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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
The effect of high long-lasting solar/geomagnetic activity on pressure fields in the winter northern lower atmosphere
 Bochníček, Josef ; Davídkovová, Hana ; Hejda, Pavel ; Huth, Radan
The effect of high long-lasting solar/geomagnetic activity on stratospheric and tropospheric pressure distributions was investigated in the winter Northern Hemisphere. The analysis concerns winter period (December 1 – March 30) in 1952-2003. Solar activity is characterized by 30 day means of R number, geomagnetic activity by 30 day means of daily sum of Kp index. Stratospheric and tropospheric pressure distributions are described by 30 day mean anomalies in geopotential height (GPH) at 50 hPa/500 hPa. GPH anomalies are computed as the difference between the long-term 30 day averages (covering 33 year period, 1970-2003) and actual 30 day averages. Data are taken from the NCEP/NCAR reanalysis
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The effect of severe geomagnetic storms on the atmospheric circulation in the winter Northern Hemisphere
 Bochníček, Josef ; Davídkovová, Hana ; Hejda, Pavel ; Huth, Radan
The aim of this paper is to investigate the effects of isolated strong geomagnetic storms on the atmospheric circulation in the winter Northern Hemisphere. For this purpose pressure fields between the SLP and 20 hPa level were analyzed in winter months of 1955-2003. The obtained results indicate that the impact of geomagnetic storms is modulated by solar activity, phase of quasibiennial oscillation and by some inherent atmospheric processes such as the appearance of blocks over British Isles.
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