Ionospheric Summary and Forecast

Ionospheric Summary

(last updated 01 Jul 2026 23:36 UT)

Date T index 01 Jul 102 Observed Australian Regional MUFs Cocos Island Region: No data available during local day. No data available during local night. Niue Island Region: Mostly near predicted monthly values. Enhanced by 30% after local dawn. Northern Australian Region: Enhanced by 25% during local day. Near predicted monthly values during local night. Southern Australian Region: Enhanced by 20% during local day. Enhanced by 20% during local night. Enhanced by 25% after local dawn. Antarctic Region (Casey/Davis/Mawson): Near predicted monthly values over the UT day. Monthly T index: Month T index Jun 81 Jul 66 Aug 63

Ionospheric Forecast

(last updated 01 Jul 2026 23:36 UT)

Date T index MUFs 02 Jul 90 Near predicted monthly values 03 Jul 60 Depressed 15 to 20%/near predicted monthly values 04 Jul 70 Depressed 10 to 15%/near predicted monthly values COMMENT: ASWFC SWF HF Communications Warning 60 was issued on 30 June and is current for 1-2 Jul. Maximum Usable Frequencies (MUFs) in the Australian region were enhanced over UT day 01-Jul, with enhancements of 20-30% reported across the region. Spread-F was also present across most of the Australian region during local night hours, including significant spread-F at Hobart. MUFs are expected to be near predicted values on 02-Jul, with some enhancements possible. MUFs are forecast to become 15-20% depressed on 03-04 Jul due to the arrival of a CME first observed on 30-Jun. Shortwave fadeouts are probable.