Ionospheric Summary and Forecast

Ionospheric Summary

(last updated 09 Jun 2026 23:42 UT)

Date T index 09 Jun 68 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 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 May 67 Jun 68 Jul 65

Ionospheric Forecast

(last updated 09 Jun 2026 23:42 UT)

Date T index MUFs 10 Jun 75 Near predicted monthly values 11 Jun 70 Near predicted monthly values 12 Jun 60 Near predicted monthly values COMMENT: ASWFC Preliminary HF Communications Warning 53 was issued on 6 June and is current for 8-10 Jun. Maximum usable frequencies (MUFs) in the Australian region were near predicted monthly values. Spread F was observed at Hobart and Canberra during local night hours. MUFs are expected to be mostly near predicted monthly values over 10-12 Jun, with a chance of depressions on 11-12 Jun if geomagnetic activity eventuates following the arrival of a coronal hole high speed wind stream on 11-Jun.