[Ips-hf-warning] ASWFC HF DEPRESSION WARNING issued 2220 UT on 19 Apr 2026 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC HF RADIO COMMUNICATIONS WARNING 26/37
ISSUED AT 2220UT/19 APRIL 2026
BY THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE.

Maximum Usable Frequencies (MUFs) are depressed by up to 30% 
due to geomagnetic activity induced by a coronal hole high speed 
wind stream. MUFs are expected to be depressed over the next 
UT day.

DEGRADED HF PROPAGATION CONDITIONS EXPECTED
FROM 19-20 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
_____________________________________________________________
19 Apr:   40          -30%      2  4  6  8  8 12 16 16
20 Apr:   50          -20%      2  4  6  8 12 12 16 22

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