Ionospheric Summary and Forecast
Ionospheric Summary
(last updated 27 Jul 2026 23:30 UT)
Date T index 27 Jul 77 Observed Australian Regional MUFs Cocos Island Region: No data available during local day. No data available during local night. Niue Island Region: Enhanced by 20% during local day. Near predicted monthly values during local night. Northern Australian Region: Near predicted monthly values during local day. Depressed by 15% during local night. Southern Australian Region: Mostly near predicted monthly values. Enhanced by 20% after local dawn. Antarctic Region (Casey/Davis/Mawson): Enhanced by 15% over the UT day. Monthly T index: Month T index Jun 81 Jul 66 Aug 63
Ionospheric Forecast
(last updated 27 Jul 2026 23:30 UT)
Date T index MUFs 28 Jul 70 Near predicted monthly values 29 Jul 70 Near predicted monthly values 30 Jul 70 Near predicted monthly values COMMENT: ASWFC SWF HF Communications Warning 69 was issued on 27 July and is current for 27-28 Jul. Maximum Usable Frequencies (MUFs) in the Australian region were mostly near predicted monthly values on UT day 27-Jul, with 15% depressions observed in the northern Australian region during local night hours. Spread-F was observed at Learmonth and Hobart during local night hours. MUFs are expected to be near predicted monthly values over 28-30 Jul. Isolated minor shortwave fadeouts are possible.
