Ionospheric Summary and Forecast

Ionospheric Summary

(last updated 05 May 2025 23:31 UT)

Date T index 05 May 108 Observed Australian Regional MUFs Cocos Island Region: Near predicted monthly values during local day. Depressed by 25% during local night. Niue Island Region: Near predicted monthly values during local day. Depressed by 20% during local night. Northern Australian Region: Enhanced by 15% during local day. Near predicted monthly values during local night. Southern Australian Region: Near predicted monthly values during local day. Depressed by 20% during local night. Antarctic Region (Casey/Davis/Mawson): Depressed by 25% over the UT day. Monthly T index: Month T index Apr 123 May 113 Jun 111

Ionospheric Forecast

(last updated 05 May 2025 23:31 UT)

Date T index MUFs 06 May 95 Near predicted monthly values 07 May 95 Near predicted monthly values 08 May 95 Near predicted monthly values COMMENT: ASWFC SWF HF Communications Warning 44 was issued on 5 May and is current for 5-7 May. Maximum usable frequencies (MUFs) in the Australian region on UT day 05-May were mostly near predicted monthly values, with depressions of 20% observed in southern Australia during local night. Spread F was observed at Hobart and Canberra during local night hours. MUFs are expected to be near predicted monthly values over 06-08 May. There is a chance of mild depressions in the southern Australian region over the forecast period due to expected geomagnetic activity. Minor shortwave fadeouts are possible.