Ionospheric Summary and Forecast
Ionospheric Summary
(last updated 20 Jul 2026 23:30 UT)
Date T index 20 Jul 67 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 during local day. Depressed by 15% during local night. 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 81 Jul 66 Aug 63
Ionospheric Forecast
(last updated 20 Jul 2026 23:30 UT)
Date T index MUFs 21 Jul 65 Near predicted monthly values 22 Jul 45 Depressed 15%/near predicted monthly values 23 Jul 55 Depressed 10%/near predicted monthly values COMMENT: Maximum Usable Frequencies (MUFs) in the Australian region on UT day 20-Jul were near predicted monthly values, with overnight depressions up to 15% observed in the northern Australian region. Spread-F was observed across the Australian region during local night hours, with strong spread-F observed in Hobart, Perth, Learmonth, and Townsville. Sporadic E was also observed in Learmonth during local night hours. MUFs are forecast to be near predicted monthly values on 21-Jul, with some depressions possible during local night hours. MUFs are forecast to be up to 15% depressed on 22-Jul due to anticipated geomagnetic activity, with depressions of up to 10% possible on 23-Jul as geomagnetic activity continues. Shortwave fadeouts are possible.
