Observing Forbush decreases in cloud atShetland |
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Authors: | R. Giles Harrison Maarten H.P. Ambaum |
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Affiliation: | a Department of Meteorology, University of Reading, P.O. Box 243, Earley Gate, Reading RG6 6BB, UK |
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Abstract: | Meteorological measurements from Lerwick Observatory, Shetland (60°09′N, 1°08′W), are compared with short-term changes in Climax neutron counter cosmic ray measurements. For transient neutron count reductions of 10–12%, broken cloud becomes at least 10% more frequent on the neutron minimum day, above expectations from sampling. This suggests a rapid timescale (~1 day) cloud response to cosmic ray changes. However, larger or smaller neutron count reductions do not coincide with cloud responses exceeding sampling effects. Larger events are too rare to provide a robust signal above the sampling noise. Smaller events are too weak to be observed above the natural variability. |
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Keywords: | Cosmic rays Diffuse fraction Atmospheric electricity Solar climate |
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