Keywords
Cloud formation
Solar activity
How to Cite
Abstract
The article presents a physical mechanism that links solar activity to variations in Earth’s climate through cosmic rays and cloud formation. Svensmark explains how the Sun’s magnetic field modulates the flux of galactic cosmic rays, which in turn affects atmospheric ionisation and the formation of aerosols that can act as condensation nuclei for low clouds. These clouds play a significant role in determining Earth’s albedo and thus its energy balance. The article discusses both satellite observations and laboratory results and relates them to historical climate variations, including carbon-14 data. For physicists, the article provides a rigorous example of how plasma physics, particle radiation, and atmospheric microphysics can be integrated into a comprehensive description of the climate system—and why the topic remains scientifically controversial.
References
Friis-Christensen, E., & Lassen, K. (1991). Length of the solar cycle: An indicator of solar activity closely associated with climate. Science, 254, 698-700.
https://doi.org/10.1126/science.254.5032.698
Friis-Christensen, E., & Lassen, K. (1995). Variations in the length of the solar cycle and their relation to climate change. Journal of Atmospheric and Terrestrial Physics, 57, 835-845.
https://doi.org/10.1016/0021-9169(94)00088-6
Svensmark, H., & Friis-Christensen, E. (1997). Variation of cosmic ray flux and global cloud coverage-A missing link in solar-climate relationships. Journal of Atmospheric and Solar-Terrestrial Physics, 59, 1225-1232.
https://doi.org/10.1016/S1364-6826(97)00001-1
Svensmark, H. (1998). Influence of cosmic rays on Earth's climate. Physical Review Letters, 81, 5027-5030.
https://doi.org/10.1103/PhysRevLett.81.5027
Svensmark, H. (2000). Cosmic rays and Earth's climate. Space Science Reviews, 93, 175-185.
https://doi.org/10.1023/A:1026592411634
Marsh, N., & Svensmark, H. (2000). Cosmic rays and low cloud properties. Physical Review Letters, 85, 5004-5007.
https://doi.org/10.1103/PhysRevLett.85.5004
Raes, F., & Janssens, A. (1985). Ion-induced aerosol formation in a H₂O-H₂SO₄ system. Journal of Aerosol Science, 16, 217-227.
https://doi.org/10.1016/0021-8502(85)90028-X
Turco, R. P., Zhao, J.-K., & Yu, F. (1998). A new source of tropospheric aerosols: Ion-ion recombination. Geophysical Research Letters, 25, 635-638. https://doi.org/10.1029/98GL00253
Yu, F., & Turco, R. P. (2000). Ultrafine aerosol formation by ion-mediated nucleation. Geophysical Research Letters, 27, 883-886.
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