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"On correlations between the North Atlantic Oscillation, geopotential
heights, and geomagnetic activity", by P. Thejll, B. Christiansen and
H. Gleisner, a paper accepted for publication in the GRL. (click for pdf
preprint here) "Variations of
atmospheric pressure during solar proton events and Forbush decreases for
different latitudinal and synoptic zones", by Anna L. Morozova, M.I.
Pudovkin and Peter Thejll, International Journal of Geomagnetism and Aeronomy,
3, 181-189, (2002). Download link here.