Fig. 1
From: A climatology study on ionospheric F2 peak over Anyang, Korea
The NmF2 variation with solar activity for low, moderate and high geomagnetic conditions in January, April, July and October at midnight (0–1 LT) (circle) and at noon (12–13 LT) (triangle). Solid and dashed lines are the linear fitting of the digisonde data at noon and at midnight. The “+” and “×” symbols are averaged NmF2 values of the IRI-2007 model at noon and midnight for the corresponding cases, respectively.