[Ips-hf-warning] ASWFC HF DEPRESSION WARNING issued 0011 UT on 22 Apr 2026 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC HF RADIO COMMUNICATIONS WARNING 26/39
ISSUED AT 0011UT/22 APRIL 2026
BY THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE.

Due to recent geomagnetic activity, maximum usable frequencies 
in the Australian region have been depressed by up to 40%. Further 
depressions may continue into 22-Apr by up to 20%, although recovering 
by the end of the day.

DEGRADED HF PROPAGATION CONDITIONS EXPECTED
FOR 22 APRIL 2026
IF COMMS DIFFICULTIES EXPERIENCED TRY A LOWER FREQUENCY BAND
_____________________________________________________________

HF COMMUNICATIONS FORECAST (AUSTRALIAN/NEW ZEALAND REGION)
                                   FREQUENCY BANDS
       T-index      MUFs        2  4  6  8 12 16 22 26
_____________________________________________________________
22 Apr:   40   -20%/normal      2  4  6  6  8 12 16 16

Australian Space Weather Forecasting Centre
Bureau of Meteorology
ASWFC at bom.gov.au
www.bom.gov.au | www.sws.bom.gov.au