Ionospheric Summary and Forecast

Ionospheric Summary

(last updated 27 Feb 2026 23:30 UT)

Date T index 27 Feb 79 Observed Australian Regional MUFs Cocos Island Region: Near predicted monthly values. Niue Island Region: Mostly near predicted monthly values. Northern Australian Region: Near predicted monthly values. Southern Australian Region: Depressed by 25% 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 27 Feb 2026 23:30 UT)

Date T index MUFs 28 Feb 90 Near predicted monthly values 01 Mar 75 Depressed 10 to 15%/near predicted monthly values 02 Mar 90 Near predicted monthly values COMMENT: Maximum usable frequencies (MUFs) in the southern Australian region on UT day 27-Feb were depressed 25% during the local day. Northern Australian region MUFs remained near predicted monthly values. Sporadic-E was observed at times at Niue and Canberra. MUFs are generally expected to be near predicted values over 28-Feb to 02-Mar, with the chance of southern Australian region MUFs becoming 15% depressed on 01-Mar if a weak CME arrival eventuates on 28-Feb.