| 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 |