摘要：We analyzed peak electron densities ( N m F 2) and peak heights ( h m F 2)of F 2 layer, measured by a digisonde at Anyang (37.4°N, 127.0°E, Geomag = 27.7°N, 196.9°E) during the period of April 1998 through April 2008.The Anyang N m F 2 and h m F 2 values averaged over each month show generally good linear relationship with increasing solar activities for all local time and for various geomagnetic activities.The change of the noon N m F 2 with increasing solar flux indices ( F 10.7) is much slower in summer than in other seasons, and the N m F 2 difference between noon and midnight is minimized in summer.The h m F 2 varies with F 10.7 from 200 km to 350 km at noon and from 300 to 450 km at midnight, but the h m F 2 variations do not show seasonal difference significantly for all local time.The semi-annual variations of N m F 2 and h m F 2 are apparent and the winter anomaly of N m F 2 is also clearly seen for most cases of geomagnetic and solar activities.The Anyang N m F 2 values are in good agreement with the IRI 2007 model except for high solar and geomagnetic activity cases.However, the Anyang h m F 2 values at midnight are significantly higher than the IRI model, being higher by up to ∼100 km for high solar activities. Key words N m F 2 h m F 2 ionosonde mid-latitude ionosphere climatology.
关键词：N m F 2 ; h m F 2 ;ionosonde ;mid-latitude ionosphere ;climatology
