Ionospheric Summary and Forecast

Ionospheric Summary

(last updated 08 Jul 2025 23:32 UT)

Date T index 08 Jul 79 Observed Australian Regional MUFs Cocos Island Region: Near predicted monthly values during local day. Depressed by 40% during local night. Depressed by 25% after local dawn. Niue Island Region: Depressed by 15% during local day. Depressed by 35% during local night. Northern Australian Region: Near predicted monthly values during local day. Depressed by 35% during local night. Southern Australian Region: Near predicted monthly values. Antarctic Region (Casey/Davis/Mawson): Depressed by 25% over the UT day. Monthly T index: Month T index Jun 79 Jul 104 Aug 102

Ionospheric Forecast

(last updated 08 Jul 2025 23:32 UT)

Date T index MUFs 09 Jul 80 Depressed 15 to 20%/near predicted monthly values 10 Jul 80 Depressed 15 to 20%/near predicted monthly values 11 Jul 80 Depressed 15 to 20%/near predicted monthly values COMMENT: Maximum usable frequencies (MUFs) in the Australian region on UT day 8-Jul were depressed 35% to near predicted values, with depressed conditions during local night hours for the northern Australian region. Spread-F was observed at Townsville, Learmonth, Hobart during local night hours. Blanketing sporadic E observed at Casey and Mawson in Antarctica. MUFs are expected to be generally depressed 15-20% to near predicted values MUFs over 9-11 Jul. Isolated minor shortwave fadeouts are possible.