Ionospheric Summary and Forecast

Ionospheric Summary

(last updated 27 Oct 2025 23:30 UT)

Date T index 27 Oct 118 Observed Australian Regional MUFs Cocos Island Region: Near predicted monthly values during local day. Enhanced by 35% during local night. Niue Island Region: Near predicted monthly values during local day. Enhanced by 20% during local night. Northern Australian Region: Near predicted monthly values during local day. Enhanced by 20% during local night. Southern Australian Region: Near predicted monthly values during local day. Enhanced by 15% during local night. Antarctic Region (Casey/Davis/Mawson): Near predicted monthly values over the UT day. Monthly T index: Month T index Sep 109 Oct 89 Nov 89

Ionospheric Forecast

(last updated 27 Oct 2025 23:30 UT)

Date T index MUFs 28 Oct 90 Near predicted monthly values 29 Oct 60 Depressed 15%/near predicted monthly values 30 Oct 75 Near predicted monthly values COMMENT: Maximum usable frequencies (MUFs) in the Australian region on UT day 27-Oct were near predicted monthly values in the Australian region throughout local day, with enhancements of 15% in the Southern Australian region at local night. Enhancements of 20% were seen in the Northern Australian region during local night. MUFs are expected to be near monthly predicted values on 28-Oct & 30-Oct and up to 15% depressed on 29-Oct due to anticipated high speed wind stream effects from a coronal hole.