[Ips-hf-warning] ASWFC HF DEPRESSION WARNING issued 2231 UT on 26 Mar 2025 [SEC=OFFICIAL]

[Australian Space Weather Forecasting Centre]

SUBJ: ASWFC HF RADIO COMMUNICATIONS WARNING 25/31
ISSUED AT 2227UT/26 MARCH 2025
BY THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE.

Southern Australian region MUFs were depressed by 20% on 26-Mar. 
Further depressed conditions are expected for the southern Australian 
region on 27-Mar. Northern Australian region MUFs are currently 
near predicted monthly values to 15% enhanced. The middle to 
high latitude ionospheric depression is due to increased geomagnetic 
activity induced by a coronal hole wind stream.

DEGRADED HF PROPAGATION CONDITIONS EXPECTED
FOR 27 MARCH 2025 FOR SOUTHERN AUS/NZ REGION ONLY.
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
_____________________________________________________________
27 Mar:   70   -15%/normal      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