Ionospheric Summary and Forecast

Ionospheric Summary

(last updated 18 Feb 2026 23:30 UT)

Date T index 18 Feb 87 Observed Australian Regional MUFs Cocos Island Region: Near predicted monthly values during local day. Enhanced by 15% during local night. Niue Island Region: Enhanced by 35% during local day. Enhanced by 20% during local night. Northern Australian Region: Near predicted monthly values during local day. Enhanced by 15% during local night. Southern Australian Region: Depressed by 15% during local day. Near predicted monthly values during local night. Antarctic Region (Casey/Davis/Mawson): Near predicted monthly values over the UT day. Monthly T index: Month T index Jan 96 Feb 88 Mar 87

Ionospheric Forecast

(last updated 18 Feb 2026 23:30 UT)

Date T index MUFs 19 Feb 95 Near predicted monthly values 20 Feb 95 Near predicted monthly values 21 Feb 95 Near predicted monthly values COMMENT: Maximum Usable Frequencies (MUFs) on UT day 18-Feb in the Australian region were near predicted monthly values with moderate depressions observed during local day in the southern Australian region and moderate enhancements observed during local night in the northern Australian region. Spread F and sporadic E were observed at Hobart during local night hours. MUFs are expected to be near predicted monthly values over 19-21 Feb.