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Related Experiment Video

Updated: Jul 6, 2026

Surface Mapping of Earth-like Exoplanets using Single Point Light Curves

Surface Mapping of Earth-like Exoplanets using Single Point Light Curves

Published on: May 10, 2020

Cosmic rays, clouds, and climate.

K S Carslaw¹, R G Harrison, J Kirkby

¹Institute for Atmospheric Science, School of the Environment, University of Leeds, Leeds LS2 9JT, UK.

Science (New York, N.Y.)

|December 3, 2002

Summary

This summary is machine-generated.

Galactic cosmic rays may influence Earth's cloud cover and climate. Researchers are investigating the observed correlation between cosmic ray intensity and cloudiness, exploring potential physical mechanisms and alternative explanations.

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Area of Science:

Atmospheric physics
Climate science
Astrophysics

Background:

A proposed link exists between galactic cosmic ray (GCR) intensity and Earth's cloudiness.
An observed correlation between GCRs and cloud cover over a solar cycle has been reported.
The reliability of this observation and potential confounding factors are debated.

Purpose of the Study:

To explore the hypothesis that GCRs influence cloud formation and Earth's climate.
To investigate the physical mechanisms potentially linking GCRs to cloud properties.
To assess whether GCR-cloud interactions could amplify small solar output changes into larger climate variations.

Main Methods:

Analysis of observational data correlating GCR intensity with cloud cover.
Review and theoretical consideration of proposed physical mechanisms for GCR-cloud interactions.
Evaluation of alternative explanations for the observed correlation, such as volcanic activity or El Niño.

Main Results:

An observed correlation between cosmic ray intensity and average cloud cover over a solar cycle has been noted.
Skepticism exists regarding the reliability of the observational data.
Alternative geophysical phenomena or climate patterns (e.g., El Niño) are suggested as potential causes for the correlation.

Conclusions:

The observed correlation between GCRs and cloudiness presents an intriguing possibility for climate modulation.
Proposed physical mechanisms require further investigation to validate the GCR-cloud interaction hypothesis.
The finding could offer insights into how minor solar variations impact Earth's climate, but requires more research.