Ionospheric Summary and Forecast

Ionospheric Summary

(last updated 14 Sep 2024 23:30 UT)

Date T index 14 Sep 120 Observed Australian Regional MUFs Cocos Island Region: Enhanced by 25% during local day. Enhanced by 40% during local night. Niue Island Region: Enhanced by 25% during local day. Near predicted monthly values during local night. Northern Australian Region: Mostly near predicted monthly values. Southern Australian Region: Depressed by 30% during local day. Near predicted monthly values during local night. Antarctic Region (Casey/Davis/Mawson): Depressed by 20% over the UT day. Monthly T index: Month T index Aug 159 Sep 117 Oct 116

Ionospheric Forecast

(last updated 14 Sep 2024 23:30 UT)

Date T index MUFs 15 Sep 130 Near predicted monthly values 16 Sep 100 Depressed 5 to 15%/near predicted monthly values 17 Sep 120 Near predicted monthly values COMMENT: ASWFC SWF HF Communications Warning 101 was issued on 13 September and is current for 13-15 Sep. Maximum usable frequencies (MUFs) in the northern Australian region on UT day 14-Sep were near predicted monthly values. MUFs in the southern Australian region were near predicted monthly values to depressed by up to 30%, with the strongest depressions observed during local daylight hours. Spread F was observed at Hobart, Perth and Canberra. MUFs are expected to be near predicted monthly values on 15-Sep, with depressions possible in the southern Australian region. Significant depressions, especially at high latitudes, are expected on 16-Sep due to anticipated geomagnetic activity. MUFs are expected to be in recovery towards predicted monthly values on 17-Sep.