Characteristic months of solar cycle 22

Minimum (1985)

Maximum (1990)

March 85

June 85

Sept. 85

Dec. 85

March 90

June 90

Sept. 90

Dec. 90

TECmean × 10−16 (m−2)

13.6256

9.9864

12.5664

11.272

46.1072

34.8608

44.2696

41.3808

foF2mean (Mhz)

7.0736

5.660824

6.666032

6.321792

10.587448

8.877976

10.540704

10.186752