A new paper in press at Elsevier finds air pressure changes linked to Forbush Decreases in the extra-tropics. These can affect the regime of blocking highs and the landfall of cyclonic weather systems. The paper marks a further step forward in understanding solar-terrestrial relations.
Atmospheric pressure variations at extratropical latitudes associated with Forbush decreases of galactic cosmic rays
I. Artamonovaa,a S. Veretenenkoa,b
a St. Petersburg State University, St. Petersburg 198504, Russia
b Ioffe Physical-Technical Institute, St. Petersburg 194021, Russia
Changes of troposphere pressure associated with short-time variations of galactic cosmic rays (GCRs) taking place in the Northern hemisphere’s cold months (October–March) were analyzed for the period 1980–2006, NCEP/NCAR reanalysis data being used. Notice- able pressure variations during Forbush decreases of GCRs were revealed at extratropical latitudes of both hemispheres. The maxima of pressure increase were observed on the 3rd–4th days after the event onsets over Northern Europe and the European part of Russia in the Northern hemisphere, as well as on the 4th–5th days over the eastern part of the South Atlantic opposite Queen Maud Land and over the d’Urville Sea in the Southern Ocean. According to the weather chart analysis, the observed pressure growth, as a rule, results from the weakening of cyclones and intensification of anticyclone development in these areas. The presented results suggest that cosmic ray vari- ations may influence the evolution of extratropical baric systems and play an important role in solar-terrestrial relationships.