Ionospheric Summary and Forecast

Ionospheric Summary

(last updated 27 Aug 2025 23:30 UT)

Date T index 27 Aug 102 Observed Australian Regional MUFs Cocos Island Region: No data available during local day. No data available during local night. 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): Near predicted monthly values over the UT day. Monthly T index: Month T index Jul 88 Aug 96 Sep 93

Ionospheric Forecast

(last updated 27 Aug 2025 23:30 UT)

Date T index MUFs 28 Aug 110 Near predicted monthly values 29 Aug 110 Near predicted monthly values 30 Aug 110 Near predicted monthly values COMMENT: ASWFC SWF HF Communications Warning 77 was issued on 27 August and is current for 27-29 Aug. Maximum usable frequencies (MUFs) in the Australian region on UT day 27-Aug were near predicted monthly values. MUFs are expected to be near predicted monthly values over 28-30 Aug. Brief shortwave fadeouts are probable.