Ionospheric Summary and Forecast

Ionospheric Summary

(last updated 19 Sep 2026 23:30 UT)

Date T index 19 Sep 60 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: Mostly 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 Aug 66 Sep 62 Oct 60

Ionospheric Forecast

(last updated 19 Sep 2026 23:30 UT)

Date T index MUFs 20 Sep 60 Near predicted monthly values 21 Sep 60 Near predicted monthly values 22 Sep 60 Near predicted monthly values COMMENT: Maximum Usable Frequencies (MUFs) in the Australian region were mostly near predicted values on 19-Sep, with some enhancements observed at Niue Island. Mild spread-F was observed in the southern Australian region during local night hours, with strong spread-F observed at Hobart. MUFs are forecast to remain near predicted values over 20-22 Sep.