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Further development of the method proposed by Danilov and Mikhailov is presented. The method is applied to reveal the foF2 long-term trends on 30 Northern Hemisphere ionosonde stations. Most of them show signi®cant foF2 trends. A pronounced dependence of trend magnitude on geomagnetic (invariant) latitude is con®rmed. Periods of negative/positive foF2 trends corresponding to the periods of long-term increasing/ decreasing geomagnetic activity are revealed for the ®rst time. Pronounced diurnaldoi:10.1007/s005850000232 fatcat:liehnmn7lnch3euhoevblcnrti