Ionospheric Summary and Forecast

Ionospheric Summary

(last updated 28 May 2026 23:30 UT)

Date T index 28 May 88 Observed Australian Regional MUFs Cocos Island Region: No data available during local day. No data available during local night. Niue Island Region: Near predicted monthly values during local day. Enhanced by 25% during local night. Enhanced by 25% after local dawn. Northern Australian Region: Near predicted monthly values. Southern Australian Region: Near predicted monthly values during local day. Enhanced by 20% during local night. Antarctic Region (Casey/Davis/Mawson): Near predicted monthly values over the UT day. Monthly T index: Month T index Apr 74 May 71 Jun 68

Ionospheric Forecast

(last updated 28 May 2026 23:30 UT)

Date T index MUFs 29 May 85 Near predicted monthly values 30 May 75 Near predicted monthly values 31 May 80 Near predicted monthly values COMMENT: Maximum Usable Frequencies (MUFs) in the Australian region were near predicted monthly values to 20% enhanced on UT day 28-May. Spread-F was observed at Hobart during local night hours. Ionospheric scintillation was observed at Niue Island over the interval 28/0907-0925UT. MUFs are expected to be near predicted monthly values over 29-31 May.