Ionospheric Summary and Forecast

Ionospheric Summary

(last updated 07 Aug 2025 23:30 UT)

Date T index 07 Aug 92 Observed Australian Regional MUFs Cocos Island Region: Enhanced by 20% during local day. Near predicted monthly values during local night. Niue Island Region: Near predicted monthly values. Northern Australian Region: Near predicted monthly values during local day. Depressed by 20% during local night. Southern Australian Region: Near predicted monthly values. Antarctic Region (Casey/Davis/Mawson): Near predicted monthly values over the UT day. Monthly T index: Month T index Jul 88 Aug 96 Sep 93

Ionospheric Forecast

(last updated 07 Aug 2025 23:30 UT)

Date T index MUFs 08 Aug 80 Near predicted monthly values 09 Aug 80 Near predicted monthly values 10 Aug 90 Near predicted monthly values COMMENT: Maximum usable frequencies (MUFs) in the Australian region on UT day 08-Aug were near predicted monthly values, with 20% depressions observed in the northern Australian region during local night hours. Spread F was observed at Hobart and Perth during local night hours. MUFs are expected to be near predicted monthly values over 08-10 Aug, with a slight chance of mild depressions over 08-09 Aug due to expected geomagnetic activity. Shortwave fadeouts are possible.