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Annals of Geophysics
In this study, probable signature of the mid-latitude electron density trough at the ionospheric critical frequencies (foF2) is investigated. For this purpose, hourly ionospheric critical frequencies data obtained from ionosonde stations for the year 1972 are used. These stations are situated between 45 o -65 o invariant magnetic latitudes (Λ) of the Northern hemisphere. The foF2 data are examined depending on local time (LT), seasons, Λ and geomagnetic activity (K p ) variation. The resultsdoi:10.4401/ag-7065 fatcat:fn3iiqsadfemzeq7xdbqno7sja