Ionospheric Summary and Forecast

Ionospheric Summary

(last updated 25 Jul 2025 23:32 UT)

Date T index 25 Jul 105 Observed Australian Regional MUFs Cocos Island Region: Enhanced by 30% during local day. Near predicted monthly values during local night. Niue Island Region: Near predicted monthly values during local day. Depressed by 15% during local night. Northern Australian Region: Mostly near predicted monthly values. Depressed by 20% after local dawn. Southern Australian Region: Mostly near predicted monthly values. Antarctic Region (Casey/Davis/Mawson): Near predicted monthly values over the UT day. Monthly T index: Month T index Jun 79 Jul 104 Aug 102

Ionospheric Forecast

(last updated 25 Jul 2025 23:32 UT)

Date T index MUFs 26 Jul 95 Near predicted monthly values to 15% depressed 27 Jul 95 Near predicted monthly values to 15% depressed 28 Jul 95 Near predicted monthly values to 15% depressed COMMENT: Maximum usable frequencies (MUFs) in the Australian region on UT day 25-Jul were near predicted values to 20% depressed. Conditions in Hobart during local night hours were degraded. Scintillation was observed at Weipa from 1444 to 1459 UT. MUFs are expected to be near predicted values over 26-28 Jul, with some brief depressions during local night hours.