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Five Single Station Models (SSM's) for hourly monthly median values of the critical frequency of the ionospheric F2 layer (foF2) obtained from vertical-incidence sounding and global IRI-95 and PRIME/CCIR models have been compared using data from 22 European ionospheric stations. The stations are conveniently distributed to cover the COST 251 area (10 degrees W-60 degrees E, 35 degrees N-70 degrees...
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