Ionospheric Summary and Forecast

Ionospheric Summary

(last updated 20 Mar 2025 23:31 UT)

Date T index 20 Mar 135 Observed Australian Regional MUFs Cocos Island Region: Near predicted monthly values during local day. Enhanced by 20% during local night. Enhanced by 20% after local dawn. Niue Island Region: Enhanced by 15% during local day. Enhanced by 20% during local night. Northern Australian Region: Near predicted monthly values during local day. Enhanced by 15% during local night. Southern Australian Region: Mostly near predicted monthly values. Antarctic Region (Casey/Davis/Mawson): Depressed by 15% over the UT day. Monthly T index: Month T index Feb 127 Mar 117 Apr 114

Ionospheric Forecast

(last updated 20 Mar 2025 23:31 UT)

Date T index MUFs 21 Mar 130 Near predicted values to 15% enhanced 22 Mar 125 Near predicted monthly values to 15% enhanced 23 Mar 110 Near predicted monthly values to 15% depressed COMMENT: Maximum usable frequencies (MUFs) in the Australian region on UT day 20-Mar were near predicted values to 15% enhanced. Some minor spread-F was observed in Hobart. Scintillation was observed in Darwin and Weipa from 1115 UT to 1310 UT with a maximum S4 index of 1.0. MUFs are expected to be near predicted values to 15% enhanced over 21-22 Mar; MUFs may become depressed by 15% by 23-Mar. Equatorial scintillation is likely.