Cosmic Rays, Clouds, and Climate

  title={Cosmic Rays, Clouds, and Climate},
  author={Kenneth S. Carslaw and R. G. Harrison and Jasper Kirkby},
  pages={1732 - 1737}
It has been proposed that Earth's climate could be affected by changes in cloudiness caused by variations in the intensity of galactic cosmic rays in the atmosphere. This proposal stems from an observed correlation between cosmic ray intensity and Earth's average cloud cover over the course of one solar cycle. Some scientists question the reliability of the observations, whereas others, who accept them as reliable, suggest that the correlation may be caused by other physical phenomena with… 
Cosmic Rays and Climate
Among the most puzzling questions in climate change is that of solar-climate variability, which has attracted the attention of scientists for more than two centuries. Until recently, even the
Cosmic rays and climate
  • J. Ormes
  • Physics
    Advances in Space Research
  • 2018
Even a small cloud response to changes in the cosmic ray flux could provide a powerful amplification mechanism, enabling energetically minute variations in solar activity to impact the Earth’s
Atmospheric data over a solar cycle: no connection between galactic cosmic rays and new particle formation
Abstract. Aerosol particles affect the Earth's radiative balance by directly scattering and absorbing solar radiation and, indirectly, through their activation into cloud droplets. Both effects are
A review of the relevance of the ‘CLOUD’ results and other recent observations to the possible effect of cosmic rays on the terrestrial climate
The problem of the contribution of cosmic rays to climate change is a continuing one and one of importance. In principle, at least, the recent results from the CLOUD project at CERN provide
Can cosmic rays affect cloud condensation nuclei by altering new particle formation rates?
Although controversial, many observations have suggested that low‐level cloud cover correlates with the cosmic ray flux. Because galactic cosmic rays have likely decreased in intensity over the last
A new look at possible connections between solar activity, clouds and climate
We present a re‐evaluation of the hypothesis of a coupling between galactic cosmic rays, clouds and climate. We have used two independent estimates of low cloud cover from the International Satellite
Cosmic ray flux impact on clouds? An analysis of radiosonde, cloud cover, and surface temperature records from the United States
Summary¶Many scientists have suggested that variations in cosmic ray flux may impact cloudiness at regional, hemispheric, or global scales. However, considerable debate surrounds (a) whether high or


Is there a cosmic ray signal in recent variations in global cloudiness and cloud radiative forcing
In order to evaluate a recent hypothesis of a coupling between galactic cosmic rays, clouds, and climate we have investigated temporal variations in global cloudiness and radiative fluxes at the top
Some doubts concerning a link between cosmic ray fluxes and global cloudiness
Svensmark and Friis‐Christensen (1997, henceforth SFC) showed a strong correlation between cosmic ray flux and ISCCP total cloudiness between 1984 and 1990. They concluded that ionisation by cosmic
Low cloud properties influenced by cosmic rays
  • MarshSvensmark
  • Physics, Environmental Science
    Physical review letters
  • 2000
Surprisingly the influence of solar variability is strongest in low clouds, which points to a microphysical mechanism involving aerosol formation that is enhanced by ionization due to cosmic rays.
Solar variability and the lower atmosphere.
Abstract Mechanisms possibly connecting solar activity to meteorology of the lower atmosphere are reviewed. Besides direct variations of solar visible emission, solar-related fluctuations in some
Correlations of atmospheric dynamics with solar wind‐induced changes of air‐Earth current density into cloud tops
We analyze reported correlations between solar activity and weather and climate and show that in six independent data sets there is a correlation of measured changes in atmospheric dynamics with
Apparent tropospheric response to MeV‐GeV particle flux variations: A connection via electrofreezing of supercooled water in high‐level clouds?
The ionization production by MeV-GeV particles (mostly galactic cosmic rays) in the lower atmosphere has-well defined variations on a day-to-day time scale related to solar activity, and on the
Correlations of atmospheric dynamics with solar activity evidence for a connection via the solar wind, atmospheric electricity, and cloud microphysics
We respond to several criticisms of the view that there is a physical linkage between solar activity and the dynamics of the troposphere and lower stratosphere, and we provide further evidence in
Modulation of the Earth's electric field by cosmic radiation
  • R. Markson
  • Physics, Environmental Science
  • 1981
Positive correlations between cosmic radiation and ionospheric potential (VI) reported here indicate that the electrification of the atmosphere is modulated by changes in ionizing radiation. Analyses