Ionospheric Summary and Forecast

Ionospheric Summary

(last updated 30 Oct 2026 23:30 UT)

Date T index 30 Oct 43 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. Depressed by 25% 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 Sep 61 Oct 60 Nov 58

Ionospheric Forecast

(last updated 30 Oct 2026 23:30 UT)

Date T index MUFs 31 Oct 35 Depressed 15%/near predicted monthly values 01 Nov 35 Depressed 15%/near predicted monthly values 02 Nov 40 Near predicted monthly values COMMENT: ASWFC HF Communications Warning 99 was issued on 29 October and is current for 29-31 Oct. Maximum Usable Frequencies (MUFs) in the northern Australian region on UT day 30-Oct were mostly near predicted monthly values, with some small periods of mild depressions across the region. Spread F was observed at Hobart during local night hours. MUFs are forecast to be near predicted monthly values to 15% depressed over 31-Oct to 01-Nov due to expected geomagnetic activity. MUFs are expected to be near predicted monthly values on 02-Nov.