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Observing Forbush decreases in cloud at Shetland

Harrison, R. G. ORCID: and Ambaum, M. H. P. ORCID: (2010) Observing Forbush decreases in cloud at Shetland. Journal of Atmospheric and Solar-Terrestrial Physics, 72 (18). pp. 1408-1414. ISSN 1364-6826

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To link to this item DOI: 10.1016/j.jastp.2010.09.025


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.

Item Type:Article
Divisions:Science > School of Mathematical, Physical and Computational Sciences > Department of Meteorology
ID Code:16197

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