Comparative Analysis of Solar Activity Influences on Trajectories of Extratropical Cyclones in Different Regions of the North Atlantic

Influences of solar activity on the latitudinal position of the main trajectories (storm tracks) of extratropical cyclones were compared in different regions of the North Atlantic: 1) the western North Atlantic (60-40W), which is a region of intensive cyclone formation and deepening; 2) the Icelandic Low region (30-10W), where cyclones usually reach their maximum development and their occurrence is maximal; 3) the eastern North Atlantic (0-20E), where processes of cyclone filling become dominating.It was found that secular oscillations (with periods ~80-90 years) of storm track latitudes, which may be associated with the solar Gleissberg cycle, strongly dominate in the western North Atlantic.These oscillations weaken in the Icelandic Low region and disappear to the east of Greenwich (0-20E), where multidecadal oscillations (with periods ~60 years) were detected.On the bidecadal time scale, oscillations of storm track latitudes, with periods close to the Sun's magnetic Hale cycle, were found in all the studied regions of the North Atlantic.Storm tracks noticeably shift to the north in even solar cycles (according to the Zurich numbering) and slightly to the south in odd ones.The 22-year oscillations are most pronounced in the Icelandic Low region and weaken sharply east of Greenwich.The obtained results show that the region of the Icelandic Low seems to be most sensitive to solar activity influences.