Ionospheric Summary and Forecast
Ionospheric Summary
(last updated 10 Aug 2026 23:30 UT)
Date T index 10 Aug 35 Observed Australian Regional MUFs Cocos Island Region: No data available during local day. No data available during local night. Niue Island Region: Depressed by 15% during local day. Depressed by 30% during local night. Northern Australian Region: Near predicted monthly values during local day. Depressed by 30% during local night. Southern Australian Region: Depressed by 15% during local day. Depressed by 20% during local night. Antarctic Region (Casey/Davis/Mawson): Depressed by 15% over the UT day. Monthly T index: Month T index Jul 75 Aug 64 Sep 61
Ionospheric Forecast
(last updated 10 Aug 2026 23:30 UT)
Date T index MUFs 11 Aug 40 Depressed 15%/near predicted monthly values 12 Aug 45 Near predicted monthly values 13 Aug 45 Near predicted monthly values COMMENT: ASWFC HF Communications Warning 71 was issued on 10 August and is current for 11 Aug only. Maximum Usable Frequencies (MUFs) in the Australian region on UT day 10-Aug were depressed by 15-30%, with the strongest depressions observed in northern Australia during local night hours. Spread F was observed at several Australian sites during local night hours. MUFs are forecast to be near predicted monthly values to 15% depressed on 11-Aug, then near predicted monthly values over 12-13 Aug.
