Ionospheric Summary and Forecast

Ionospheric Summary

(last updated 11 Apr 2026 23:30 UT)

Date T index 11 Apr 67 Observed Australian Regional MUFs Cocos Island Region: Near predicted monthly values during local day. Depressed by 30% 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: Depressed by 15% during local day. Near predicted monthly values local night. Antarctic Region (Casey/Davis/Mawson): Depressed by 30% over the UT day. Monthly T index: Month T index Mar 92 Apr 83 May 81

Ionospheric Forecast

(last updated 11 Apr 2026 23:30 UT)

Date T index MUFs 12 Apr 75 Depressed 10 to 15%/near predicted monthly values 13 Apr 90 Near predicted monthly values 14 Apr 90 Near predicted monthly values COMMENT: Maximum Usable Frequencies (MUFs) in the Australian region were 15-20% depressed to near predicted monthly values on 11-Apr. Spread F was observed at Hobart during local night hours. MUFs are generally expected to be near predicted monthly values over 12-14 Apr, with mild depressions possible for the southern Australian region on 12-Apr.