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AGU: Geophysical Research Letters

 

Keywords

  • forbush decrease
  • clouds
  • cosmic rays

Index Terms

  • Interplanetary Physics: Cosmic rays
  • Ionosphere: Solar radiation and cosmic ray effects
  • Atmospheric Processes: Clouds and aerosols
  • Atmospheric Composition and Structure: Aerosols and particles
  • Global Change: Atmosphere

Abstract

GEOPHYSICAL RESEARCH LETTERS, VOL. 37, L03802, 5 PP., 2010
doi:10.1029/2009GL041327

Sudden cosmic ray decreases: No change of global cloud cover

J. Calogovic

Hvar Observatory, Faculty of Geodesy, Zagreb, Croatia

C. Albert

Eawag, Dübendorf, Switzerland

F. Arnold

Max Planck Institute for Nuclear Physics, Heidelberg, Germany

J. Beer

Eawag, Dübendorf, Switzerland

L. Desorgher

Physikalisches Institut, University of Bern, Bern, Switzerland

E. O. Flueckiger

Physikalisches Institut, University of Bern, Bern, Switzerland

Currently a cosmic ray cloud connection (CRC) hypothesis is subject of an intense controversial debate. It postulates that galactic cosmic rays (GCR) intruding the Earth's atmosphere influence cloud cover. If correct it would have important consequences for our understanding of climate driving processes. Here we report on an alternative and stringent test of the CRC-hypothesis by searching for a possible influence of sudden GCR decreases (so-called Forbush decreases) on clouds. We find no response of global cloud cover to Forbush decreases at any altitude and latitude.

Received 14 October 2009; accepted 4 January 2010; published 3 February 2010.

Citation: Calogovic, J., C. Albert, F. Arnold, J. Beer, L. Desorgher, and E. O. Flueckiger (2010), Sudden cosmic ray decreases: No change of global cloud cover, Geophys. Res. Lett., 37, L03802, doi:10.1029/2009GL041327.

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