Ionospheric Summary and Forecast

Ionospheric Summary

(last updated 16 Oct 2026 23:30 UT)

Date T index 16 Oct 54 Observed Australian Regional MUFs Cocos Island Region: No data available during local day. No data available during local night. Niue Island Region: Enhanced by 15% during local day. Near predicted monthly values during local night. Northern Australian Region: Near predicted monthly values. Southern Australian Region: Mostly near predicted monthly values. Depressed by 20% after local dawn. Antarctic Region (Casey/Davis/Mawson): Near predicted monthly values over the UT day. Monthly T index: Month T index Sep 61 Oct 60 Nov 58

Ionospheric Forecast

(last updated 16 Oct 2026 23:30 UT)

Date T index MUFs 17 Oct 60 Near predicted monthly values 18 Oct 60 Near predicted monthly values 19 Oct 60 Near predicted monthly values COMMENT: ASWFC SWF HF Communications Warning 88 was issued on 15 October and is current for 15-17 Oct. Maximum Usable Frequencies (MUFs) in the Australian region were mostly near predicted values on UT day 16-Oct, with some depressions observed after local dawn in the southern Australian region. Additional depressions were observed early in the UT day at Perth and Learmonth. Strong sporadic E was observed at Canberra and Hobart during local night hours, with spread F also observed at Hobart. MUFs are forecast to be near predicted values over 17-19 Oct. Shortwave fadeouts are possible.