Ionospheric Summary and Forecast

Ionospheric Summary

(last updated 16 Sep 2025 23:30 UT)

Date T index 16 Sep 96 Observed Australian Regional MUFs Cocos Island Region: No data available. Niue Island Region: Mostly near predicted monthly values. Northern Australian Region: Near predicted monthly values. Southern Australian Region: Near predicted monthly values. Antarctic Region (Casey/Davis/Mawson): Depressed by 30% over the UT day. Monthly T index: Month T index Aug 96 Sep 92 Oct 90

Ionospheric Forecast

(last updated 16 Sep 2025 23:30 UT)

Date T index MUFs 17 Sep 100 Near predicted monthly values 18 Sep 100 Near predicted monthly values 19 Sep 100 Near predicted monthly values COMMENT: ASWFC HF Communications Warning 84 was issued on 15 September and is current for 15-17 Sep. Maximum usable frequencies (MUFs) on UT day 16-Sep were mostly near predicted values. Spread-F was observed in Perth and Hobart during local night hours. MUFs are expected to be near predicted values on 17-19 Sep.