rays, which are modulated by the solar wind. The CLOUD experiment aims to settle the question of whether or not cosmic rays have a climatically-significant effect on clouds by carrying out a series of carefully-controlled measurements in a large cloud chamber exposed to a beam from the CERN PS. This talk will present the scientific motivation for CLOUD and the first results, which have recently been published in Nature (Kirkby et al. (2011). Role of sulphuric acid, ammonia and galactic cosmic rays in atmospheric aerosol nucleation. Nature 476, 429-433)..

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## Lectures

1. [Cosmic rays,Climate and the CERN CLOUD Experiment](https://invisiblenetwork.ai/learn/cern/3007373/fa0707ce3fd8), 1 h 7 min (CERN's player)