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Forbush Decreases and Antarctic cloud anomalies in the upper troposphere

journal contribution
posted on 2023-06-08, 10:56 authored by Benjamin A Laken, Dominic KnivetonDominic Kniveton
We demonstrate evidence that past composite based studies centred around the onset of Forbush decrease (FD) events may have improperly isolated the maximal galactic cosmic ray (GCR) decrease associated with the FD events. After an adjustment of the composite to account for such shortcomings we find indications of anomalous cloud cover decreases (of around 3%) located in the upper levels of the troposphere at high southern latitudes. These cloud changes are detectable after latitudinal averaging, suggesting the possibility of a second order relationship between the rate of GCR flux and cloud cover in this region. The maximal cloud change is observed in advance of the maximal GCR decrease; this implies that if the observed cloud changes bear a causal relationship to the rate of GCR flux, then cloud properties may be sensitive to changes in GCR conditions rather than the maximal deviations themselves.

History

Publication status

  • Published

Journal

Journal of Atmospheric and Solar-Terrestrial Physics

ISSN

1364-6826

Publisher

Elsevier

Issue

2-3

Volume

73

Page range

371-376

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2012-02-21

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