Ionospheric Summary and Forecast

Ionospheric Summary

(last updated 30 Apr 2025 23:30 UT)

Date T index 30 Apr 119 Observed Australian Regional MUFs Cocos Island Region: Near predicted monthly values during local day. Enhanced by 60% during local night. Niue Island Region: Near predicted monthly values during local day. Depressed by 20% 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 Mar 126 Apr 115 May 113

Ionospheric Forecast

(last updated 30 Apr 2025 23:30 UT)

Date T index MUFs 01 May 115 Near predicted monthly values 02 May 115 Near predicted monthly values 03 May 115 Near predicted monthly values COMMENT: ASWFC SWF HF Communications Warning 42 was issued on 29 April and is current for 29 Apr to 1 May. Maximum usable frequencies (MUFs) in the Australian region on UT day 30-Apr were near predicted monthly values. Spread F was observed at Hobart during local night hours. MUFs are expected to be near predicted monthly values over 01-03 May. Southern Australian region HF conditions may become mildly degraded during local night hours over the forecast period. Shortwave fadeouts are possible.