Ionospheric Summary and Forecast

Ionospheric Summary

(last updated 18 Apr 2024 23:30 UT)

Date T index 18 Apr 133 Observed Australian Regional MUFs Cocos Island Region: Near predicted monthly values during local day. Enhanced by 85% during local night. Niue Island Region: Near predicted monthly values during local day. Enhanced by 35% during local night. Northern Australian Region: Near predicted monthly values during local day. Enhanced by 35% during local night. Southern Australian Region: Near predicted monthly values. Antarctic Region (Casey/Davis/Mawson): Near predicted monthly values over the UT day. Monthly T index: Month T index Mar 120 Apr 114 May 115

Ionospheric Forecast

(last updated 18 Apr 2024 23:30 UT)

Date T index MUFs 19 Apr 135 Near to 15% above predicted monthly values 20 Apr 135 Near to 15% above predicted monthly values 21 Apr 135 Near to 15% above predicted monthly values COMMENT: ASWFC SWF HF Communications Warning 37 was issued on 18 April and is current for 18-20 Apr. Maximum usable frequencies (MUFs) in the Australian region on UT day 18-Apr were near predicted monthly values, with enhanced conditions observed at Darwin during local night. Long periods of spread F were observed at Canberra during local night. MUFs are expected to be near predicted monthly values to 15% enhanced over 19-21 Apr, with a chance of mild depressions in the southern Australian region over 20-21 Apr due to possible geomagnetic activity on 20-Apr. Shortwave fadeouts are probable.