Precipitation, cloud cover and Forbush decreases in galactic cosmic rays

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Abstract

The results of a study to explore variations in cloud cover, over regions that are minimally affected by rainfall and heavy rainfall, and that are coincident with variations in the galactic cosmic ray flux, are presented. Using an extensive record of global satellite derived cloud and rainfall products from the International Satellite Cloud Climatology Project D1 data series and Xie and Arkin (J. Climate 9 (1996) 840), epoch superposition analysis of a sample of events of short term decreases in the galactic cosmic ray flux, is conducted. Analysis of data that is largely free from the influence of rainfall and heavy rainfall, averaged over 10-degree geomagnetic latitude (φ) bands reveals that cloud cover is reduced at high latitudes, and at middle and lower (including equatorial) latitudes over regions of relatively higher cloud cover, over both land and ocean surfaces, while increasing over ocean surfaces at middle and lower latitudes in regions of thinner cloud. © 2004 Elsevier Ltd. All rights reserved.

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Kniveton, D. R. (2004). Precipitation, cloud cover and Forbush decreases in galactic cosmic rays. Journal of Atmospheric and Solar-Terrestrial Physics, 66(13-14 SPEC. ISS.), 1135–1142. https://doi.org/10.1016/j.jastp.2004.05.010

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