Ionospheric Summary and Forecast

Ionospheric Summary

(last updated 22 Aug 2026 23:30 UT)

Date T index 22 Aug 77 Observed Australian Regional MUFs Cocos Island Region: No data available during local day. No data available during local night. Niue Island Region: No data available during local day. No data available during local night. Northern Australian Region: Near predicted monthly values during local day. Enhanced by 15% during local night. Southern Australian Region: Near predicted monthly values. Antarctic Region (Casey/Davis/Mawson): Enhanced by 15% over the UT day. Monthly T index: Month T index Jul 75 Aug 64 Sep 61

Ionospheric Forecast

(last updated 22 Aug 2026 23:30 UT)

Date T index MUFs 23 Aug 80 Near to 15% above predicted monthly values 24 Aug 80 Near to 15% above predicted monthly values 25 Aug 80 Near to 15% above predicted monthly values COMMENT: ASWFC SWF HF Communications Warning 76 was issued on 22 August and is current for 23-25 Aug. Maximum usable frequencies (MUFs) in the Australian region on UT day 22-Aug were near predicted monthly values, with enhancements observed in the northern Australian region during local night. Spread F was observed at Perth during local night hours. MUFs are expected to be near predicted monthly values to 15% enhanced over 23-25 Aug. Shortwave fadeouts are possible.