Ionospheric Summary and Forecast

Ionospheric Summary

(last updated 29 Jun 2026 23:30 UT)

Date T index 29 Jun 75 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. Northern Australian Region: Near predicted monthly values. Southern Australian Region: Near predicted monthly values. Antarctic Region (Casey/Davis/Mawson): Enhanced by 20% over the UT day. Monthly T index: Month T index May 67 Jun 68 Jul 65

Ionospheric Forecast

(last updated 29 Jun 2026 23:30 UT)

Date T index MUFs 30 Jun 80 Near predicted monthly values 01 Jul 70 Depressed 10 to 15%/near predicted monthly values 02 Jul 80 Near predicted monthly values COMMENT: ASWFC SWF HF Communications Warning 58 was issued on 29 June and is current for 29-30 Jun. Maximum usable frequencies (MUFs) in the Australian region on UT day 29-Jun were mostly near predicted monthly values. Sporadic-A was observed in Perth during local dawn hours. MUFs are expected to be near predicted values on 30-Jun, may briefly become depressed during local dawn hours by 10-15% on 1-Jul, returning to normal by 2-Jul.