Naslov
Forbush Decreases and Clouds: Do changes in Cosmic Ray intensity influence the Cloud Cover?

Autori
Čalogović, Jaša ; Arnold, Frank ; Desorgher, Laurent ; Flückiger, O. Erwin ; Stubenrauch, J. Claudia ; Beer Jürg

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, ostalo

Skup
Space Climate Symposium 3

Mjesto i datum
Saariselkä, Finska, 14.03.2009. - 22.03.2009

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Forbush decrease; cosmic rays; cloud cover; climate

Sažetak
The cosmic ray cloud hypothesis postulates that fluctuations in cosmic ray intensity cause significant changes in the Earth’s cloud cover, with important consequences for the climate. According to Svensmark and Friis Christensen (1997), the global cloud cover changed in phase with the GCR flux by 2-3% during one solar cycle. Further studies neither confirmed nor completely denied this hypothesis, initiating heavy debates in the scientific community. Instead of analyzing cosmic ray changes over the 11-year solar cycle, we concentrate on rapid changes, so-called Forbush decreases, which are comparable in amplitude but last only about a week. For each of six selected Forbush decreases, extensive Monte Carlo simulations were carried out to calculate the global change in the atmospheric ion production rate. For each grid cell, the ion production change was compared with the corresponding cloud data change allowing for time lags ranging from 0 to 10 days. The results of these comparisons for different cloud heights, latitudes, and areas will be presented and discussed.

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Geologija

POVEZANOST RADA