Ionospheric Summary and Forecast
Ionospheric Summary
(last updated 16 Jan 2026 23:30 UT)
Date T index 16 Jan 83 Observed Australian Regional MUFs Cocos Island Region: Near predicted monthly values during local day. Enhanced by 15% during local night. Niue Island Region: Mostly near predicted monthly values. Northern Australian Region: Near predicted monthly values. Southern Australian Region: Near predicted monthly values. Antarctic Region (Casey/Davis/Mawson): Depressed by 20% over the UT day. Monthly T index: Month T index Dec 110 Jan 89 Feb 88
Ionospheric Forecast
(last updated 16 Jan 2026 23:30 UT)
Date T index MUFs 17 Jan 85 Near predicted monthly values 18 Jan 75 Depressed 10 to 15%/near predicted monthly values 19 Jan 70 Depressed 10 to 15%/near predicted monthly values COMMENT: ASWFC SWF HF Communications Warning 9 was issued on 15 January and is current for 15-17 Jan. Maximum Usable Frequencies (MUFs) in the Australian region were near predicted monthly values during UT day 16-Jan. Some enhancements were observed in the Cocos Islands, while depressions were observed in the Antarctic region. Mild sporadic E was observed in the southern Australian region, and some mild spread F was reported during local night hours in Hobart. MUFs are expected to remain near predicted monthly values over 17-Jan, but are forecast to become depressed by 10-15% on 18-19 Jan due to geomagnetic activity associated with a coronal hole high‑speed wind stream. Shortwave fadeouts and sporadic-E are possible.
